basl2c(1B)

NAME
basl2c - converts a BASL (BAtch Scheduling Language) code into a C scheduler code.

SYNOPSIS
basl2c [-d] [-l lexerDebugFile] [-p parserDebugFile] [-y symtabDebugFile] [-s semanticDebugFile] [-g codegenDebugFile] [-c cFile] baslFile

DESCRIPTION
basl2c is the BASL to C compiler that produces an intermediate code that can be fed into a regular C compiler, and linked with the PBS libraries to produce the scheduler executable. Basl2c takes as input a which is a program written in the BAtch Scheduling Language, containing the main scheduling code. Basl2c then converts the BASL constructs in the file into C statements, and it also attaches additional code to produce the PBS scheduler source code. By default, the resulting C code is written into the file

The full pathname to the resulting C file is what needs to be specified in the SCHD_CODE variable in local.mk before compiling the BASL scheduler to produce the executable.

OPTIONS

-d  Prints additional debugging messages to the lexer (see -l option), parser (see -p option), symbol table (see -y option), semantic analyzer (see -s option), and code generator (see -g option).

-l lexerDebugFile
    is the name of a file to write into the debugging messages generated while scanning for tokens.

-p parserDebugFile
    is the name of a file to write into the debugging messages generated while putting together tokens in a usable way.

-y symtabDebugFile
    is the name of a file to write into the debugging messages related to the symbol table.

-s semanticDebugFile
    is the name of a file to write into the debugging messages generated while checking to make sure variables and operators are used in a consistent way.

-g codegenDebugFile
    is the name of a file to write into the debugging messages generated while converting BASL statements to C statements.

-c cFile
    is the name of a file where the generated C code is written into.

MAIN STRUCTURE
The basic structure of a scheduler code written in BASL is as follows:
        zero or more FUNCTIONS definitions
        zero or more global VARIABLE DECLARATIONS
        zero or more assignment statements (to initialize global variables)
        sched_main()
        {
                one or more VARIABLE DECLARATIONS
                zero or more STATEMENTS
        }

For example,
        % cat sched.basl
        Int sum(Int a, Int b)
        {
                Int s;
                s = a + b;
                return(s);
        }
	Int glob;
        sched_main()
        {
                Int c;
                a = 3;
                b = 4;
                c = sum(a, b);
                print(c);
		glob = 5;
		print(glob);
        }

is the function that gets called at every scheduling iteration.

FUNCTIONS
To define a function that can be called in subsequent functions, the syntax is:

    ReturnType function-name ( DATATYPE1 IDENTIFIER1,
                               DATATYPE2 IDENTIFIER2, ... )
        {
                one or more VARIABLE DECLARATIONS
                zero or more STATEMENTS
        }

For example,
    Void printStuff(Dayofweek dow, DateTime t, String str,
                                         Size sz, CNode cn)
    {
        print(dow);
        print(t);
        print(str);
        print(sz);
        print(cn);
    }

Valid function ReturnType are: Void, Int, Float, Dayofweek, DateTime, String, Size, Server, Que, Job, CNode, Set Server, Set Que, Set Job, Set CNode.

Valid data types ( DATATYPE1, DATATYPE2, ... ) for the parameter identifiers are: Int, Float, Dayofweek, DateTime, String, Size, Server, Que, Job, CNode, Set Server, Set Que, Set Job, Set CNode, Range Int, Range Float, Range Dayofweek, Range DateTime, Range Size, Fun Int, Fun Float, Fun Void, Fun Dayofweek, Fun DateTime, Fun String, Fun Size, Fun Server, Fun Que, Fun Job, Fun CNode, Fun Set Server, Fun Set Que, Fun Set Job, Fun Set CNode. These data types will be discussed in the next topic.

Functions are invoked by their name and their arguments as in:

        printStuff( MON, (5|1|1997@14:32:00), "sched begins",
                                                 30gb, node );

will actually add a "basl_" prefix to the function name given by the scheduler writer to minimize chance of name collision, which can result when the resulting C code is linked with the PBS, BASL libraries. For example, if you look at the generated C code for you would see,

        basl_printStuff( MON, (5|1|1997@14:32:00),
                                 "sched begins", 30gb, node );

As in C, all function calls must have been previously defined. The BASL compiler will check to make sure that arguments in the function call match up exactly (in terms of types) with the parameters in the function definition.

Two kinds of functions exist in BASL: user-defined functions and predefined functions. User-defined functions are those that the scheduler writer provided a definition for, while predefined functions are those that can immediately be called without a need for defining it. For a list of predefined functions, see section on PREDEFINED FUNCTIONS .

VARIABLE DECLARATIONS
Like in C, all variables in a BASL code must be explicitly declared before use. Those variables declared outside of any function are referred to as global variables, while variables that are declared within a function body are called local variables. Global variables are usable anywhere within the BASL code, while local variables are readable only within the function from which they were declared.

The syntax of a variable declaration is:

        DATATYPE IDENTIFIER ;

where DATATYPE can be: Int, Float, Dayofweek, DateTime, String, Size, Server, Que, Job, CNode, Set Server, Set Que, Set Job, Set CNode, Range Int, Range Float, Range Dayofweek, Range DateTime, Range Size.

DATA TYPE

Void
    used for functions that don't return a value.

Int signed, whole numbers given in base 10.

    Sample constants:
        5, +1, -3, SUCCESS (=1), FAIL (=0), TRUE (=1), FALSE (=0)

Float
    real numbers which are represented as doubles in the translated C code.
    Sample constants: 4.3, +1.2, -2.6

Dayofweek
    constant values: SUN, MON, TUE, WED, THU, FRI, SAT, internally represented as integer valued constants with SUN=0, MON=1, and so on.

DateTime
    specify in one of 3 formats:

    [1] (m|d|y) where 1 <= m <= 12, 1 <= d <= 31, 0 <= y, ex. (4|4|1997);

    [2] (hh:mm:ss) where 0 <= hh <= 23, 0 <= mm <= 59, 0 <= ss <= 61, ex. (12:01:00);

    [3] (m|d|y@hh:mm:ss), ex. (4|4|1997@12:01:00)
        During dates/times comparison, "now" time is substituted if the time portion is not given (format [1]); the "now" date is substituted if the date portion is not given (format [2]). Also, the full year portion must be given (i.e. 1997 instead of 97) in dates to avoid ambiguity.

String
    A string is enclosed in quotes (") and it can contain anything except another quote, a newline, and left and right parentheses.
    Sample constants: "a sample string", NULLSTR

Size
    format: <integer><suffix> where suffix is a multiplier of the form: <multiplier><unit>:

       multiplier              unit (bytes or words)
       ===================     =====================
       k,m,g,t,p,K,M,G,T,P     b,B,w,W

    where k=K=1024, m=M=1,048,576, g=G=1,073,741,824, t=T=1,099,511,627,776, p=P=1,125,899,906,842,624, b=B=1, and word size w=W is locally defined (i.e. 4 bytes in a 32-bit machine).

    When operating on 2 size operands that are of different suffixes, the suffix of the "lower" of the two will be the resultant suffix. For example,
         10mb + 10gb =  10250mb
    Sample constants: -1b, 2w, 1kb, 2mw, +3gb, 4tw, 6Pb

Range Int

    format: (low Int value, high Int value)
        where low Int value <= high Int value. Sample constant: (1,3)

Range Float

    format: (low Float value, high Float value)
        where low value <= high value. Sample constant: (2.3, 4.6)

Range Dayofweek

    format: (earlier day, later day)
        where earlier day <= later day. Sample constant: (WED, FRI)

Range DateTime

    format: (earlier date/time, later date/time)
        where earlier date/time <= later date/time.
        NOTE: if range contains only time portions, and earlier time "appears" to be > later time as in "((18:0:0), (6:0:0))", then during date/time comparisons, the "later" time will be adjusted by one day so that it will look like: "( (<now date>@18:0:0), (<tomorrow date>@6:0:0) )"

    Sample constants:
        ((4|4|1997), (4|10|1997)), ((12:01:00), (12:30:00)), ((4|4|1997@12:01:00), (4|10|1997@12:30:00))

Range Size

    format: (low size, high size)
        where low size <= high size. Sample constants: (23gb, 50gb)

Server
    Maps directly to the PBS server object. A Server manages one or more Que objects.
    Sample constant: NOSERVER

CNode
    for computational node consisting of a single OS image, a shared memory, and a set of cpus. CNode runs 1 PBS MOM.
    Sample constant: NOCNODE

Que Maps directly to the PBS queue object. A Que object spools one or more Job objects.
    Sample constant: NOQUE

Job Maps directly to the PBS job object. A Job object carries some attributes and resource requirements.
    Sample constant: NOJOB

Set Server
    list of Server objects.
    Sample constant: EMPTYSETSERVER

Set CNode
    list of CNode objects.
    Sample constant: EMPTYSETCNODE

Set Que
    list of Que objects.
    Sample constant: EMPTYSETQUE

Set Job
    list of Job objects.
    Sample constant: EMPTYSETJOB

BASL-DEFINED CONSTANTS
These are constants that cannot be used for naming an identifier (see next topic). These are always in uppercase.

