# sc::MessageGrp Class Reference

The MessageGrp abstract class provides a mechanism for moving data and objects between nodes in a parallel machine. More...

`#include <message.h>`

Inheritance diagram for sc::MessageGrp:

List of all members.

## Public Member Functions

| MessageGrp (const Ref< KeyVal > &)
int | n ()
| Returns the number of processors.
int | me ()
| Returns my processor number. In the range [0,n()).
virtual Ref< MessageGrp > | clone (void)=0
| Returns a copy of this MessageGrp specialization that provides an independent communication context.
virtual void | send (int target, const double *data, int ndata)
| Send messages sequentially to the target processor.
virtual void | send (int target, const unsigned int *data, int ndata)
virtual void | send (int target, const int *data, int ndata)
virtual void | send (int target, const char *data, int nbyte)
virtual void | send (int target, const unsigned char *data, int nbyte)
virtual void | send (int target, const signed char *data, int nbyte)
virtual void | send (int target, const short *data, int ndata)
virtual void | send (int target, const long *data, int ndata)
virtual void | send (int target, const float *data, int ndata)
void | send (int target, double data)
void | send (int target, int data)
virtual void | raw_send (int target, const void *data, int nbyte)=0
virtual void | sendt (int target, int type, const double *data, int ndata)
| Send typed messages to the target processor.
virtual void | sendt (int target, int type, const unsigned int *data, int ndata)
virtual void | sendt (int target, int type, const int *data, int ndata)
virtual void | sendt (int target, int type, const char *data, int nbyte)
virtual void | sendt (int target, int type, const unsigned char *data, int nbyte)
virtual void | sendt (int target, int type, const signed char *data, int nbyte)
virtual void | sendt (int target, int type, const short *data, int ndata)
virtual void | sendt (int target, int type, const long *data, int ndata)
virtual void | sendt (int target, int type, const float *data, int ndata)
void | sendt (int target, int type, double data)
void | sendt (int target, int type, int data)
virtual void | raw_sendt (int target, int type, const void *data, int nbyte)=0
virtual void | recv (int sender, double *data, int ndata)
| Receive messages sent sequentually from the sender.
virtual void | recv (int sender, unsigned int *data, int ndata)
virtual void | recv (int sender, int *data, int ndata)
virtual void | recv (int sender, char *data, int nbyte)
virtual void | recv (int sender, unsigned char *data, int nbyte)
virtual void | recv (int sender, signed char *data, int nbyte)
virtual void | recv (int sender, short *data, int ndata)
virtual void | recv (int sender, long *data, int ndata)
virtual void | recv (int sender, float *data, int ndata)
void | recv (int sender, double &data)
void | recv (int sender, int &data)
virtual void | raw_recv (int sender, void *data, int nbyte)=0
virtual void | recvt (int type, double *data, int ndata)
| Receive messages sent by type.
virtual void | recvt (int type, unsigned int *data, int ndata)
virtual void | recvt (int type, int *data, int ndata)
virtual void | recvt (int type, char *data, int nbyte)
virtual void | recvt (int type, unsigned char *data, int nbyte)
virtual void | recvt (int type, signed char *data, int nbyte)
virtual void | recvt (int type, short *data, int ndata)
virtual void | recvt (int type, long *data, int ndata)
virtual void | recvt (int type, float *data, int ndata)
void | recvt (int type, double &data)
void | recvt (int type, int &data)
virtual void | raw_recvt (int type, void *data, int nbyte)=0
virtual int | probet (int type)=0
| Ask if a given typed message has been received.
virtual void | bcast (double *data, int ndata, int from=0)
| Do broadcasts of various types of data.
