76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/* Wait for thread termination.
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Copyright (C) 2000-2018 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <http://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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/* Make calling thread wait for termination of thread THREAD. Return
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the exit status of the thread in *STATUS. */
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int
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pthread_join (pthread_t thread, void **status)
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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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pthread_cleanup_push ((void (*)(void *)) __pthread_mutex_unlock,
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&pthread->state_lock);
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/* Rely on pthread_cond_wait being a cancellation point to make
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pthread_join one too. */
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while (pthread->state == PTHREAD_JOINABLE)
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__pthread_cond_wait (&pthread->state_cond, &pthread->state_lock);
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pthread_cleanup_pop (0);
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switch (pthread->state)
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{
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case PTHREAD_EXITED:
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/* THREAD has already exited. Salvage its exit status. */
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if (status != NULL)
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*status = pthread->status;
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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_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 join 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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