   DATA TYPE               BASL-DEFINED CONSTANT
   ===================     =============================================
   Dayofweek               SUN, MON, TUE, WED, THU, FRI, SAT
   Int                     SUCCESS, FAIL, FALSE, TRUE, SYNCRUN, ASYNCRUN,
                           DELETE, RERUN, HOLD, RELEASE, SIGNAL,
                           MODIFYATTR, MODIFYRES, SERVER_ACTIVE,
                           SERVER_IDLE, SERVER_SCHED, SERVER_TERM,
                           SERVER_TERMDELAY, QTYPE_E, QTYPE_R,
                           SCHED_DISABLED, SCHED_ENABLED, TRANSIT,
                           QUEUED, HELD, WAITING, RUNNING, EXITING,
                           CNODE_OFFLINE, CNODE_DOWN, CNODE_FREE,
                           CNODE_RESERVE, CNODE_INUSE_EXCLUSIVE,
                           CNODE_INUSE_SHARED, CNODE_TIMESHARED,
                           CNODE_CLUSTER, CNODE_UNKNOWN, OP_EQ, OP_NEQ,
                           OP_LE, OP_LT, OP_GE, OP_GT, OP_MAX, OP_MIN,
                           ASC, DESC
   Server                  NOSERVER
   Set Server              EMPTYSETSERVER
   CNode                   NOCNODE
   Set CNode               EMPTYSETCNODE
   Que                     NOQUE
   Set Que                 EMPTYSETQUE
   Job                     NOJOB
   Set Job                 EMPTYSETJOB
   String                  NULLSTR

IDENTIFIER
Identifiers (used for variable names and function names) are in alphanumeric format, with the special underscore (_) character allowed. Currently, BASL can only handle identifiers with length of up to 80 chars. Also, you cannot use the BASL-defined constant names for naming an identifier.

STATEMENTS
In BASL(2), you can have a single statement terminated by a semi-colon, or a group of statements (called compound statement or block) delimited by '{' and '}'. The different kinds of statements that can appear in a BASL code are:

    1. expression statement
        Expression statements are anything of the form:

                expr ;

        where expr can be:

        a)  Arithmetic expressions

                    lexpr + rexpr   (add)
                    lexpr - rexpr   (subtract)
                    lexpr * rexpr   (multiply)
                    lexpr / rexpr   (divide)
                    lexpr % rexpr   (modulus or remainder)

            NOTE: Adding, subtracting, multiplying, dividing, and remaindering will only be allowed for proper types and if the left and right expressions are of consistent types. The table below illustrates what types are consistent among the various operators:

            For +:

                    lexpr          rexpr
                    ============   ============
                    Int or Float   Int or Float
                    Size           Size
                    String         String

            For -, *, /:

                    lexpr          rexpr
                    ============   ============
                    Int or Float   Int or Float
                    Size           Size

            For %:

                    lexpr          rexpr
                    ============   ============
                    Int or Float   Int or Float

            Here are some sample arithmetic expressions statements:
                    Int     i1;
                    Int     i2;
                    Float   f1;
                    Float   f2;
                    Size    sz1;
                    Size    sz2;
                    String  str1;
                    String  str2;
                    i1 + i2;
                    f1 - i2;
                    sz1 * sz2 * 2b;
                    sz1 / 1024b;
                    str1 = "basl";
                    str2 = " cool";
                    // the following is a string concatenation
                    // operation resulting in the string:
                    //      "basl cool"
                    str1 + str2;
                    i1 % 10;

        b)  Unary expressions

                    +expr     // positive - multiplies by 1 an
                                  //        expression that is
                                  //        of Int, Float, or
                                  //        Size type
                    -expr     // negative - multiplies by -1 an
                                  //        expression that is
                                  //        of Int, Float, or
                                  //        Size type
                    !expr     // not - converts a non-zero expr
                                  //       value into 0, and a
                                  //       zero expr value into 1
                                  //       where expr type must be
                                  //       of type Int or Float

            Some sample unary expressions:
                    Int i;
                    +3;
                    -(i + 4);
                    !i;

        c)  Logical expressions

                    lexpr EQ  rexpr
                    lexpr NEQ rexpr
                    lexpr LT  rexpr
                    lexpr LE  rexpr
                    lexpr GT  rexpr
                    lexpr GE  rexpr
                    lexpr AND rexpr
                    lexpr OR  rexpr

            lexpr and rexpr must have types that are mutually consistent as shown in the following table:

                    lterminal-expr   rterminal-expr
                    ==============   ==============
                    Int or Float     Int or Float
                    Dayofweek        Dayofweek
                    DateTime         DateTime
                    String           String
                    Size             Size
                    Server           Server
                    Que              Que
                    Job              Job
                    CNode            CNode
                    Set Server       Set Server
                    Set Que          Set Que
                    Set Job          Set Job
                    Set CNode        Set CNode

            For AND, OR operators, the lexpr, rexpr consistent types are Int or Float.

            Some sample logical expressions:
                    i1 EQ  i2;
                    i1 NEQ f2;
                    dow1 LE dow2;
                    d1 LT d2;
                    str1 GT str2;
                    sz1 GE sz2;

        d)  Post-operator expressions
            These are expressions that are merely shortcut to assignment statements.

                    IDENTIFIER++;    // identifier=identifier+1
                    IDENTIFIER--;     // identifier=identifier-1

            IDENTIFIER must be of Int or Float type.

            Example:
                     Int i;
                     Float f;
                     i++;
                     f--;

        e)  Function call

                    function-name ( arg1 ,arg2 ... , argN )

            where arg1, ..., argN can be any constant or variable. You can't have another function call as an argument.
            Example:
                    Void pr(Int a) {
                            print(a);
                    }
                    pr(5);

            There are certain predefined functions that a scheduler writer can automatically call in his/her BASL code without a need to define it. These functions are referred to as assist functions (or helper functions) and they are discussed under PREDEFINED FUNCTIONS topic.

        f)  Constants
            Some valid constant expressions are given in the following:
                    5;
                    +1.2;
                    SUN;
                    MON;
                    TUE;
                    WED;
                    THU;
                    FRI;
                    SAT;
                    (4|4|1997);
                    (12:01:00);
                    (4|4|1997@12:01:00);
                    "wonderful";
                    -1b;
                    SYNCRUN;
                    ASYNCRUN;
                    DELETE;
                    RERUN;
                    HOLD;
                    RELEASE;
                    SIGNAL;
                    MODIFYATTR;
                    MODIFYRES;
                    (1, 3);
                    (2.3, 4.6);
                    (WED, FRI);
                    ((4|4|1997), (4|10|1997));
                    ((12:01:00), (12:30:00));
                    ((4|4|1997@12:01:00), (4|10|1997@12:30:00));
                    (23gb, 50gb);
                    NOSERVER;
                    NOCNODE;
                    NOQUE;
                    NOJOB;
                    EMPTYSETSERVER;
                    EMPTYSETCNODE;
                    EMPTYSETQUE;
                    EMPTYSETJOB;
                    NULLSTR;
                    SUCCESS;
                    FAIL;
                    SERVER_ACTIVE;
                    SERVER_IDLE;
                    SERVER_SCHED;
                    SERVER_TERM;
                    SERVER_TERMDELAY;
                    QTYPE_E;
                    QTYPE_R;
                    SCHED_DISABLED;
                    SCHED_ENABLED;
                    FALSE;
                    TRUE;
                    TRANSIT;
                    QUEUED;
                    HELD;
                    WAITING;
                    RUNNING;
                    EXITING;
                    CNODE_OFFLINE;
                    CNODE_DOWN;
                    CNODE_FREE;
                    CNODE_RESERVE;
                    CNODE_INUSE_EXCLUSIVE;
                    CNODE_INUSE_SHARED;
                    CNODE_TIMESHARED;
                    CNODE_CLUSTER;
                    CNODE_UNKNOWN;
                    OP_EQ;
                    OP_NEQ;
                    OP_LE;
                    OP_LT;
                    OP_GE;
                    OP_GT;
                    OP_MAX;
                    OP_MIN;

        g)  Identifier

            Example:
                    Int i;
                    i;

