DB_ENV->mutex_lock()
#include <db.h>
int
DB_ENV->mutex_lock(DB_ENV *dbenv, db_mutex_t mutex); The DB_ENV->mutex_lock() method locks the mutex allocated by DB_ENV->mutex_alloc(). The thread of control calling DB_ENV->mutex_lock() will block until the lock is available.
The DB_ENV->mutex_lock() method returns a non-zero error value on failure and 0 on success.
Parameters
mutex
The mutex parameter is a mutex previously allocated by DB_ENV->mutex_alloc().
Errors
The DB_ENV->mutex_lock() method may fail and return one of the following non-zero errors:
EINVAL
An invalid flag value or parameter was specified.