118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/* Wait for thread termination.
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Copyright (C) 2000-2022 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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/* 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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static int
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__pthread_join_common (pthread_t thread, void **status, int try,
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clockid_t clockid,
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const struct timespec *abstime)
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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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if (pthread == _pthread_self ())
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return EDEADLK;
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__pthread_mutex_lock (&pthread->state_lock);
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if (try == 0)
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{
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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 && err != ETIMEDOUT)
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err = __pthread_cond_clockwait (&pthread->state_cond,
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&pthread->state_lock,
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clockid, abstime);
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pthread_cleanup_pop (0);
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}
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switch (pthread->state)
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{
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case PTHREAD_JOINABLE:
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__pthread_mutex_unlock (&pthread->state_lock);
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if (err != ETIMEDOUT)
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err = EBUSY;
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break;
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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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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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int
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__pthread_join (pthread_t thread, void **status)
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{
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return __pthread_join_common (thread, status, 0, CLOCK_REALTIME, NULL);
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}
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weak_alias (__pthread_join, pthread_join);
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int
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__pthread_tryjoin_np (pthread_t thread, void **status)
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{
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return __pthread_join_common (thread, status, 1, CLOCK_REALTIME, NULL);
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}
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weak_alias (__pthread_tryjoin_np, pthread_tryjoin_np);
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int
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__pthread_timedjoin_np (pthread_t thread, void **status,
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const struct timespec *abstime)
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{
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return __pthread_join_common (thread, status, 0, CLOCK_REALTIME, abstime);
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}
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weak_alias (__pthread_timedjoin_np, pthread_timedjoin_np);
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int
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__pthread_clockjoin_np (pthread_t thread, void **status,
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clockid_t clockid,
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const struct timespec *abstime)
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{
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return __pthread_join_common (thread, status, 0, clockid, abstime);
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}
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weak_alias (__pthread_clockjoin_np, pthread_clockjoin_np);
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