    2. Assignment statement

                IDENTIFIER = expr ;

        IDENTIFIER and expr must have types that are mutually consistent as illustrated in the following table:

                identifier        expr
                ===============   ===============
                Int               Int, Float
                Float             Int, Float
                Dayofweek         Dayofweek
                DateTime          DateTime
                String            String
                Size              Size
                Que               Que
                Job               Job
                CNode             CNode
                Server            Server
                Dayofweek         Dayofweek
                DateTime          DateTime
                Set Server        Set Server
                Set Que           Set Que
                Set Job           Set Job
                Set CNode         Set CNode
                Range Int         Range Int
                Range Float       Range Float
                Range Dayofweek   Range Dayofweek
                Range DateTime    Range DateTime
                Range Size        Range Size

    3. if...else statement
        The format of an if statement is similar to that in C with the delimiting "{" and "}" always present:

                if( expr ) {
                        zero or more (true) STATEMENTS
                }
                if( expr ) {
                        zero or more (true) STATEMENTS
                } else {
                        zero or more (false) STATEMENTS
                }

        The expr 's type must be either Int or Float, and after evaluation if its value is non-zero, then the true statements are executed. On the second form, if the expr evaluates to zero, then the false statements are executed.

        Some sample if statements are given below:

                if (2 * x )
                {
                        y = y + 3;
                        print(y);
                }
                if (2 * x ) {
                        y = y + 3;
                } else {
                        if( 3 * x ) {
                                y = 4;
                        } else {
                                y = 5;
                        }
                }

    4. for loop statement
        The format of a for statement is as follows:

                for( start; test; action ) {
                        zero or more STATEMENTS
                }

        Just like in C, for first executes start , then evaluates the test condition to see if it returns a non-zero value. If it does, the for statements are executed. After the for statements are executed, then action is evaluated, and then it checks the test condition again in the same manner as before. start and action can be a simple assignment expression or a post-operator expression. test is a logical/relational expression. Some sample for statements are given in the following:

                for (i = 0; i LT 3 ; i = i + 1)
                {
                        print(i);
                }
                for (i = 0; i LT 2 * x; i++)
                {
                        if (x GT 3)
                       {
                                y = 99;
                        } else
                        {
                                x = 73;
                        }
                }

    5. foreach loop statement
        This statement is primarily used for successively retrieving each element of a Set data type: Set Server, Set CNode, Set Job, Set Que. The syntax is:

                foreach ( IDENTIFIER1 in IDENTIFIER2 ) {
                        zero or more STATEMENTS
                }

        where the following pairing of types for the identifiers are allowed:

                IDENTIFIER1   IDENTIFIER2
                ===========   ===========
                Server        Set Server
                Que           Set Que
                Job           Set Job
                CNode         Set CNode

        Example:
                Server  s;
                Que     q;
                Job     j;
                CNode   c;
                Set Server ss;
                Set Que    sq;
                Set Job    sj;
                Set CNode  sc;
                foreach(s in ss){
                        print(s);
                }
                foreach(q in sq){
                        print(q);
                }
                foreach(j in sj){
                        print(j);
                }
                foreach(c in sc){
                        print(c);
                }

    6. while loop statement
        The syntax of a while loop is:

                while ( expr ) {
                        zero or more STATEMENTS
                }

        where expr must be of Int or Float type. If expr is non-zero, then the zero or more are executed and expr is re-evaluated.

        Example:
                Int i;
                i = 3;
                while(i) {
                        if( i EQ 0 ) {
                                print("break on i = 1");
                                break;
                        }
                        i--;
                }

    7. switch statement
        The switch statement is a mult-way decision that tests whether an identifier's value matches one of a number of values, and branches to a group of statements accordingly.
        The syntax for a switch statement is:

                switch( IDENTIFIER )  {
                        case constant-expr :
                                {
                                        zero or more STATEMENTS
                                }
                        case constant-expr :
                                {
                                        zero or more STATEMENTS
                                }
                          ...
                        case in constant-rangeOrSet-expr :
                                {
                                        zero or more STATEMENTS
                                }
                        case in IDENTIFIER-rangeOrSettype :
                                {
                                        zero or more STATEMENTS
                                }
                        default :
                                {
                                        zero or more STATEMENTS
                                }
                }

        where constant-expr is an expr of type Int, Float, Dayofweek, DateTime, Size, String, Server, Que, Job, or CNode. constant-rangeOrSet-expr and IDENTIFIER-rangeOrSettype can be of type Set Server, Set CNode, Set Que, Set Job, Range Int, Range Float, Range Dayofweek, Range DateTime, or Range Size.

        IDENTIFIER cannot be of type Void. IDENTIFIER 's type must be consistent with constant-expr 's, constant-rangeOrSet-expr 's, and IDENTIFIER-rangeOrSettype 's type as illustrated in the following table:
           IDENTIFIER  constant-range-expr, IDENTIFIER-rangetype
           =========== =========================================
           Server      Set Server
           Que         Set Que
           Job         Set Job
           CNode       Set CNode
           Int         Range Int
           Float       Range Float
           Dayofweek   Range Dayofweek
           DateTime    Range DateTime
           Size        Range Size

        If a case expression matches the IDENTIFIER 's value, then the corresponding block of statements are executed. Unlike in C, execution does NOT fall through to the next case statement. The reason for this is that will translate this switch statement into if-elseif-else construct. The case labeled default is executed if none of the other cases are satisfied. The default is optional; if it isn't there, and if none of the cases match, no action takes place.

        Example:
                Dayofweek dow;
                switch(dow)
                {
                        case MON:
                        {
                                print("case MON");
                        }
                        case TUE:
                        {
                                print("case TUE");
                        }
                        case WED:
                        {
                                print("case WED");
                        }
                        case THU:
                        {
                                print("case THU");
                        }
                        case FRI:
                        {
                                print("case FRI");
                        }
                        case SAT:
                        {
                                print("case SAT");
                        }
                        case SUN:
                        {
                                print("case SUN");
                        }
                        default:
                        {
                                print("case defaulted");
                        }
                }
                Int a;
                Range Int ri;
                ri = (10, 12);
                switch(a)
                {
                        case in (1,5):
                        {
                                print("case 1,5");
                        }
                        case in (6,9):
                        {
                                print("case 6,9");
                        }
                        case in ri:
                        {
                                print("case ri");
                        }
                }

    8. print statement
        Print statement is capable of printing to stdout the value of any identifier or constant of type Int, Float, Dayofweek, DateTime, String, Size, Que, Job, CNode, Server, Range Int, Range Float, Range Dayofweek, Range DateTime, Range Size.
        The syntax is as follows:

                print ( IDENTIFIER );
                print ( constant );

        Example:
                DateTime dt;
                CNode cn;
                dt = (4|4|1997@12:13:36);
                cn = AllNodesLocalHostGet();
                print(dt);
                print(cn);

        For Set types, use foreach to go through each element and print as in:

                Server s;
                Set Server ss;
                ss = AllServersGet();
                foreach(s in ss) {
                        print(s);
                }

    9. continue statement

                continue ;

        The continue statement must have been invoked within a for, foreach, and while loop. It causes the next iteration of the enclosing loop to begin.

