127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
/****************************************************************************
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* sched/pthread/pthread_detach.c
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*
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* Copyright (C) 2007, 2009, 2013 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 <sys/types.h>
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#include <stdbool.h>
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#include <pthread.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include "sched/sched.h"
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#include "group/group.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_detach
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*
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* Description:
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* A thread object may be "detached" to specify that the return value
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* and completion status will not be requested.
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*
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* The caller's task/thread must belong to the same "task group" as the
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* pthread is (or was) a member of. The thread may or may not still
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* be running.
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*
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* Parameters:
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* thread
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*
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* Return Value:
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* 0 if successful. Otherwise, an error code.
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*
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* Assumptions:
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*
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****************************************************************************/
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int pthread_detach(pthread_t thread)
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{
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FAR struct tcb_s *rtcb = this_task();
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FAR struct task_group_s *group = rtcb->group;
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FAR struct join_s *pjoin;
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int ret;
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sdbg("Thread=%d group=%p\n", thread, group);
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DEBUGASSERT(group);
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/* Find the entry associated with this pthread. */
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(void)pthread_takesemaphore(&group->tg_joinsem);
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pjoin = pthread_findjoininfo(group, (pid_t)thread);
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if (!pjoin)
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{
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sdbg("Could not find thread entry\n");
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ret = EINVAL;
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}
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else
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{
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/* Has the thread already terminated? */
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if (pjoin->terminated)
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{
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/* YES.. just remove the thread entry. */
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pthread_destroyjoin(group, pjoin);
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}
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else
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{
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/* NO.. Just mark the thread as detached. It
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* will be removed and deallocated when the
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* thread exits
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*/
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pjoin->detached = true;
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}
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/* Either case is successful */
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ret = OK;
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}
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(void)pthread_givesemaphore(&group->tg_joinsem);
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sdbg("Returning %d\n", ret);
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return ret;
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}
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