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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [rtems/] [src/] [semrelease.c] - Rev 751
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/* * Semaphore Manager * * DESCRIPTION: * * This package is the implementation of the Semaphore Manager. * This manager utilizes standard Dijkstra counting semaphores to provide * synchronization and mutual exclusion capabilities. * * Directives provided are: * * + create a semaphore * + get an ID of a semaphore * + delete a semaphore * + acquire a semaphore * + release a semaphore * * COPYRIGHT (c) 1989-1999. * 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.OARcorp.com/rtems/license.html. * * $Id: semrelease.c,v 1.2 2001-09-27 11:59:19 chris Exp $ */ #include <rtems/system.h> #include <rtems/rtems/status.h> #include <rtems/rtems/support.h> #include <rtems/rtems/attr.h> #include <rtems/score/isr.h> #include <rtems/score/object.h> #include <rtems/rtems/options.h> #include <rtems/rtems/sem.h> #include <rtems/score/coremutex.h> #include <rtems/score/coresem.h> #include <rtems/score/states.h> #include <rtems/score/thread.h> #include <rtems/score/threadq.h> #if defined(RTEMS_MULTIPROCESSING) #include <rtems/score/mpci.h> #endif #include <rtems/score/sysstate.h> #include <rtems/score/interr.h> /*PAGE * * rtems_semaphore_release * * This directive allows a thread to release a semaphore. * * Input parameters: * id - semaphore id * * Output parameters: * RTEMS_SUCCESSFUL - if successful * error code - if unsuccessful */ rtems_status_code rtems_semaphore_release( Objects_Id id ) { register Semaphore_Control *the_semaphore; Objects_Locations location; CORE_mutex_Status mutex_status; CORE_semaphore_Status semaphore_status; the_semaphore = _Semaphore_Get( id, &location ); switch ( location ) { case OBJECTS_REMOTE: #if defined(RTEMS_MULTIPROCESSING) return _Semaphore_MP_Send_request_packet( SEMAPHORE_MP_RELEASE_REQUEST, id, 0, /* Not used */ MPCI_DEFAULT_TIMEOUT ); #endif case OBJECTS_ERROR: return RTEMS_INVALID_ID; case OBJECTS_LOCAL: if ( !_Attributes_Is_counting_semaphore(the_semaphore->attribute_set) ) { mutex_status = _CORE_mutex_Surrender( &the_semaphore->Core_control.mutex, id, #if defined(RTEMS_MULTIPROCESSING) _Semaphore_Core_mutex_mp_support #else NULL #endif ); _Thread_Enable_dispatch(); return _Semaphore_Translate_core_mutex_return_code( mutex_status ); } else semaphore_status = _CORE_semaphore_Surrender( &the_semaphore->Core_control.semaphore, id, #if defined(RTEMS_MULTIPROCESSING) _Semaphore_Core_semaphore_mp_support #else NULL #endif ); _Thread_Enable_dispatch(); return _Semaphore_Translate_core_semaphore_return_code( semaphore_status ); } return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ }
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