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- /* Copyright (C) 2002, 2007 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #include "pthreadP.h"
- #include <lowlevellock.h>
- static int once_lock = LLL_LOCK_INITIALIZER;
- int
- __pthread_once (
- pthread_once_t *once_control,
- void (*init_routine) (void))
- {
- /* XXX Depending on whether the LOCK_IN_ONCE_T is defined use a
- global lock variable or one which is part of the pthread_once_t
- object. */
- if (*once_control == PTHREAD_ONCE_INIT)
- {
- lll_lock (once_lock, LLL_PRIVATE);
- /* XXX This implementation is not complete. It doesn't take
- cancelation and fork into account. */
- if (*once_control == PTHREAD_ONCE_INIT)
- {
- init_routine ();
- *once_control = !PTHREAD_ONCE_INIT;
- }
- lll_unlock (once_lock, LLL_PRIVATE);
- }
- return 0;
- }
- strong_alias (__pthread_once, pthread_once)
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