nuttx/sched/pthread/pthread_mutexinconsistent.c

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/****************************************************************************
* sched/pthread/pthread_mutexinconsistent.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <pthread.h>
#include <sched.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/sched.h>
#include <nuttx/semaphore.h>
#include "pthread/pthread.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pthread_mutex_inconsistent
*
* Description:
* This function is called when a pthread is terminated via either
* pthread_exit() or pthread_cancel(). It will check for any mutexes
* held by exitting thread. It will mark them as inconsistent and
* then wake up the highest priority waiter for the mutex. That
* instance of pthread_mutex_lock() will then return EOWNERDEAD.
*
* Input Parameters:
* tcb -- a reference to the TCB of the exitting pthread.
*
* Returned Value:
* None.
*
****************************************************************************/
void pthread_mutex_inconsistent(FAR struct tcb_s *tcb)
{
FAR struct pthread_mutex_s *mutex;
irqstate_t flags;
DEBUGASSERT(tcb != NULL);
sched_lock();
/* Remove and process each mutex held by this task */
while (tcb->mhead != NULL)
{
/* Remove the mutex from the TCB list */
flags = enter_critical_section();
mutex = tcb->mhead;
tcb->mhead = mutex->flink;
mutex->flink = NULL;
leave_critical_section(flags);
/* Mark the mutex as INCONSISTENT and wake up any waiting thread */
mutex->flags |= _PTHREAD_MFLAGS_INCONSISTENT;
pthread_sem_give(&mutex->sem);
}
sched_unlock();
}