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/* Copyright (C) 2002-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include "pthreadP.h"
#include <atomic.h>
int
pthread_detach (pthread_t th)
{
struct pthread *pd = (struct pthread *) th;
/* Make sure the descriptor is valid. */
if (INVALID_NOT_TERMINATED_TD_P (pd))
/* Not a valid thread handle. */
return ESRCH;
int result = 0;
/* Mark the thread as detached. */
if (atomic_compare_and_exchange_bool_acq (&pd->joinid, pd, NULL))
{
/* There are two possibilities here. First, the thread might
already be detached. In this case we return EINVAL.
Otherwise there might already be a waiter. The standard does
not mention what happens in this case. */
if (IS_DETACHED (pd))
result = EINVAL;
}
else
/* Check whether the thread terminated meanwhile. In this case we
will just free the TCB. */
if ((pd->cancelhandling & EXITING_BITMASK) != 0)
/* Note that the code in __free_tcb makes sure each thread
control block is freed only once. */
__free_tcb (pd);
return result;
}
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