/** * @file * * @brief Locking and Unlocking a Mutex * @ingroup POSIXAPI */ /* * COPYRIGHT (c) 1989-2007. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.rtems.org/license/LICENSE. */ #if HAVE_CONFIG_H #include "config.h" #endif #include #include /* * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 * * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 */ int pthread_mutex_unlock( pthread_mutex_t *mutex ) { POSIX_Mutex_Control *the_mutex; Thread_queue_Context queue_context; Thread_Control *executing; Status_Control status; the_mutex = _POSIX_Mutex_Get( mutex, &queue_context ); if ( the_mutex == NULL ) { return EINVAL; } executing = _Thread_Executing; switch ( the_mutex->protocol ) { case POSIX_MUTEX_PRIORITY_CEILING: status = _CORE_ceiling_mutex_Surrender( &the_mutex->Mutex, executing, &queue_context ); break; case POSIX_MUTEX_NO_PROTOCOL: status = _CORE_recursive_mutex_Surrender_no_protocol( &the_mutex->Mutex.Recursive, POSIX_MUTEX_NO_PROTOCOL_TQ_OPERATIONS, executing, &queue_context ); break; default: _Assert( the_mutex->protocol == POSIX_MUTEX_PRIORITY_INHERIT ); status = _CORE_recursive_mutex_Surrender( &the_mutex->Mutex.Recursive, executing, &queue_context ); break; } return _POSIX_Get_error( status ); }