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Berkeley DB: DB_ENV->mutex_stat
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DB_ENV->mutex_stat
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#include <db.h>
int
DB_ENV->mutex_stat(DB_ENV *env, DB_MUTEX_STAT **statp, u_int32_t flags);
int
DB_ENV->mutex_stat_print(DB_ENV *env, u_int32_t flags);
Description: DB_ENV->mutex_stat
The DB_ENV->mutex_stat method returns the mutex subsystem statistics.
The DB_ENV->mutex_stat method creates a statistical structure of type
DB_MUTEX_STAT and copies a pointer to it into a user-specified memory
location.
Statistical structures are stored in allocated memory. If application-specific allocation
routines have been declared (see DB_ENV->set_alloc for more
information), they are used to allocate the memory; otherwise, the
standard C library 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 following DB_MUTEX_STAT fields will be filled in:
u_int32_t st_mutex_align;- The mutex alignment, in bytes.
u_int32_t st_mutex_tas_spins;- The number of times test-and-set mutexes will spin without blocking.
int st_mutex_cnt;- The total number of mutexes configured.
u_int32_t st_mutex_free;- The number of mutexes currently available.
u_int32_t st_mutex_inuse;- The number of mutexes currently in use.
u_int32_t st_mutex_inuse_max;- The maximum number of mutexes ever in use.
roff_t st_regsize;- The size of the mutex region, in bytes.
u_int32_t st_region_wait;- The number of times that a thread of control was forced to wait before
obtaining the mutex region mutex.
u_int32_t st_region_nowait;- The number of times that a thread of control was able to obtain
the mutex region mutex without waiting.
The DB_ENV->mutex_stat method may not be called before the DB_ENV->open method is called.
The DB_ENV->mutex_stat method
returns a non-zero error value on failure
and 0 on success.
Parameters
flags- The flags parameter must be set to 0 or
the following value:
DB_STAT_CLEAR- Reset statistics after returning their values.
statp- The statp parameter references memory into which
a pointer to the allocated statistics structure is copied.
Errors
The DB_ENV->mutex_stat method
may fail and return one of the following non-zero errors:
EINVAL- An
invalid flag value or parameter was specified.
Description: DB_ENV->mutex_stat_print
The DB_ENV->mutex_stat_print method displays the
mutex subsystem statistical information, as described for the DB_ENV->mutex_stat method.
The information is printed to a specified output channel (see the
DB_ENV->set_msgfile method for more information), or passed to an
application callback function (see the DB_ENV->set_msgcall method for
more information).
The DB_ENV->mutex_stat_print method may not be called before the DB_ENV->open method is called.
The DB_ENV->mutex_stat_print method
returns a non-zero error value on failure
and 0 on success.
Parameters
flags- The flags parameter must be set to 0 or by bitwise inclusively OR'ing together one
or more of the following values:
DB_STAT_ALL- Display all available information.
DB_STAT_CLEAR- Reset statistics after displaying their values.
Class
DB_ENV
See Also
Database Environments and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.