135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/****************************************************************************
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* sched/pthread/pthread_mutexdestroy.c
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*
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* Copyright (C) 2007-2009 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 <signal.h>
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#include <sched.h>
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#include <errno.h>
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#include <debug.h>
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#include "pthread/pthread.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_mutex_destroy
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*
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* Description:
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* Destroy a mutex.
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*
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* Parameters:
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* None
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*
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* Return Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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int pthread_mutex_destroy(FAR pthread_mutex_t *mutex)
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{
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int ret = OK;
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int status;
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sinfo("mutex=0x%p\n", mutex);
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if (mutex == NULL)
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{
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ret = EINVAL;
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}
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else
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{
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/* Make sure the semaphore is stable while we make the following
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* checks
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*/
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sched_lock();
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/* Is the semaphore available? */
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if (mutex->pid != -1)
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{
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#ifndef CONFIG_DISABLE_SIGNALS
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/* Verify that the PID still exists. We may be destroying the
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* mutex after cancelling a pthread and the mutex may have been
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* in a bad state owned by the dead pthread.
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*/
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ret = kill(mutex->pid, 0);
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if (ret < 0)
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{
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/* The thread associated with the PID no longer exists */
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mutex->pid = -1;
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/* Destroy the semaphore */
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status = sem_destroy((FAR sem_t *)&mutex->sem);
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ret = (status != OK) ? get_errno() : OK;
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}
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else
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#endif
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{
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ret = EBUSY;
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}
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}
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else
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{
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/* Destroy the semaphore */
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status = sem_destroy((FAR sem_t *)&mutex->sem);
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if (status != OK)
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{
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ret = get_errno();
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}
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}
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sched_unlock();
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}
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sinfo("Returning %d\n", ret);
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return ret;
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}
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