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82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/* Detach a thread.
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Copyright (C) 2000-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <pthread.h>
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#include <stddef.h>
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#include <pt-internal.h>
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/* Indicate that the storage for THREAD can be reclaimed when it
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terminates. */
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int
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__pthread_detach (pthread_t thread)
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{
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struct __pthread *pthread;
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int err = 0;
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/* Lookup the thread structure for THREAD. */
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pthread = __pthread_getid (thread);
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if (pthread == NULL)
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return ESRCH;
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__pthread_mutex_lock (&pthread->state_lock);
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switch (pthread->state)
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{
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case PTHREAD_JOINABLE:
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/* THREAD still running. Mark it as detached such that its
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resources can be reclaimed as soon as the thread exits. */
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pthread->state = PTHREAD_DETACHED;
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/* Broadcast the condition. This will make threads that are
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waiting to join THREAD continue with hopefully disastrous
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consequences instead of blocking indefinitely. */
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__pthread_cond_broadcast (&pthread->state_cond);
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__pthread_mutex_unlock (&pthread->state_lock);
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__pthread_dealloc (pthread);
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break;
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case PTHREAD_EXITED:
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__pthread_mutex_unlock (&pthread->state_lock);
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/* THREAD has already exited. PTHREAD remained after the thread
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exited in order to provide the exit status, but it turns out
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it won't be needed. */
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__pthread_dealloc (pthread);
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break;
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case PTHREAD_TERMINATED:
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/* Pretend THREAD wasn't there in the first place. */
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__pthread_mutex_unlock (&pthread->state_lock);
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err = ESRCH;
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break;
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default:
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/* Thou shalt not detach non-joinable threads! */
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__pthread_mutex_unlock (&pthread->state_lock);
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err = EINVAL;
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break;
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}
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return err;
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}
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weak_alias (__pthread_detach, pthread_detach)
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hidden_def (__pthread_detach)
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