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62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup POSIX_SEMAPHORE
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*
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* @brief Get the Value of a Semaphore
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*/
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/*
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* COPYRIGHT (c) 1989-2014.
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* On-Line Applications Research Corporation (OAR).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/posix/semaphoreimpl.h>
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int sem_getvalue(
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sem_t *__restrict _sem,
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int *__restrict sval
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)
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{
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Sem_Control *sem;
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ISR_Level level;
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Thread_queue_Context queue_context;
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POSIX_SEMAPHORE_VALIDATE_OBJECT( _sem );
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sem = _Sem_Get( &_sem->_Semaphore );
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_Thread_queue_Context_initialize( &queue_context );
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_Thread_queue_Context_ISR_disable( &queue_context, level );
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_Sem_Queue_acquire_critical( sem, &queue_context );
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*sval = (int) sem->count;
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_Sem_Queue_release( sem, level, &queue_context );
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return 0;
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}
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