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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [posix/] [src/] [mutexsetprioceiling.c] - Rev 532
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/* * $Id: mutexsetprioceiling.c,v 1.2 2001-09-27 11:59:17 chris Exp $ */ #include <assert.h> #include <errno.h> #include <pthread.h> #include <rtems/system.h> #include <rtems/score/coremutex.h> #include <rtems/score/watchdog.h> #if defined(RTEMS_MULTIPROCESSING) #include <rtems/score/mpci.h> #endif #include <rtems/posix/mutex.h> #include <rtems/posix/priority.h> #include <rtems/posix/time.h> /*PAGE * * 13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131 */ int pthread_mutex_setprioceiling( pthread_mutex_t *mutex, int prioceiling, int *old_ceiling ) { register POSIX_Mutex_Control *the_mutex; Objects_Locations location; Priority_Control the_priority; int status; if ( !old_ceiling ) return EINVAL; if ( !_POSIX_Priority_Is_valid( prioceiling ) ) return EINVAL; the_priority = _POSIX_Priority_To_core( prioceiling ); /* * Must acquire the mutex before we can change it's ceiling */ status = pthread_mutex_lock( mutex ); if ( status ) return status; the_mutex = _POSIX_Mutex_Get( mutex, &location ); switch ( location ) { case OBJECTS_REMOTE: #if defined(RTEMS_MULTIPROCESSING) /* XXX It feels questionable to set the ceiling on a remote mutex. */ return EINVAL; #endif case OBJECTS_ERROR: return EINVAL; /* impossible to get here */ case OBJECTS_LOCAL: *old_ceiling = _POSIX_Priority_From_core( the_mutex->Mutex.Attributes.priority_ceiling ); the_mutex->Mutex.Attributes.priority_ceiling = the_priority; _CORE_mutex_Surrender( &the_mutex->Mutex, the_mutex->Object.id, #if defined(RTEMS_MULTIPROCESSING) _POSIX_Threads_mutex_MP_support #else NULL #endif ); _Thread_Enable_dispatch(); return 0; } return POSIX_BOTTOM_REACHED(); }
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