103 lines
3.7 KiB
C
103 lines
3.7 KiB
C
/****************************************************************************
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* sched/pthread/pthread_mutexinconsistent.c
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*
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* Copyright (C) 2017 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 <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/sched.h>
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#include <nuttx/semaphore.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_inconsistent
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*
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* Description:
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* This function is called when a pthread is terminated via either
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* pthread_exit() or pthread_cancel(). It will check for any mutexes
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* held by exitting thread. It will mark them as inconsistent and
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* then wake up the highest priority waiter for the mutex. That
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* instance of pthread_mutex_lock() will then return EOWNERDEAD.
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*
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* Input Parameters:
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* tcb -- a reference to the TCB of the exitting pthread.
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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 pthread_mutex_inconsistent(FAR struct pthread_tcb_s *tcb)
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{
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FAR struct pthread_mutex_s *mutex;
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irqstate_t flags;
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DEBUGASSERT(tcb != NULL);
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sched_lock();
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/* Remove and process each mutex from the list of mutexes held by this task */
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while (tcb->mhead != NULL)
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{
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/* Remove the mutex from the TCB list */
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flags = enter_critical_section();
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mutex = tcb->mhead;
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tcb->mhead = mutex->flink;
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mutex->flink = NULL;
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leave_critical_section(flags);
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/* Mark the mutex as INCONSISTENT and wake up any waiting thread */
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mutex->flags |= _PTHREAD_MFLAGS_INCONSISTENT;
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pthread_sem_give(&mutex->sem);
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}
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sched_unlock();
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}
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