virtual void | bcast (unsigned int *data, int ndata, int from=0)
virtual void | bcast (int *data, int ndata, int from=0)
virtual void | bcast (char *data, int nbyte, int from=0)
virtual void | bcast (unsigned char *data, int nbyte, int from=0)
virtual void | bcast (signed char *data, int nbyte, int from=0)
virtual void | bcast (short *data, int ndata, int from=0)
virtual void | bcast (long *data, int ndata, int from=0)
virtual void | bcast (float *data, int ndata, int from=0)
virtual void | raw_bcast (void *data, int nbyte, int from=0)
void | bcast (double &data, int from=0)
void | bcast (int &data, int from=0)
virtual void | raw_collect (const void *part, const int *lengths, void *whole, int bytes_per_datum=1)
| Collect data distributed on the nodes to a big array replicated on each node.
void | collect (const double *part, const int *lengths, double *whole)
virtual void | sum (double *data, int n, double *=0, int target=-1)
| Global sum reduction.
virtual void | sum (unsigned int *data, int n, unsigned int *=0, int target=-1)
virtual void | sum (int *data, int n, int *=0, int target=-1)
virtual void | sum (char *data, int n, char *=0, int target=-1)
virtual void | sum (unsigned char *data, int n, unsigned char *=0, int target=-1)
virtual void | sum (signed char *data, int n, signed char *=0, int target=-1)
void | sum (double &data)
void | sum (int &data)
virtual void | max (double *data, int n, double *=0, int target=-1)
| Global maximization.
virtual void | max (int *data, int n, int *=0, int target=-1)
virtual void | max (unsigned int *data, int n, unsigned int *=0, int target=-1)
virtual void | max (char *data, int n, char *=0, int target=-1)
virtual void | max (unsigned char *data, int n, unsigned char *=0, int target=-1)
virtual void | max (signed char *data, int n, signed char *=0, int target=-1)
void | max (double &data)
void | max (int &data)
virtual void | min (double *data, int n, double *=0, int target=-1)
| Global minimization.
virtual void | min (int *data, int n, int *=0, int target=-1)
virtual void | min (unsigned int *data, int n, unsigned int *=0, int target=-1)
virtual void | min (char *data, int n, char *=0, int target=-1)
virtual void | min (unsigned char *data, int n, unsigned char *=0, int target=-1)
virtual void | min (signed char *data, int n, signed char *=0, int target=-1)
void | min (double &data)
void | min (int &data)
virtual void | reduce (double *, int n, GrpReduce< double > &, double *scratch=0, int target=-1)
| Global generic reduction.
virtual void | reduce (int *, int n, GrpReduce< int > &, int *scratch=0, int target=-1)
virtual void | reduce (unsigned int *, int n, GrpReduce< unsigned int > &, unsigned int *scratch=0, int target=-1)
virtual void | reduce (char *, int n, GrpReduce< char > &, char *scratch=0, int target=-1)
virtual void | reduce (unsigned char *, int n, GrpReduce< unsigned char > &, unsigned char *scratch=0, int target=-1)
virtual void | reduce (signed char *, int n, GrpReduce< signed char > &, signed char *scratch=0, int target=-1)
virtual void | reduce (short *, int n, GrpReduce< short > &, short *scratch=0, int target=-1)
virtual void | reduce (float *, int n, GrpReduce< float > &, float *scratch=0, int target=-1)
virtual void | reduce (long *, int n, GrpReduce< long > &, long *scratch=0, int target=-1)
void | reduce (double &data, GrpReduce< double > &r)
void | reduce (int &data, GrpReduce< int > &r)
virtual void | sync ()
| Synchronize all of the processors.
Ref< MachineTopology > | topology ()
| Return the MachineTopology object.
int | classdesc_to_index (const ClassDesc *)
| Each message group maintains an association of ClassDesc with a global index so SavableState information can be sent between nodes without needing to send the classname and look up the ClassDesc with each transfer.
const ClassDesc * | index_to_classdesc (int)
int | nclass () const

