#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 may not be called before the DB_ENV->open method is called.

The DB_ENV->mutex_lock method returns a non-zero error value on failure and 0 on success.

• The mutex parameter is a mutex previously allocated by DB_ENV->mutex_alloc.

The DB_ENV->mutex_lock method may fail and return one of the following non-zero errors:

• An invalid flag value or parameter was specified.