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/**
* @file
*
* @ingroup POSIX_SEMAPHORE
*
* @brief Get the Value of a Semaphore
*/
/*
* COPYRIGHT (c) 1989-2014.
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/posix/semaphoreimpl.h>
int sem_getvalue(
sem_t *__restrict _sem,
int *__restrict sval
)
{
Sem_Control *sem;
ISR_Level level;
Thread_queue_Context queue_context;
POSIX_SEMAPHORE_VALIDATE_OBJECT( _sem );
sem = _Sem_Get( &_sem->_Semaphore );
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_ISR_disable( &queue_context, level );
_Sem_Queue_acquire_critical( sem, &queue_context );
*sval = (int) sem->count;
_Sem_Queue_release( sem, level, &queue_context );
return 0;
}
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