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1 | /* Copyright (C) 2002 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
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. | |
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 | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include "pthreadP.h" | |
21 | #include <lowlevellock.h> | |
22 | ||
23 | ||
24 | ||
25 | static lll_lock_t once_lock = LLL_LOCK_INITIALIZER; | |
26 | ||
27 | ||
28 | int | |
29 | __pthread_once (once_control, init_routine) | |
30 | pthread_once_t *once_control; | |
31 | void (*init_routine) (void); | |
32 | { | |
33 | /* XXX Depending on whether the LOCK_IN_ONCE_T is defined use a | |
34 | global lock variable or one which is part of the pthread_once_t | |
35 | object. */ | |
36 | if (*once_control == PTHREAD_ONCE_INIT) | |
37 | { | |
38 | lll_lock (once_lock); | |
39 | ||
40 | /* XXX This implementation is not complete. It doesn't take | |
41 | cancelation and fork into account. */ | |
42 | if (*once_control == PTHREAD_ONCE_INIT) | |
43 | { | |
44 | init_routine (); | |
45 | ||
46 | *once_control = !PTHREAD_ONCE_INIT; | |
47 | } | |
48 | ||
49 | lll_unlock (once_lock); | |
50 | } | |
51 | ||
52 | return 0; | |
53 | } | |
54 | strong_alias (__pthread_once, pthread_once) |