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author | RincewindsHat <12514511+RincewindsHat@users.noreply.github.com> | 2023-02-19 13:39:08 (GMT) |
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committer | RincewindsHat <12514511+RincewindsHat@users.noreply.github.com> | 2023-02-19 13:39:08 (GMT) |
commit | 74b6984047d330a3cc7cb7f63645849fe7676c63 (patch) | |
tree | 65a26800103d8d66f7e6cb4acfbfc9f315ec750b /gl/windows-once.c | |
parent | 423284edfa980fc3fdb51ab20af96685a988ba97 (diff) | |
parent | c07206f2ccc2356aa74bc6813a94c2190017d44e (diff) | |
download | monitoring-plugins-74b6984047d330a3cc7cb7f63645849fe7676c63.tar.gz |
Merge branch 'master' into check_icmp_cleanuprefs/pull/1807/head
Diffstat (limited to 'gl/windows-once.c')
-rw-r--r-- | gl/windows-once.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/gl/windows-once.c b/gl/windows-once.c new file mode 100644 index 0000000..0d28281 --- /dev/null +++ b/gl/windows-once.c | |||
@@ -0,0 +1,62 @@ | |||
1 | /* Once-only control (native Windows implementation). | ||
2 | Copyright (C) 2005-2023 Free Software Foundation, Inc. | ||
3 | |||
4 | This file is free software: you can redistribute it and/or modify | ||
5 | it under the terms of the GNU Lesser General Public License as | ||
6 | published by the Free Software Foundation; either version 2.1 of the | ||
7 | License, or (at your option) any later version. | ||
8 | |||
9 | This file is distributed in the hope that it will be useful, | ||
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
12 | GNU Lesser General Public License for more details. | ||
13 | |||
14 | You should have received a copy of the GNU Lesser General Public License | ||
15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ | ||
16 | |||
17 | /* Written by Bruno Haible <bruno@clisp.org>, 2005. | ||
18 | Based on GCC's gthr-win32.h. */ | ||
19 | |||
20 | #include <config.h> | ||
21 | |||
22 | /* Specification. */ | ||
23 | #include "windows-once.h" | ||
24 | |||
25 | #include <stdlib.h> | ||
26 | |||
27 | void | ||
28 | glwthread_once (glwthread_once_t *once_control, void (*initfunction) (void)) | ||
29 | { | ||
30 | if (once_control->inited <= 0) | ||
31 | { | ||
32 | if (InterlockedIncrement (&once_control->started) == 0) | ||
33 | { | ||
34 | /* This thread is the first one to come to this once_control. */ | ||
35 | InitializeCriticalSection (&once_control->lock); | ||
36 | EnterCriticalSection (&once_control->lock); | ||
37 | once_control->inited = 0; | ||
38 | initfunction (); | ||
39 | once_control->inited = 1; | ||
40 | LeaveCriticalSection (&once_control->lock); | ||
41 | } | ||
42 | else | ||
43 | { | ||
44 | /* Don't let once_control->started grow and wrap around. */ | ||
45 | InterlockedDecrement (&once_control->started); | ||
46 | /* Some other thread has already started the initialization. | ||
47 | Yield the CPU while waiting for the other thread to finish | ||
48 | initializing and taking the lock. */ | ||
49 | while (once_control->inited < 0) | ||
50 | Sleep (0); | ||
51 | if (once_control->inited <= 0) | ||
52 | { | ||
53 | /* Take the lock. This blocks until the other thread has | ||
54 | finished calling the initfunction. */ | ||
55 | EnterCriticalSection (&once_control->lock); | ||
56 | LeaveCriticalSection (&once_control->lock); | ||
57 | if (!(once_control->inited > 0)) | ||
58 | abort (); | ||
59 | } | ||
60 | } | ||
61 | } | ||
62 | } | ||