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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [rtems/] [src/] [semobtain.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: semobtain.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_obtain * * This directive allows a thread to acquire a semaphore. * * Input parameters: * id - semaphore id * option_set - wait option * timeout - number of ticks to wait (0 means wait forever) * * Output parameters: * RTEMS_SUCCESSFUL - if successful * error code - if unsuccessful */ rtems_status_code rtems_semaphore_obtain( Objects_Id id, unsigned32 option_set, rtems_interval timeout ) { register Semaphore_Control *the_semaphore; Objects_Locations location; boolean wait; the_semaphore = _Semaphore_Get( id, &location ); switch ( location ) { case OBJECTS_REMOTE: #if defined(RTEMS_MULTIPROCESSING) return _Semaphore_MP_Send_request_packet( SEMAPHORE_MP_OBTAIN_REQUEST, id, option_set, timeout ); #endif case OBJECTS_ERROR: return RTEMS_INVALID_ID; case OBJECTS_LOCAL: if ( _Options_Is_no_wait( option_set ) ) wait = FALSE; else wait = TRUE; if ( !_Attributes_Is_counting_semaphore(the_semaphore->attribute_set) ) { _CORE_mutex_Seize( &the_semaphore->Core_control.mutex, id, wait, timeout ); _Thread_Enable_dispatch(); return _Semaphore_Translate_core_mutex_return_code( _Thread_Executing->Wait.return_code ); } else { _CORE_semaphore_Seize( &the_semaphore->Core_control.semaphore, id, wait, timeout ); _Thread_Enable_dispatch(); return _Semaphore_Translate_core_semaphore_return_code( _Thread_Executing->Wait.return_code ); } } return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ }
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