    10. break statement

                break ;

        The break statement must have been invoked within a for, foreach, and while loop. It provides an early exit from the enclosing loop.

    11. return statement

                return(IDENTIFIER) ;
                return(constant) ;
                return() ;

        The return statement provides the value (if any) to be returned by a function. The type returned by IDENTIFIER and constant must match the calling function's return type. constant types allowed are anything except Set and Range types. The last format, return() is usually called within a function that doesn't return any value ( like sched_main() ).

    12. exit statement

                exit(constant);

        where constant is of type Int. Calling this will terminate the scheduler.

    13. Comment statement
        These are statements prefixed by "//" and they are ignored by the BASL compiler.

               // this line is ignored
               Int i;  // string following the slashes is ignored

OPERATOR PRECEDENCE AND ASSOCIATIVITY
The following table shows the various operator precedence levels and associativity defined in the BASL language. The operators are listed in the order of decreasing precedence. The higher the precedence of an operator, the earlier it gets executed. The order in which the operators on the same level are executed depends on the associativity: left means the operators are seen from left to right, while right means they are seen from right to left.

    Operator                                     Associativity
    =======================================      =============
    ! ++ -- + (unary plus) - (unary minus)       right
    * / %                                        left
    + -                                          left
    LT LE GT GE                                  left
    EQ NEQ                                       left
    AND                                          left
    OR                                           left
    =                                            right

PREDEFINED FUNCTIONS
In BASL(2), a Server data type maps directly to a batch server object. Similarly, CNode is to mom/resmom, Job is to batch job, and Que is to batch queue. However, not all attributes to the PBS objects can be accessed from BASL. Only a subset of attributes, those that seemed to make sense in the context of a scheduler, are made available, and values to these attributes can be accessed by calling the following predefined functions, known also as assist/helper functions.

    (1) Server-related functions

        Set Server AllServersGet(void)
            Returns the list of servers specified in the configuration file for which the scheduler writer wants the system to periodically check for status, queues and jobs info. See pbs__sched__basl(8B) for a discussion on the format of the configuration file.
            CAUTION: This function must be called from inside sched_main() so that at every scheduling iteration, the most up to date Set Server structure is returned.

        Server AllServersLocalHostGet(void)
            Returns the Server object that represents the local host. unset value: NOSERVER. This is a simple function to call for non-cluster environments where only one server host exists.
            CAUTION: This function must be called from inside sched_main() (or from within function called by sched_main) so that at every scheduling iteration, the most up to date Server structure is returned.

        String ServerInetAddrGet(Server s)
            Returns name for Server s. unset value: NULLSTR

        String ServerDefQueGet(Server s)
            Returns the default_queue attribute of Server s. unset value: NULLSTR

        Int ServerStateGet(Server s)
            Returns server_state attribute of Server s.

            Return value:
                SERVER_ACTIVE, SERVER_IDLE, SERVER_SCHED, SERVER_TERM, SERVER_TERMDELAY, -1 (unset value)

        Int ServerMaxRunJobsGet(Server s)
            Returns max_running attribute of Server s. unset value: 0

        Int ServerMaxRunJobsPerUserGet(Server s)
            Returns max_user_run attribute of Server s. unset value: 0

        Int ServerMaxRunJobsPerGroupGet(Server s)
            Returns max_group_run attribute of Server s. unset value: 0

        Set Que ServerQueuesGet(Server s)
            Returns list of queues managed by Server s.

        Set Job ServerJobsGet(Server s)
            Returns list of jobs managed by Server s. For obtaining a subset of this list, see QueJobsGet().

        Int ServerIntResAvailGet(Server s, String name)
            Returns the value to resource specified in name that is available to jobs run by this server (Server attribute). Call this function for resources with values that are of Int type. Sample resource names are: cput, pcput, walltime, mppt, pmppt, nice, procs, mppe, ncpus, pncpus, nodect, srfs_assist, mta,..., mth. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

            Example:
               Int cpuAvail;
               // return the # of cpus currently available in
               // the server
               cpuAvail = ServerIntResAvailGet(server, "ncpus");

        Size ServerSizeResAvailGet(Server s, String name)
            Returns the value to resource specified in name that is available to jobs run by this server (Server attribute). Call this function for resources with values that are of Size type. Sample resource names are: file, mem, pmem, workingset, pf, ppf, srfs_tmp, srfs_wrk, srfs_big, srfs_fast, sds, psds. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

            Example:
               Size memAvail;
               // return the amount of available memory in
               // the server
               memAvail = ServerSizeResAvailGet(server, "mem");

        String ServerStringResAvailGet(Server s, String name)
            Returns the value to resource specified in name that is available to jobs run by this server (Server attribute). Call this function for resources with values that are of String type. Sample resource names are: nodes, arch, neednodes. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

            Example:
               String type;
               // return the architecture (or os type) of
               // the server
               type = ServerStringResAvailGet(server, "arch");

        Int ServerIntResAssignGet(Server s, String name)
            Returns the value to resource specified in name that is allocated to running jobs (Server attribute). Call this function for resources with values that are of Int type. Sample resource names are: cput, pcput, walltime, mppt, pmppt, nice, procs, mppe, ncpus, pncpus, nodect, srfs_assist, mta,..., mth. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

            Example:
               Int cpuAssn;
               // return the # of cpus currently assigned in
               // the server
               cpuAssn = ServerIntResAssignGet(server, "ncpus");

        Size ServerSizeResAssignGet(Server s, String name)
            Returns the value to resource specified in name that is allocated to running jobs (Server attribute). Call this function for resources with values that are of Size type. Sample resource names are: file, mem, pmem, workingset, pf, ppf, srfs_tmp, srfs_wrk, srfs_big, srfs_fast, sds, psds. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

            Example:
               Size sdsAssn;
               // return the amount of sds space currently assigned
               // in the server
               sdsAssn = ServerSizeResAssignGet(server, "sds");

        String ServerStringResAssignGet(Server s, String name)
            Returns the value to resource specified in name that is allocated to running jobs (Server attribute). Call this function for resources with values that are of String type. Sample resource names are: nodes, arch, neednodes. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

        Set CNode ServerNodesGet(Server s)
            Returns the set of nodes managed by server s. unset value: EMPTYSETCNODE.
            NOTE: You can usually call the following functions for the nodes returned by this call: CNodeStateGet(), CNodePropertiesGet(), and CNodeTypeGet().

        Int ServerNodesQuery(Server s, String spec)
            Issues a request to the specified server to query the availability of resources specified in spec. At the present time, the only resource specification allowed is one that involves "nodes" and it can be of the format "nodes", "nodes=", or "nodes=<type>". The query results can be accessed by calling the following functions: ServerNodesNumAvailGet(), ServerNodesNumAllocGet(), ServerNodesNumRsvdGet(), ServerNodesNumDownGet().
            NOTE: This is a wrapper to the pbs_rescquery(3B) server function.

            Return value:
                SUCCESS, FAIL

        Int ServerNodesNumAvailGet(Server s)
            Returns the number of nodes available for those managed by the specified server, or as reflected by the most recent query specified by ServerNodesQuery(). If the return value is zero, then this means that some number of nodes currently needed to satisfy the specification of ServerNodesQuery() are currently unavailable. The request maybe satisfied at some later time. If the result is negative, no combination of known nodes can satisfy the specification.

        Int ServerNodesNumAllocGet(Server s)
            Returns the number of nodes allocated for those managed by the specified server, or as reflected by the most recent query specified by ServerNodesQuery().

        Int ServerNodesNumRsvdGet(Server s)
            Returns the number of nodes reserved for those managed by the specified server, or as reflected by the most recent query specified by ServerNodesQuery().

        Int ServerNodesNumDownGet(Server s)
            Returns the number of nodes down for those managed by the specified server, or as reflected by the most recent query specified by ServerNodesQuery().

        Int ServerNodesReserve(Server s,String spec,Int resId)
            Issues a request to the specified server to reserve the resources specified in spec. A value of 0 for resId means that this is for doing a new reservation. Otherwise, the number will represent an existing (partial) reservation. Resources currently reserved for this resId will be released and the full reservation will be attempted again. At the present time the only resources which may be specified are "nodes". It should be specified as nodes=specification where specification is what a user specifies in the -l option arguement list for nodes, see qsub (1B).
            NOTE: This is a wrapper to the pbs_rescreserve(3B) server function.

