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55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* Copyright (C) 2002-2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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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<http://www.gnu.org/licenses/>. */
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#include "pthreadP.h"
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#include <lowlevellock.h>
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static int once_lock = LLL_LOCK_INITIALIZER;
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int
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__pthread_once (once_control, init_routine)
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pthread_once_t *once_control;
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void (*init_routine) (void);
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{
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/* XXX Depending on whether the LOCK_IN_ONCE_T is defined use a
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global lock variable or one which is part of the pthread_once_t
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object. */
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if (*once_control == PTHREAD_ONCE_INIT)
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{
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lll_lock (once_lock, LLL_PRIVATE);
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/* XXX This implementation is not complete. It doesn't take
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cancelation and fork into account. */
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if (*once_control == PTHREAD_ONCE_INIT)
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{
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init_routine ();
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*once_control = !PTHREAD_ONCE_INIT;
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}
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lll_unlock (once_lock, LLL_PRIVATE);
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}
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return 0;
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}
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strong_alias (__pthread_once, pthread_once)
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hidden_def (__pthread_once)
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