119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/****************************************************************************
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* libc/wqueue/work_lock.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <assert.h>
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#include <errno.h>
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#include "wqueue/wqueue.h"
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#if defined(CONFIG_LIB_USRWORK) && !defined(__KERNEL__)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: work_lock
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*
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* Description:
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* Lock the user-mode work queue.
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*
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* Input parameters:
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* None
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*
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* Returned Value:
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* Zero (OK) on success, a negated errno on failure. This error may be
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* reported:
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*
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* -EINTR - Wait was interrupted by a signal
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*
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****************************************************************************/
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int work_lock(void)
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{
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int ret;
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#ifdef CONFIG_BUILD_PROTECTED
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ret = sem_wait(&g_usrsem);
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if (ret < 0)
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{
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DEBUGASSERT(errno == EINTR);
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return -EINTR;
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}
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#else
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ret = pthread_mutex_lock(&g_usrmutex);
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if (ret != 0)
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{
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DEBUGASSERT(ret == EINTR);
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return -EINTR;
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}
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#endif
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return ret;
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}
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/****************************************************************************
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* Name: work_unlock
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*
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* Description:
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* Unlock the user-mode work queue.
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*
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* Input parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void work_unlock(void)
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{
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#ifdef CONFIG_BUILD_PROTECTED
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(void)sem_post(&g_usrsem);
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#else
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(void)pthread_mutex_unlock(&g_usrmutex);
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#endif
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}
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#endif /* CONFIG_LIB_USRWORK && !__KERNEL__*/
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