63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
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/* Cancel a thread.
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Copyright (C) 2002-2022 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 <pthread.h>
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#include <pt-internal.h>
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int
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pthread_cancel (pthread_t t)
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{
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int err = 0;
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struct __pthread *p;
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p = __pthread_getid (t);
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if (p == NULL)
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return ESRCH;
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__pthread_mutex_lock (&p->cancel_lock);
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if (p->cancel_pending)
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{
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__pthread_mutex_unlock (&p->cancel_lock);
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return 0;
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}
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p->cancel_pending = 1;
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if (p->cancel_state != PTHREAD_CANCEL_ENABLE)
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{
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__pthread_mutex_unlock (&p->cancel_lock);
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return 0;
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}
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if (p->cancel_type == PTHREAD_CANCEL_ASYNCHRONOUS)
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/* CANCEL_LOCK is unlocked by this call. */
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err = __pthread_do_cancel (p);
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else
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{
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if (p->cancel_hook != NULL)
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/* Thread blocking on a cancellation point. Invoke hook to unblock.
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See __pthread_cond_timedwait_internal. */
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p->cancel_hook (p->cancel_hook_arg);
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__pthread_mutex_unlock (&p->cancel_lock);
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}
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return err;
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}
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