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/* $OpenBSD: rthread_once.c,v 1.3 2017/11/04 22:53:57 jca Exp $ */ |
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/* |
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* Copyright (c) 2004,2005 Ted Unangst <tedu@openbsd.org> |
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* All Rights Reserved. |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <pthread.h> |
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int |
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pthread_once(pthread_once_t *once_control, void (*init_routine)(void)) |
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{ |
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pthread_mutex_lock(&once_control->mutex); |
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if (once_control->state == PTHREAD_NEEDS_INIT) { |
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init_routine(); |
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once_control->state = PTHREAD_DONE_INIT; |
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} |
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pthread_mutex_unlock(&once_control->mutex); |
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return (0); |
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} |