            Return value:
                a reference number to a successful or partially-successful reservation, or FAIL

        Int ServerNodesRelease(Server s, Int resId)
            This releases or frees resources reserved with the reference number specified in resId.
            NOTE: This is a wrapper to the pbs_rescrelease(3B) server function.

            Return value:
                SUCCESS, or FAIL

    (2) Que-related functions:

        String QueNameGet( Que que )
            Returns name of Que que. unset value: NULLSTR

        Int QueTypeGet( Que que )
            Returns queue_type attribute of Que que.
            Return value: QTYPE_E (Execution), QTYPE_R (Routing), -1 (unset value)

        Int QueNumJobsGet( Que que )
            Returns number of jobs residing in Que que. unset value: 0

        Int QueMaxRunJobsGet( Que que )
            Returns max_running attribute of Que que. unset value: 0

        Int QueMaxRunJobsPerUserGet( Que que )
            Returns max_user_run attribute of Que que. unset value: 0

        Int QueMaxRunJobsPerGroupGet( Que que )
            Returns max_group_run attribute of Que que. unset value: 0

        Int QuePriorityGet( Que que )
            Returns Priority attribute of Que que. unset value: 0

        Int QueStateGet( Que que )
            Returns started attribute of Que que - the job execution selection state of the que: SCHED_DISABLED, SCHED_ENABLED. unset value: SCHED_DISABLED

        Set Job QueJobsGet( Que que )
            Returns the list of jobs currently residing in que.

        Int QueIntResAvailGet(Que q, String name)
            Returns the value to resource specified in name that is available to jobs running from this q (Que attribute). Call this function for resources with values that are of Int type. Sample resource names are: cput, pcput, walltime, mppt, pmppt, nice, procs, mppe, ncpus, pncpus, nodect, srfs_assist, mta,..., mth. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

        Size QueSizeResAvailGet(Que q, String name)
            Returns the value to resource specified in name that is available to jobs running from this q (Que attribute). Call this function for resources with values that are of Size type. Sample resource names are: file, mem, pmem, workingset, pf, ppf, srfs_tmp, srfs_wrk, srfs_big, srfs_fast, sds, psds. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

        String QueStringResAvailGet(Que q, String name)
            Returns the value to resource specified in name that is available to jobs running from this q (Que attribute). Call this function for resources with values that are of String type. Sample resource names are: nodes, arch, neednodes. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

        Int QueIntResAssignGet(Que q, String name)
            Returns the value to resource specified in name that is allocated to jobs running from this queue (Que attribute). Call this function for resources with values that are of Int type. Sample resource names are: cput, pcput, walltime, mppt, pmppt, nice, procs, mppe, ncpus, pncpus, nodect, srfs_assist, mta,..., mth. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

        Size QueSizeResAssignGet(Que q, String name)
            Returns the value to resource specified in name that is allocated to jobs running from this q (Que attribute). Call this function for resources with values that are of Size type. Sample resource names are: file, mem, pmem, workingset, pf, ppf, srfs_tmp, srfs_wrk, srfs_big, srfs_fast, sds, psds. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

        String QueStringResAssignGet(Que q, String name)
            Returns the value to resource specified in name that is allocated to jobs running from this q (Que attribute). Call this function for resources with values that are of String type. Sample resource names are: nodes, arch, neednodes. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

    (3) Job-related functions

        String JobIdGet( Job job )
            Returns job identifier of Job job. unset value: NULLSTR

        String JobNameGet( Job job )
            Returns Job_Name attribute of Job job. unset value: NULLSTR

        String JobOwnerNameGet( Job job )
            Returns Job_Owner attribute of Job job. unset value: NULLSTR

        String JobEffectiveUserNameGet( Job job)
            Returns euser attribute of Job job.

        String JobEffectiveGroupNameGet(Job job)
            Returns egroup attribute of Job job. unset value: NULLSTR

        Int JobStateGet ( Job job )
            Returns job_state attribute of Job job.

            Return value:
                TRANSIT, QUEUED, HELD, WAITING, RUNNING, EXITING, -1 (unset value)

        Int JobPriorityGet( Job job )
            Returns Priority attribute of Job job. unset value: 0

        Int JobRerunFlagGet( Job job )
            Returns Rerunable attribute of Job job.
            Return value: FALSE, TRUE, -1 (unset value)

        Int JobInteractiveFlagGet( Job job )
            Returns interactive attribute of Job job.
            Return value: FALSE, TRUE. unset value: FALSE

        DateTime JobDateTimeCreatedGet(Job job)
            Returns the ctime attribute of Job job. unset value: (0|0|0@-1:-1:-1)

        String JobEmailAddrGet( Job job )
            Returns the Mail_Users attribute of Job job. unset value: NULLSTR

        String JobStageinFilesGet( Job job )
            Returns the stagein attribute of Job job. unset value: NULLSTR

        String JobStageoutFilesGet( Job job )
            Returns stageout attribute of Job job. unset value: NULLSTR

        Int JobIntResReqGet(Job job, String name)
            Returns the value to resource specified in name as required by the job (Job attribute). Call this function for resources with values that are of Int type. Sample resource names are: cput, pcput, walltime, mppt, pmppt, nice, procs, mppe, ncpus, pncpus, nodect, srfs_assist, mta,..., mth. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

            Example:
               Int cputReq;
               // returns the cput requirement of the job
               cputReq = JobIntResReqGet(job, "cput");

        Size JobSizeResReqGet(Job job, String name)
            Returns the value to resource specified in name as required by the job (Job attribute). Call this function for resources with values that are of Size type. Sample resource names are: file, mem, pmem, workingset, pf, ppf, srfs_tmp, srfs_wrk, srfs_big, srfs_fast, sds, psds. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

            Example:
               Size memReq;
               // returns the memory requirement of the job
               memReq = JobSizeResReqGet(job, "mem");

        String JobStringResReqGet(Job job, String name)
            Returns the value to resource specified in name as required by the job (Job attribute). Call this function for resources with values that are of String type. Sample resource names are: nodes, arch, neednodes. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

            Example:
               String nodes;
               // returns the nodes requirement property of
               // the job
               nodes = JobStringResReqGet(job, "nodes");

        Int JobIntResUseGet(Job job, String name)
            Returns the value to resource specified in name used by the job (Job attribute). Call this function for resources with values that are of Int type. Sample resource names are: cput, pcput, walltime, mppt, pmppt, nice, procs, mppe, ncpus, pncpus, nodect, srfs_assist, mta,..., mth. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

            Example:
               Int walltUse;
               // returns the amount of walltime used by
               // the job
               walltUse = JobIntResUseGet(job, "walltime");

        Size JobSizeResUseGet(Job job, String name)
            Returns the value to resource specified in name used by the job (Job attribute). Call this function for resources with values that are of Size type. Sample resource names are: file, mem, pmem, workingset, pf, ppf, srfs_tmp, srfs_wrk, srfs_big, srfs_fast, sds, psds. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

            Example:
               Size srfsUse;
               // returns the amount of srfs_fast used by
               // the job
               srfsUse = JobSizeResUseGet(job, "srfs_fast");

        String JobStringResUseGet(Job job, String name)
            Returns the value to resource specified in name used by the job (Job attribute). Call this function for resources with values that are of String type. Sample resource names are: nodes, arch, neednodes. For a description of these resource names, see pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), pbs_resources_irix6(7B), pbs_resources_linux(7B).

    (4) CNode-related functions

        Set CNode AllNodesGet(void)
            Returns list of nodes that are managed by the server running on the local host. This could also include those nodes that were specified in the scheduler configuration file for which the scheduler writer wants the system to periodically check for information like state, property, and so on. See pbs_sched_basl(8B) for a discussion of configuration file format.
            CAUTION: This function must be called from inside sched_main() so that at every scheduling iteration, the most up to date Set CNode structure is returned. Do not call this from an assignment statement intended to initialize a global variable, as the statement will only be called once.