## Static Public Member Functions

static void | set_default_messagegrp (const Ref< MessageGrp > &)
| The default message group contains the primary message group to be used by an application.
static MessageGrp * | get_default_messagegrp ()
| Returns the default message group.
static MessageGrp * | initial_messagegrp (int &argc, char **&argv)
| Create a message group.

## Protected Member Functions

void | initialize (int me, int n)
| The classdesc_to_index_ and index_to_classdesc_ arrays cannot be initialized by the MessageGrp CTOR, because the MessageGrp specialization has not yet been initialized and communication is not available.

## Protected Attributes

Ref< MachineTopology > | topology_
int | debug_

## Detailed Description

The MessageGrp abstract class provides a mechanism for moving data and objects between nodes in a parallel machine.

## Member Function Documentation

virtual void sc::MessageGrp::bcast | ( | double * | data,
|  | int | ndata,
|  | int | from = `0` |
| ) |  |  | `[virtual]`

Do broadcasts of various types of data.

Similar members exist for each of the basic types.

int sc::MessageGrp::classdesc_to_index | ( | const ClassDesc * |  | ) |

Each message group maintains an association of ClassDesc with a global index so SavableState information can be sent between nodes without needing to send the classname and look up the ClassDesc with each transfer.

These routines return information about that mapping.

virtual Ref<MessageGrp> sc::MessageGrp::clone | ( | void |  | ) | `[pure virtual]`

Returns a copy of this MessageGrp specialization that provides an independent communication context.

Implemented in sc::ProcMessageGrp, sc::MPIMessageGrp, and sc::ShmMessageGrp.

static MessageGrp* sc::MessageGrp::initial_messagegrp | ( | int & | argc,
|  | char **& | argv |
| ) |  |  | `[static]`

Create a message group.

This routine looks for a -messagegrp argument, then the environmental variable MESSAGEGRP to decide which specialization of MessageGrp would be appropriate. The argument to -messagegrp should be either string for a ParsedKeyVal constructor or a classname. If this returns null, it is up to the programmer to create a MessageGrp.

void sc::MessageGrp::initialize | ( | int | me,
|  | int | n |
| ) |  |  | `[protected]`

The classdesc_to_index_ and index_to_classdesc_ arrays cannot be initialized by the MessageGrp CTOR, because the MessageGrp specialization has not yet been initialized and communication is not available.

CTOR's of specializations of MessageGrp must call the initialize member in their body to complete the initialization process.

virtual void sc::MessageGrp::max | ( | double * | data,
|  | int | n,
|  | double * | = `0`,
|  | int | target = `-1` |
| ) |  |  | `[virtual]`

Global maximization.

Similar members exist for each of the basic types.

virtual void sc::MessageGrp::min | ( | double * | data,
|  | int | n,
|  | double * | = `0`,
|  | int | target = `-1` |
| ) |  |  | `[virtual]`

Global minimization.

Similar members exist for each of the basic types.

virtual void sc::MessageGrp::raw_collect | ( | const void * | part,
|  | const int * | lengths,
|  | void * | whole,
|  | int | bytes_per_datum = `1` |
| ) |  |  | `[virtual]`

Collect data distributed on the nodes to a big array replicated on each node.

virtual void sc::MessageGrp::recv | ( | int | sender,
|  | double * | data,
|  | int | ndata |
| ) |  |  | `[virtual]`

Receive messages sent sequentually from the sender.

Similar members exist for each of the basic types.

virtual void sc::MessageGrp::recvt | ( | int | type,
|  | double * | data,
|  | int | ndata |
| ) |  |  | `[virtual]`

Receive messages sent by type.

Similar members exist for each of the basic types.

virtual void sc::MessageGrp::reduce | ( | double * | ,
|  | int | n,
|  | GrpReduce< double > & | ,
|  | double * | scratch = `0`,
|  | int | target = `-1` |
| ) |  |  | `[virtual]`

Global generic reduction.

Similar members exist for each of the basic types.

Reimplemented in sc::MPIMessageGrp.

virtual void sc::MessageGrp::send | ( | int | target,
|  | const double * | data,
|  | int | ndata |
| ) |  |  | `[virtual]`

Send messages sequentially to the target processor.

Similar members exist for each of the basic types.

virtual void sc::MessageGrp::sendt | ( | int | target,
|  | int | type,
|  | const double * | data,
|  | int | ndata |
| ) |  |  | `[virtual]`

Send typed messages to the target processor.

Similar members exist for each of the basic types.

static void sc::MessageGrp::set_default_messagegrp | ( | const Ref< MessageGrp > & |  | ) | `[static]`

The default message group contains the primary message group to be used by an application.

virtual void sc::MessageGrp::sum | ( | double * | data,
|  | int | n,
|  | double * | = `0`,
|  | int | target = `-1` |
| ) |  |  | `[virtual]`

Global sum reduction.

Similar members exist for each of the basic types.

Reimplemented in sc::MPIMessageGrp.

The documentation for this class was generated from the following file:

- message.h