DB_ENV->set_tas_spins(DB_ENV *dbenv, u_int32_t 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 DB_ENV->set_tas_spins method configures operations performed using the specified
DB_ENV handle, not all operations performed on the underlying
The DB_ENV->set_tas_spins interface may be called at any time during the life of
The DB_ENV->set_tas_spins method returns a non-zero error value on failure and 0 on success.
The database environment's test-and-set spin count may also be set 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->set_tas_spins method may fail and return a non-zero error for the following conditions:
- An invalid flag value or parameter was specified.
The DB_ENV->set_tas_spins method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the DB_ENV->set_tas_spins method may fail and
in which case all subsequent Berkeley DB calls will fail in the same way.
Database Environments and Related Methods
Copyright Sleepycat Software