        CNode AllNodesLocalHostGet(void)
            Returns the CNode object that represents the local host. This is a simple function to call for non-clustered systems where only 1 CNode exists. unset value: NOCNODE
            CAUTION: This function must be called from inside sched_main() (or from within functions called by sched_main) so that at every scheduling iteration, the most up to date CNode structure is returned. Do not call this from an assignment statement intended to initialize a global variable, as the statement will only be called once.

        String CNodeNameGet(CNode node)
            Returns the unique (official) name of the node (i.e. ResMom hostname in a 1 mom/node model). This returns the same string that was specified in the configuration file. unset value: NULLSTR

        String CNodeOsGet(CNode node)
            Returns the os architecture of the node (i.e. "irix5", "sp2"). unset value: NULLSTR

        Int CNodeStateGet( CNode node )
            Returns the node's state.

            Return value:
                CNODE_OFFLINE, CNODE_DOWN, CNODE_FREE, CNODE_RESERVE, CNODE_INUSE_EXCLUSIVE, CNODE_INUSE_SHARED, CNODE_UNKNOWN

        Int CNodeTypeGet( CNode node )
            Returns the node's type.

            Return value:
                CNODE_TIMESHARED, CNODE_CLUSTER, CNODE_UNKNOWN

        String CNodePropertiesGet(CNode node)
            Returns the comma-separated list of other names the node is known by ( properties, other network name). For example, "babbage.nas.nasa.gov" maybe the node name, but it could also be known via "babbage1, babbage2". unset value: NULLSTR

        String CNodeVendorGet(CNode node)
            Returns the name of the vendor for the hardware of the machine (i.e. "sgi", "ibm"). unset value: NULLSTR

        Int CNodeNumCpusGet(CNode node)
            Returns the number of processors attached to the node. unset value: -1

        Size  CNodeMemTotalGet( CNode node, String type )
            Returns total memory of type for the node. type is an arbitrary string that the scheduler writer defines in the scheduler configuration file. unset value: -1b
            Example:
               // get total physical memory
               CNodeMemTotalGet(node, "real")
               // get total virtual memory
               CNodeMemTotalGet(node, "virtual")

        Size  CNodeMemAvailGet( CNode node, String type )
            Returns available memory of type for the node. type is an arbitrary string that the scheduler writer defines in the scheduler configuration file. unset value: -1b
            So sample calls will be:
              // get available physical memory
              CNodeMemAvailGet(node, "real")
              // get available virtual memory
              CNodeMemAvailGet(node, "virtual")

        Int CNodeIdletimeGet( CNode node )
            Returns number of seconds in which no keystroke or mouse movement has taken place on any terminal connected to the node. unset value: -1

        Float CNodeLoadAveGet( CNode  node )
            Returns node's load average for all cpus. unset value: -1.0

        Int CNodeCpuPercentIdleGet( CNode  node )
            Returns the percent of idle time that all the processors of the node have experienced.

        Int CNodeCpuPercentSysGet( CNode  node )
            Returns the percent of time that all the processors of the node have spent running kernel code.

        Int CNodeCpuPercentUserGet( CNode  node )
            Returns the percent of time that all the processors of the node have spent running user code.

        Int CNodeCpuPercentGuestGet( CNode  node )
            Returns the percent of time that all the processors of the node have spent running a guest operating system.

        Int CNodeNetworkBwGet( CNode node, String type )
            Returns the bandwidth of the node's network of type in bytes/second. type is defined by the scheduler writer in the scheduler configuration file. unset value: -1
            Some sample calls are:
              CNodeNetworkBwGet( node, "hippi" );
              CNodeNetworkBwGet( node, "fddi" );

        Size CNodeDiskSpaceTotalGet(CNode node, String name)
            Returns the node's total space on disk identified by name where name is the device name arbitrarily defined by the scheduler writer in the scheduler configuration file. unset value: -1b
            Example:
              CNodeDiskSpaceTotalGet( node, "/scratch2" );

        Size CNodeDiskSpaceAvailGet(CNode node, String name)
            Returns the node's available space on disk identified by name where name is arbitrarily defined by the scheduler writer in the scheduler configuration file. unset value: -1b
            Example:
              CNodeDiskSpaceAvailGet( node, "/scratch1" );

        Size CNodeDiskSpaceReservedGet(CNode node, String name)
            Returns the node's reserved space on disk (user quota?) identified by name where name is arbitrarily defined by the scheduler writer in the scheduler configuration file. unset value: -1b
            Example:
              CNodeDiskSpaceReservedGet( node, "/scratch1" );

        Int CNodeDiskInBwGet( CNode node, String name )
            Returns the write bandwith (bytes/sec) of the node's disk identified by name . unset value: -1
            Example:
              CNodeDiskInBwGet( node, "/fast" );

        Int CNodeDiskOutBwGet( CNode node, String name )
            Returns read bandwith (bytes/sec) of the node's disk identified by name . unset value: -1
            Example:
              CNodeDiskOutBwGet( node, "/big" );

        Size CNodeSwapSpaceTotalGet( CNode node, String name )
            Returns the node's total space on swap identified by name where name is arbitrarily defined by the scheduler writer in the scheduler configuration file. unset value: -1b
            Example:
              CNodeSwapSpaceTotalGet( node, "primary" );

        Size CNodeSwapSpaceAvailGet( CNode node, String name )
            Returns node's available space on swap identified by name where name is the device name arbitrarily defined by the scheduler writer in the scheduler configuration file. unset value: -1b
            Example:
              CNodeSwapSpaceAvailGet( node, "secondary" );

        Int CNodeSwapInBwGet( CNode node, String name )
            Returns swapin rate of the node's swap device identified by name.
            Example:
              CNodeSwapInBwGet(node, "secondary");

        Int CNodeSwapOutBwGet( CNode node, String name )
            Returns the swapout rate of the node's swap device identified by name. unset value: -1
            Example:
              CNodeSwapOutBwGet(node, "primary");

        Size CNodeTapeSpaceTotalGet( CNode node, String name )
            Returns the node's total space on tape identified by name where name is arbitrarily defined by the scheduler writer in the scheduler configuration file. unset value: -1b
            Example:
              CNodeTapeSpaceTotalGet(node, "4mm");

        Size CNodeTapeSpaceAvailGet( CNode node, String name )
            Returns the node's available space on tape identified by name where name is arbitrarily defined by the scheduler writer in the scheduler configuration file. unset value: -1b
            Example:
              CNodeTapeSpaceAvailGet(node, "8mm");

        Int CNodeTapeInBwGet( CNode node, String name )
            Returns the write bandwith (bytes/sec) of the node's tape identified by name . unset value: -1
            Example:
              CNodeTapeInBwGet( node, "4mm" );

        Int CNodeTapeOutBwGet( CNode node, String name )
            Returns the read bandwith (bytes/sec) of the node's tape identified by name . unset value: -1
            Example:
            CNodeTapeOutBwGet( node, "8mm" );

        Size CNodeSrfsSpaceTotalGet( CNode node, String name )
            Returns the node's total space on srfs device identified by name where name is arbitrarily defined by the scheduler writer in the scheduler configuration file. unset value: -1b
            Example:
              CNodeSrfsSpaceTotalGet(node, "/fast");

        Size CNodeSrfsSpaceAvailGet( CNode node, String name )
            Returns the node's available space on srfs device identified by name where name is arbitrarily defined by the scheduler writer in some configuration file. unset value: -1b
            Example:
              CNodeSrfsSpaceAvailGet( node, "/big" );

        Size CNodeSrfsSpaceReservedGet(CNode node, String name)
            Returns the node's total amount of reserved space on srfs device identified by name where name is arbitrarily defined by the scheduler writer in the scheduler configuration file. unset value: -1b
            Example:
              CNodeSrfsSpaceReservedGet( node, "/fast" );

        Int CNodeSrfsInBwGet( CNode node, String name )
            Returns the write bandwith (bytes/sec) of the node's srfs device identified by name . unset value: -1
            Example:
              CNodeSrfsInBwGet( node, "/fast" );

        Int CNodeSrfsOutBwGet( CNode node, String name )
            Returns the read bandwith (bytes/sec) of the node's srfs device identified by name . unset value: -1
            Example:
            CNodeSrfsOutBwGet( node, "/big" );

    (5) Miscellaneous Functions

        DateTime datetimeGet()
            gets the current date/time.

