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Berkeley DB: DB_ENV->mutex_set_tas_spins
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DB_ENV->mutex_set_tas_spins
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#include <db.h>
int
DB_ENV->mutex_set_tas_spins(DB_ENV *dbenv, u_int32_t tas_spins);
int
DB_ENV->mutex_get_tas_spins(DB_ENV *dbenv, u_int32_t *tas_spinsp);
Description: DB_ENV->mutex_set_tas_spins
Specify that test-and-set mutexes should spin tas_spins times
without blocking. The value defaults to 1 on uniprocessor systems and
to 50 times the number of processors on multiprocessor systems.
The database environment's test-and-set spin count may also be configured using the
environment's DB_CONFIG file. The syntax of the entry in that
file is a single line with the string "set_tas_spins", one or more whitespace
characters, and the number of spins.
Because the DB_CONFIG file is read when the database environment
is opened, it will silently overrule configuration done before that
time.
The DB_ENV->mutex_set_tas_spins method configures operations performed using the specified
DB_ENV handle, not all operations performed on the underlying
database environment.
The DB_ENV->mutex_set_tas_spins method may be called at any time during the life of the
application.
The DB_ENV->mutex_set_tas_spins method
returns a non-zero error value on failure
and 0 on success.
Parameters
tas_spins- The tas_spins parameter is the number of spins test-and-set
mutexes should execute before blocking.
Errors
The DB_ENV->mutex_set_tas_spins 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_get_tas_spins
The DB_ENV->mutex_get_tas_spins method returns the test-and-set spin count.
The DB_ENV->mutex_get_tas_spins method may be called at any time during the life of the
application.
The DB_ENV->mutex_get_tas_spins method
returns a non-zero error value on failure
and 0 on success.
Parameters
tas_spinsp- The DB_ENV->mutex_get_tas_spins method returns the
test-and-set spin count in tas_spinsp.
Class
DB_ENV
See Also
Database Environments and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.