# DbEnv::lock_stat

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    #include <db_cxx.h>

    int
    DbEnv::lock_stat(DB_LOCK_STAT **statp);

# Description

The DbEnv::lock_stat method creates a statistical structure and copies a pointer to it into a user-specified memory location.

Statistical structures are created in allocated memory. If application-specific allocation routines have been declared (see DbEnv::set_alloc for more information), they are used to allocate the memory; otherwise, the library function malloc(3) is used. The caller is responsible for deallocating the memory. To deallocate the memory, free the memory reference; references inside the returned memory need not be individually freed.

The lock region statistics are stored in a structure of type DB_LOCK_STAT. The following DB_LOCK_STAT fields will be filled in:

u_int32_t st_lastid;
  The last allocated lock ID.
u_int32_t st_nmodes;
  The number of lock modes.
u_int32_t st_maxlocks;
  The maximum number of locks possible.
u_int32_t st_maxlockers;
  The maximum number of lockers possible.
u_int32_t st_maxobjects;
  The maximum number of objects possible.
u_int32_t st_nlocks;
  The number of current locks.
u_int32_t st_maxnlocks;
  The maximum number of locks at any one time.
u_int32_t st_nlockers;
  The number of current lockers.
u_int32_t st_maxnlockers;
  The maximum number of lockers at any one time.
u_int32_t st_nobjects;
  The number of current objects.
u_int32_t st_maxnobjects;
  The maximum number of objects at any one time.
u_int32_t st_nrequests;
  The total number of locks requested.
u_int32_t st_nreleases;
  The total number of locks released.
u_int32_t st_nnowaits;
  The total number of lock requests that failed because DB_LOCK_NOWAIT was set.
u_int32_t st_nconflicts;
  The total number of locks not immediately available due to conflicts.
u_int32_t st_ndeadlocks;
  The number of deadlocks detected.
u_int32_t st_regsize;
  The size of the region.
u_int32_t st_region_wait;
  The number of times that a thread of control was forced to wait before obtaining the region lock.
u_int32_t st_region_nowait;
  The number of times that a thread of control was able to obtain the region lock without waiting.

The DbEnv::lock_stat method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

# Errors

The DbEnv::lock_stat method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the DbEnv::lock_stat method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DbEnv, DbLock

# See Also

DbEnv::set_lk_conflicts, DbEnv::set_lk_detect, DbEnv::set_lk_max, DbEnv::set_lk_max_lockers, DbEnv::set_lk_max_locks, DbEnv::set_lk_max_objects, DbEnv::lock_detect, DbEnv::lock_get, DbEnv::lock_id, DbLock::put, DbEnv::lock_stat, and DbEnv::lock_vec.`

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