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94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/* Copyright (C) 2003-2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
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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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unsigned long int __fork_generation attribute_hidden;
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static void
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clear_once_control (void *arg)
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{
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pthread_once_t *once_control = (pthread_once_t *) arg;
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*once_control = 0;
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lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
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}
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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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while (1)
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{
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int oldval, val, newval;
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val = *once_control;
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do
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{
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/* Check if the initialized has already been done. */
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if ((val & 2) != 0)
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return 0;
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oldval = val;
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newval = (oldval & 3) | __fork_generation | 1;
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val = atomic_compare_and_exchange_val_acq (once_control, newval,
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oldval);
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}
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while (__builtin_expect (val != oldval, 0));
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/* Check if another thread already runs the initializer. */
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if ((oldval & 1) != 0)
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{
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/* Check whether the initializer execution was interrupted
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by a fork. */
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if (((oldval ^ newval) & -4) == 0)
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{
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/* Same generation, some other thread was faster. Wait. */
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lll_futex_wait (once_control, newval, LLL_PRIVATE);
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continue;
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}
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}
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/* This thread is the first here. Do the initialization.
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Register a cleanup handler so that in case the thread gets
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interrupted the initialization can be restarted. */
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pthread_cleanup_push (clear_once_control, once_control);
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init_routine ();
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pthread_cleanup_pop (0);
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/* Add one to *once_control. */
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atomic_increment (once_control);
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/* Wake up all other threads. */
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lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
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break;
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}
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return 0;
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}
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weak_alias (__pthread_once, pthread_once)
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hidden_def (__pthread_once)
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