        Int datetimeToSecs(DateTime dt)
            returns the # of seconds since epoch (beginning of UNIX time - 00:00:00, January 1, 1970) for the given date/time dt.

        Int JobAction( Job job, Int action, String param )
            Performs action on job with a param specified depending on the action. action can be: SYNCRUN, ASYNCRUN, DELETE, RERUN, HOLD, RELEASE, SIGNAL, MODIFYATTR, MODIFYRES where:
              Action              Description
              ===============     ==========================
              SYNCRUN             runs the job synchronously,
                                  meaning the call to
                                  JobAction() will only
                                  return when the job has
                                  started running or when
                                  an error has been
                                  encountered.
                                  Param value:
                                   name of host(s) to run
                                   job under.
              ASYNCRUN            runs the job asynchronously,
                                  meaning the call to
                                  JobAction() will return
                                  immediately as soon as
                                  the run request is
                                  validated by the PBS server,
                                  and not necessarily when
                                  the job has started
                                  execution.
                                  Param value:
                                    name of host(s) to run
                                    job under.
              DELETE              deletes the job.
                                  Param value:
                                    "deldelay=<# of secs>"
                                    - delay # of seconds
                                      between the sending
                                      of SIGTERM and SIGKILL
                                      to the job before
                                      getting deleted.
              RERUN                reruns the running job,
                                   which involves terminating
                                   the session leader of the
                                   job and returning the job
                                   to the queued state.
              HOLD                 places one or more holds
                                   on the job.
                                   Param value:
                                    "u", "o", "s", "uo", "os",
                                    "uos"
                                    - type of holds to place
                                      on job: u(ser), o(ther),
                                      s(ystem).
              RELEASE              removes or releases
                                   holds placed on jobs.
                                   Param value:
                                    "u", "o", "s", "uo", "os",
                                    "uos"
                                    - type of holds to remove
                                      from job: u(ser), o(ther),
                                      s(ystem).

              SIGNAL               sends a signal to the
                                   executing job.
                                   Param value:
                                     "HUP", "SIGHUP",...
              MODIFYATTR           modifies the specified
                                   attribute of the job to
                                   the given value, when
                                   the attrib_name is
                                   != "Resource_List" or
                                   "resources_used".
                                   Param value:
                                     "attrib_name=value"
              MODIFYRES            modifies the job's
                                   Resource_List
                                   attribute given the
                                   res_name and the
                                   res_value:
                                   Resource_List.res_name=
                                                 res_value
                                   Param value:
                                    "res_name=res_val"
            param value depends on the action. Specify NULLSTR if no value for this parameter is desired.
            Return value: SUCCESS or FAIL.
            NOTE: Any unrecognized action is ignored.
            Example:
              // run Job j synchronously
              JobAction(j, SYNCRUN, NULLSTR);
              // run Job j asynchronously on host "db"
              JobAction(j, ASYNCRUN, "db");
              // delete Job j
              JobAction(j, DELETE, NULLSTR);
              // delete Job j with a delay of 5 secs
              // between the sending of SIGTERM and
              // SIGKILL
              JobAction(j, DELETE, "deldelay=5");
              // rerun Job j
              JobAction(j, RERUN, NULLSTR);
              // place a u(ser) hold on Job j
              JobAction(j, HOLD, "u");
              // place an o(ther) hold on Job j
              JobAction(j, HOLD, "o");
              // place a s(ystem) hold on Job j
              JobAction(j, HOLD, "s");
              // place a default hold (u) on Job j
              JobAction(j, HOLD, NULLSTR);
              // release u(ser) hold from Job j
              JobAction(j, RELEASE, "u");
              // release o(ther) hold from Job j
              JobAction(j, RELEASE, "o");
              // release s(ystem) hold from Job j
              JobAction(j, RELEASE, "s");
              // release default hold (u) from Job j
              JobAction(j, RELEASE, NULLSTR);
              // send SIGHUP signal to Job j
              JobAction(j, SIGNAL, "SIGHUP");
              // update the comment attribute of Job
              // j to "a message".
              // The param format is: attribute_name=new_value
              // Consult PBS documentation for a list of job
              // attribute names that can be specified.
              JobAction(j, MODIFYATTR, "comment=a message");
              // update the Resource_List.cput attribute of Job
              // j to 3600 seconds.
              // The param format is: resource_name=new_value
              // See pbs_resources* man page for a list of
              // resource_names that can be specified.
              JobAction(j, MODIFYRES, "cput=3600");

        QueJobFind(Que que,Fun Int func,Int cpr,Int value);

        QueJobFind(Que que,Fun String func,Int cpr,String value);

        QueJobFind(Que que,Fun DateTime func,Int cpr,DateTime value);

        QueJobFind(Que que,Fun Size func,Int cpr,Size value);

            where cpr is one of: OP_EQ, OP_NEQ, OP_LE, OP_LT, OP_GE, OP_GT. func is a function whose ONLY argument is of Job type. Job is the return type.

            Description: Applies func to every job in que , and return the first job that satisfies the logical comparison: func(job) cpr value

            Example:

            Size JobVirtualMemAvailGet(Job job)
            {
                Size sz;
                sz = JobSizeResReqGet(job, "mem");
                return(sz);
            }
            Int JobWallTimeReqGet(Job job)
            {
                Int wallt;
                wallt = JobIntResReqGet(job, "walltime");
                return(wallt);
            }
            Int JobCpuTimeUsedGet(Job job)
            {
                Int cput;
                cput = JobIntResUseGet(job, "cput");
                return(cput);
            }
            Que findQueByName(Set Que queues, String qname)
            {
                    Que q;
                    foreach(q in queues) {
                            if( QueNameGet(q) EQ qname ) {
                                   return(q);
                            }
                    }
                    return(NOQUE);
            }
            sched_main()
            {
               Server s;
               Que    que;
               Set Que sq;
               // get local server
               s = AllServersLocalHostGet();
               // get the queues of the Server s
               sq = ServerQueuesGet(s);
               // get the queue named "fast" from the
               // local server
               que = findQueByName( sq, "fast" );
               // Find the 1st job whose walltime requirement
               // is == 300s:
               QueJobFind(que, JobWallTimeReqGet, OP_EQ, 300);
               // Find the 1st job whose email address to
               // notify about job activity != "bayucan":
               QueJobFind(que, JobEmailAddrGet, OP_NEQ,
                                                  "bayucan");
               // Find the 1st job that was created after
               // or on 3/3/1997:
               QueJobFind(que, JobDateTimeCreatedGet, OP_GE,
                                                    (3|3|1997));
               // Find the 1st job that was created after
               // 3:3:44:
               QueJobFind(que, JobDateTimeCreatedGet, OP_GT,
                                                     (3:3:44));
               // Find the 1st job that was created after
               // 3:3:44 on 3/3/1997:
               QueJobFind(que, JobDateTimeCreatedGet, OP_GT,
                                            (3|3|1997@3:3:44));
               // Find the 1st job whose cpu time used < 1600s:
               QueJobFind(que, JobCpuTimeUsedGet, OP_LT, 1600);
               // Find the 1st job whose virtual memory
               // requirement <= 300mb:
               QueJobFind(que, JobVirtualMemAvailGet, OP_LE,
                                                        300mb);
            }

        Job QueJobFind( Que que, Fun Int func,      Int cpr)

        Job QueJobFind( Que que, Fun String func,   Int cpr)

        Job QueJobFind( Que que, Fun DateTime func, Int cpr)

        Job QueJobFind( Que que, Fun Size func,     Int cpr)

            where cpr can be one of the following: OP_MAX, OP_MIN, func is a function whose only argument is of Job type.

            Description: Returns the Job with the max or min value found for func(job) as it is applied to every job in que .

