#include <db.h> int DB_ENV->mutex_unlock(DB_ENV *dbenv, db_mutex_t mutex);
The DB_ENV->mutex_unlock() method unlocks the mutex locked by
DB_ENV->mutex_lock().
The DB_ENV->mutex_unlock()
method returns a non-zero error value on failure and 0 on success.
The mutex parameter is a mutex previously locked by DB_ENV->mutex_lock().
The DB_ENV->mutex_unlock()
method may fail and return one of the following non-zero errors: