| /* Copyright (C) 2002-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "pthreadP.h" |
| #include <lowlevellock.h> |
| |
| |
| |
| static int once_lock = LLL_LOCK_INITIALIZER; |
| |
| |
| int |
| __pthread_once (once_control, init_routine) |
| 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) |
| hidden_def (__pthread_once) |
