nuttx/sched/pthread/pthread_exit.c

/****************************************************************************
 * sched/pthread/pthread_exit.c
 *
 *   Copyright (C) 2007, 2009, 2011-2013, 2017 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <pthread.h>
#include <errno.h>
#include <debug.h>

#include <nuttx/arch.h>
#include <nuttx/signal.h>

#include "sched/sched.h"
#include "task/task.h"
#include "pthread/pthread.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: pthread_exit
 *
 * Description:
 *   Terminate execution of a thread started with pthread_create.
 *
 * Input Parameters:
 *   exit_valie
 *
 * Returned Value:
 *   None
 *
 * Assumptions:
 *
 ****************************************************************************/

void pthread_exit(FAR void *exit_value)
{
  FAR struct tcb_s *tcb = this_task();
  sigset_t set = ALL_SIGNAL_SET;
  int status;

  sinfo("exit_value=%p\n", exit_value);

  DEBUGASSERT(tcb != NULL);
  DEBUGASSERT((tcb->flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_PTHREAD);

  /* Block any signal actions that would awaken us while were
   * are performing the JOIN handshake.
   */

  (void)nxsig_procmask(SIG_SETMASK, &set, NULL);

#ifdef CONFIG_CANCELLATION_POINTS
  /* Mark the pthread as non-cancelable to avoid additional calls to
   * pthread_exit() due to any cancellation point logic that might get
   * kicked off by actions taken during pthread_exit processing.
   */

  tcb->flags  |=  TCB_FLAG_NONCANCELABLE;
  tcb->flags  &= ~TCB_FLAG_CANCEL_PENDING;
  tcb->cpcount = 0;
#endif

#ifdef CONFIG_PTHREAD_CLEANUP
  /* Perform any stack pthread clean-up callbacks */

  pthread_cleanup_popall((FAR struct pthread_tcb_s *)tcb);
#endif

  /* Complete pending join operations */

  status = pthread_completejoin(getpid(), exit_value);
  if (status != OK)
    {
      /* Assume that the join completion failured because this
       * not really a pthread.  Exit by calling exit().
       */

      exit(EXIT_FAILURE);
    }

#ifndef CONFIG_PTHREAD_MUTEX_UNSAFE
  /* Recover any mutexes still held by the canceled thread */

  pthread_mutex_inconsistent((FAR struct pthread_tcb_s *)tcb);
#endif

  /* Perform common task termination logic.  This will get called again later
   * through logic kicked off by _exit().  However, we need to call it before
   * calling _exit() in order certain operations if this is the last thread
   * of a task group:  (2) To handle atexit() and on_exit() callbacks and
   * (2) so that we can flush buffered I/O (which may required suspending).
   */

  nxtask_exithook(tcb, EXIT_SUCCESS, false);

  /* Then just exit, retaining all file descriptors and without
   * calling atexit() functions.
   */

  _exit(EXIT_SUCCESS);
}