source: rtems/cpukit/posix/src/pthreadjoin.c

/* SPDX-License-Identifier: BSD-2-Clause */

/**
 * @file
 *
 * @ingroup POSIXAPI
 *
 * @brief Suspends Execution of Calling Thread until Target Thread Terminates 
 */

/*
 *  16.1.3 Wait for Thread Termination, P1003.1c/Draft 10, p. 147
 *
 *  COPYRIGHT (c) 1989-2014.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  Copyright (c) 2016 embedded brains GmbH & Co. KG
 *
 * 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.
 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <pthread.h>
#include <errno.h>

#include <rtems/posix/threadsup.h>
#include <rtems/posix/posixapi.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/statesimpl.h>

static int _POSIX_Threads_Join( pthread_t thread, void **value_ptr )
{
  Thread_Control       *the_thread;
  Thread_queue_Context  queue_context;
  Thread_Control       *executing;
  Status_Control        status;

  _Thread_queue_Context_initialize( &queue_context );
  the_thread = _Thread_Get( thread, &queue_context.Lock_context.Lock_context );

  if ( the_thread == NULL ) {
    return ESRCH;
  }

  _Thread_State_acquire_critical(
    the_thread,
    &queue_context.Lock_context.Lock_context
  );

  if ( !_Thread_Is_joinable( the_thread ) ) {
    _Thread_State_release( the_thread, &queue_context.Lock_context.Lock_context );
    return EINVAL;
  }

  executing = _Thread_Executing;
  status = _Thread_Join(
    the_thread,
    STATES_INTERRUPTIBLE_BY_SIGNAL | STATES_WAITING_FOR_JOIN,
    executing,
    &queue_context
  );

  if ( status != STATUS_SUCCESSFUL ) {
    return _POSIX_Get_error( status );
  }

  if ( value_ptr != NULL ) {
    *value_ptr = executing->Wait.return_argument;
  }

  return 0;
}

int pthread_join( pthread_t thread, void **value_ptr )
{
  int error;

  do {
    error = _POSIX_Threads_Join( thread, value_ptr );
  } while ( error == EINTR );

  return error;
}