            Example:
              Int JobCpuTimeReqGet(Job job)
              {
                Int cput;
                cput = JobIntResReqGet(job, "cput");
                return(cput);
              }
              sched_main()
              {
                Que que;
                Job job;
                // Find the Job with the highest cpu time
                // requirement:
                job = QueJobFind(que, JobCpuTimeReqGet, OP_MAX);
                // Find the Job with the minimum cpu time
                // requirement:
                job = QueJobFind(que, JobCpuTimeReqGet, OP_MIN);
              }

        Que QueFilter(Que que,Fun Int func,Int cpr,Int value)

        Que QueFilter(Que que,Fun String func,Int cpr,String value)

        Que QueFilter(Que que,Fun DateTime func,Int cpr,Date value)

        Que QueFilter(Que que,Fun Size func,Int cpr,Size value)

            where cpr can be one of the following: OP_EQ, OP_NEQ, OP_LE, OP_LT, OP_GE, OP_GT, func is a function whose only argument is of Job type.

            Description: Applies func to every job in que , and returns a new que containing all jobs that satisfies the comparison condition: func(job) cpr value

            Example:
              Int JobWallTimeReqGet(Job job)
              {
                Int wallt;
                wallt = JobIntResReqGet(job, "walltime");
                return(wallt);
              }
              sched_main()
              {
                Que que;
                Que newq;
                // Returns a new que containing all jobs in "que"
                // with a walltime requirement == 300s:
                newq = QueFilter(que, JobWallTimeReqGet, OP_EQ, 300);
                // Returns a new que containing all jobs in "que"
                // with an email address != "bayucan":
                newq = QueFilter(que, JobEmailAddrGet, OP_NEQ, "bayucan");
                // Returns a new que containing all jobs in "que"
                // created after or on 3/3/1997:
                newq = QueFilter(que, JobDateTimeCreatedGet, OP_GE,
                                                     (3|3|1997));
                // Returns a new que containing all jobs in "que"
                // created after 3:3:44:
                newq = QueFilter(que, JobDateTimeCreatedGet, OP_GT,
                                                      (3:3:44));
                // Returns a new que containing all jobs in "que"
                // created after 3:3:44 on 3/3/1997:
                newq = QueFilter(que, JobDateTimeCreatedGet, OP_GT,
                                              (3|3|1997@3:3:44));
                // NOTE: The original "que" is not modified
                // whatsoever.
              }

        Int Sort(Set Job s, Fun Int      key, Int order)

        Int Sort(Set Job s, Fun String   key, Int order)

        Int Sort(Set Job s, Fun Float    key, Int order)

        Int Sort(Set Job s, Fun DateTime key, Int order)

        Int Sort(Set Job s, Fun Size     key, Int order)

            where s the set of jobs to sort. key is the sorting key which is a function whose only argument is of Job type, order is the sorting order: ASC, DESC.

            Description: sorts the elements of s , in either ASCending or DESCending order of values that were returned by the key function, as applied to every member of the set of jobs. The s object is modified with this call. This returns SUCCESS or FAIL depending on outcome of the sort.

            Examples:
              Size JobMemReqGet(Job job)
              {
                    Size mem;
                    mem = JobSizeResReqGet(job, "mem");
                    return(mem);
              }
              sched_main()
              {
                    Server  master;
                    Set Job jobs;
                    Int     order;
                    // get local server
                    master = AllServersLocalHostGet();
                    jobs = ServerJobsGet(master);
                    Sort(jobs, JobPriorityGet, ASC);
                    Sort(jobs, JobIdGet, DESC);
                    order = ASC;
                    Sort(jobs, JobDateTimeCreatedGet, order);
                    order = DESC;
                    Sort(jobs, JobMemReqGet, order);
              }

        Int Sort(Set Que s, Fun Int      key, Int order)

        Int Sort(Set Que s, Fun String   key, Int order)

        Int Sort(Set Que s, Fun Float    key, Int order)

        Int Sort(Set Que s, Fun DateTime key, Int order)

        Int Sort(Set Que s, Fun Size     key, Int order)

            where s the set of queues to sort. key is the sorting key which is a function whose only argument is of Que type, order is the sorting order: ASC, DESC.

            Description: sorts the elements of s , in either ASCending or DESCending order of values that were returned by the key function, as applied to every member of the set of queues. The s object is modified with this call. This returns SUCCESS or FAIL depending on outcome of the sort.

            Examples:
              Size QueMemAvailGet(Que que)
              {
                    Size mem;
                    mem = QueSizeResAvailGet(que, "mem");
                    return(mem);
              }
              sched_main()
              {
                    Server  master;
                    Set Que ques;
                    Int     order;
                    // get local server
                    master = AllServersLocalHostGet();
                    ques = ServerQueuesGet(master);
                    Sort(ques, QuePriorityGet, ASC);
                    Sort(ques, QueNameGet, ASC);
                    order = DESC;
                    Sort(ques, QueMemAvailGet, order);
              }

        Int Sort(Set Server s, Fun Int      key, Int order)

        Int Sort(Set Server s, Fun String   key, Int order)

        Int Sort(Set Server s, Fun Float    key, Int order)

        Int Sort(Set Server s, Fun DateTime key, Int order)

        Int Sort(Set Server s, Fun Size     key, Int order)

            where s the set of servers to sort. key is the sorting key which is a function whose only argument is of Server type, order is the sorting order: ASC, DESC.

            Description: sorts the elements of s , in either ASCending or DESCending order of values that were returned by the key function, as applied to every member of the set of servers. The s object is modified with this call. This returns SUCCESS or FAIL depending on outcome of the sort.

            Examples:
              Size ServerMemAvailGet(Server serv)
              {
                    Size mem;
                    mem = ServerSizeResAvailGet(serv, "mem");
                    return(mem);
              }
              sched_main()
              {
                    Set Server sserver;
                    Int     order;
                    Int     ret;
                    sserver = AllServersGet();
                    ret = Sort(sserver, ServerMaxRunJobsGet, ASC);
                    Sort(sserver, ServerInetAddrGet, ASC);
                    order = DESC;
                    Sort(sserver, ServerMemAvailGet, order);
              }

        Int Sort(Set CNode s, Fun Int      key, Int order)

        Int Sort(Set CNode s, Fun String   key, Int order)

        Int Sort(Set CNode s, Fun Float    key, Int order)

        Int Sort(Set CNode s, Fun DateTime key, Int order)

        Int Sort(Set CNode s, Fun Size     key, Int order)

            where s the set of nodes to sort. key is the sorting key which is a function whose only argument is of CNode type, order is the sorting order: ASC, DESC.

            Description: sorts the elements of s , in either ASCending or DESCending order of values that were returned by the key function, as applied to every member of the set of nodes. The s object is modified with this call. This returns SUCCESS or FAIL depending on outcome of the sort.

            Examples:
              Size CNodeMyMemAvailGet(CNode cn)
              {
                    Size mem;
                    mem = CNodeMemAvailGet(cn, "virtual");
                    return(mem);
              }
              sched_main()
              {
                    Set CNode scnode;
                    Int     order;
                    scnode = AllNodesGet();
                    Sort(scnode, CNodeIdletimeGet, ASC);
                    Sort(scnode, CNodeNameGet, ASC);
                    order = DESC;
                    Sort(scnode, CNodeMyMemAvailGet, order);
              }

CNode..Get() FUNCTIONS
The return values of the CNode..Get() functions discussed in the previous section are obtained by sending resource queries to the CNode's MOM at every scheduling iteration. For example, will return the value obtained from some <host resource> query (this could be the string "loadave") as sent to the node's MOM. The "<host resource> -> CNode..Get()" mappings are established internally, but they can be modified or more mappings can be added via the scheduler configuration file. The config file is discussed in pbs_sched_basl(8B).
Mappings already established are given in the following:

For all architectures:

   CNode..Get() actual call    host resource
   ========================    =============
   CNodeOsGet(node)            arch
   CNodeLoadAveGet(node)       loadave
   CNodeIdletimeGet(node)      idletime

SEE ALSO
pbs_sched_basl(8B) pbs_job_attributes(7B), pbs_queue_attributes(7B), pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), pbs_resources_unicos8(7B), pbs_server_attributes(7B), and pbs_server(8B), pbs_resources_irix6(7B), pbs_resources_linux(7B).