projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 33574c17 | 1 | /* pthread_once. Generic version. |
| 04277e02 | 2 | Copyright (C) 2002-2019 Free Software Foundation, Inc. |
| 33574c17 ST |
3 | This file is part of the GNU C Library. |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| ad2b41bf ST |
6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 33574c17 ST |
9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| ad2b41bf | 13 | Lesser General Public License for more details. |
| 33574c17 | 14 | |
| ad2b41bf ST |
15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see | |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 33574c17 ST |
18 | |
| 19 | #include <pthread.h> | |
| 20 | #include <atomic.h> | |
| 21 | ||
| 22 | #include <pt-internal.h> | |
| 23 | ||
| 24 | int | |
| 25 | __pthread_once (pthread_once_t *once_control, void (*init_routine) (void)) | |
| 26 | { | |
| 27 | atomic_full_barrier (); | |
| 28 | if (once_control->__run == 0) | |
| 29 | { | |
| 30 | __pthread_spin_lock (&once_control->__lock); | |
| 31 | ||
| 32 | if (once_control->__run == 0) | |
| 33 | { | |
| 34 | init_routine (); | |
| 35 | atomic_full_barrier (); | |
| 36 | once_control->__run = 1; | |
| 37 | } | |
| 38 | ||
| 39 | __pthread_spin_unlock (&once_control->__lock); | |
| 40 | } | |
| 41 | ||
| 42 | return 0; | |
| 43 | } | |
| 44 | strong_alias (__pthread_once, pthread_once); |