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