2008-01-30 22:59:12 +01:00
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/****************************************************************************
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2014-08-08 22:21:48 +02:00
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* sched/pthread/pthread_mutexdestroy.c
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2007-02-18 00:21:28 +01:00
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*
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2017-03-26 18:35:23 +02:00
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* Copyright (C) 2007-2009, 2017 Gregory Nutt. All rights reserved.
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2012-07-14 21:30:31 +02:00
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* Author: Gregory Nutt <gnutt@nuttx.org>
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2007-02-18 00:21:28 +01:00
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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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2008-01-30 22:59:12 +01:00
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* 3. Neither the name NuttX nor the names of its contributors may be
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2007-02-18 00:21:28 +01:00
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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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2008-01-30 22:59:12 +01:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2008-01-30 22:59:12 +01:00
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/****************************************************************************
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2007-02-18 00:21:28 +01:00
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* Included Files
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2008-01-30 22:59:12 +01:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2009-12-14 19:39:29 +01:00
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#include <nuttx/config.h>
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2007-02-18 00:21:28 +01:00
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#include <pthread.h>
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#include <semaphore.h>
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2016-12-09 23:53:29 +01:00
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#include <signal.h>
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2007-02-18 00:21:28 +01:00
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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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2012-07-14 21:30:31 +02:00
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2017-03-26 18:35:23 +02:00
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#include <nuttx/semaphore.h>
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2014-08-08 20:55:02 +02:00
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#include "pthread/pthread.h"
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2007-02-18 00:21:28 +01:00
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2008-01-30 22:59:12 +01:00
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/****************************************************************************
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2007-02-18 00:21:28 +01:00
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* Public Functions
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2008-01-30 22:59:12 +01:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2008-01-30 22:59:12 +01:00
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/****************************************************************************
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2012-07-14 21:30:31 +02:00
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* Name: pthread_mutex_destroy
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2007-02-18 00:21:28 +01:00
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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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2008-01-30 22:59:12 +01:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2008-01-30 22:59:12 +01:00
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int pthread_mutex_destroy(FAR pthread_mutex_t *mutex)
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2007-02-18 00:21:28 +01:00
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{
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2017-03-26 18:35:23 +02:00
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int ret = EINVAL;
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2007-02-18 00:21:28 +01:00
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int status;
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2016-06-12 00:42:42 +02:00
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sinfo("mutex=0x%p\n", mutex);
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2017-03-26 18:35:23 +02:00
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DEBUGASSERT(mutex != NULL);
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2007-02-18 00:21:28 +01:00
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2017-03-26 18:35:23 +02:00
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if (mutex != NULL)
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2007-02-18 00:21:28 +01:00
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{
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2017-03-26 18:35:23 +02:00
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/* Make sure the semaphore is stable while we make the following checks */
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2007-02-18 00:21:28 +01:00
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sched_lock();
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2017-03-26 18:35:23 +02:00
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/* Is the mutex available? */
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2007-02-18 00:21:28 +01:00
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2017-03-26 18:35:23 +02:00
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if (mutex->pid >= 0)
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2007-02-18 00:21:28 +01:00
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{
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2017-03-26 18:35:23 +02:00
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DEBUGASSERT(mutex->pid != 0); /* < 0: available, >0 owned, ==0 error */
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/* No.. Verify that the PID still exists. We may be destroying
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* the mutex after cancelling a pthread and the mutex may have
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* been in a bad state owned by the dead pthread. NOTE: The
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* following behavior is unspecified for pthread_mutex_destroy()
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* (see pthread_mutex_consistent()).
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*
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* If the holding thread is still valid, then we should be able to
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* map its PID to the underlying TCB. That is what sched_gettcb()
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* does.
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2016-12-09 23:53:29 +01:00
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*/
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2017-03-26 18:35:23 +02:00
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if (sched_gettcb(mutex->pid) == NULL)
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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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/* Reset the semaphore. If threads are were on this
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* semaphore, then this will awakened them and make
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* destruction of the semaphore impossible here.
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*/
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status = sem_reset((FAR sem_t *)&mutex->sem, 1);
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if (status < 0)
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{
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ret = -status;
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}
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2016-12-09 23:53:29 +01:00
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2017-03-26 18:35:23 +02:00
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/* Check if the reset caused some other thread to lock the
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* mutex.
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*/
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2016-12-09 23:53:29 +01:00
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2017-03-26 18:35:23 +02:00
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else if (mutex->pid != -1)
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{
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/* Yes.. then we cannot destroy the mutex now. */
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2016-12-09 23:53:29 +01:00
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2017-03-26 18:35:23 +02:00
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ret = EBUSY;
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}
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/* Destroy the underlying semaphore */
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else
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{
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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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}
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else
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{
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ret = EBUSY;
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2016-12-09 23:53:29 +01:00
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}
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2007-02-18 00:21:28 +01:00
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}
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else
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{
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2017-03-26 18:35:23 +02:00
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/* Destroy the semaphore
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*
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* REVISIT: What if there are threads waiting on the semaphore?
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* Perhaps this logic should all sem_reset() first?
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*/
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2007-02-18 00:21:28 +01:00
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2015-10-08 03:59:14 +02:00
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status = sem_destroy((FAR sem_t *)&mutex->sem);
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2017-03-26 18:35:23 +02:00
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ret = ((status != OK) ? get_errno() : OK);
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2007-02-18 00:21:28 +01:00
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}
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2012-07-14 21:30:31 +02:00
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2007-02-18 00:21:28 +01:00
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sched_unlock();
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}
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2016-06-12 00:42:42 +02:00
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sinfo("Returning %d\n", ret);
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2007-02-18 00:21:28 +01:00
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return ret;
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}
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