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author | RincewindsHat <12514511+RincewindsHat@users.noreply.github.com> | 2023-01-31 14:46:01 +0100 |
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committer | RincewindsHat <12514511+RincewindsHat@users.noreply.github.com> | 2023-01-31 14:46:01 +0100 |
commit | e8bd88d1fcded01ccd066572eeaae1b507989cb3 (patch) | |
tree | c8e7be6c07c6f635f6e803e6a6ba9e7a95fee7c0 /gl/windows-recmutex.c | |
parent | 2ad962c13473607ca0d974bfaa516a0ed53ec73d (diff) | |
download | monitoring-plugins-e8bd88d1fcded01ccd066572eeaae1b507989cb3.tar.gz |
Sync with the latest Gnulib code 668c0b8ffa
Diffstat (limited to 'gl/windows-recmutex.c')
-rw-r--r-- | gl/windows-recmutex.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/gl/windows-recmutex.c b/gl/windows-recmutex.c new file mode 100644 index 00000000..a8ce9a04 --- /dev/null +++ b/gl/windows-recmutex.c | |||
@@ -0,0 +1,127 @@ | |||
1 | /* Plain recursive mutexes (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-recmutex.h" | ||
24 | |||
25 | #include <errno.h> | ||
26 | |||
27 | void | ||
28 | glwthread_recmutex_init (glwthread_recmutex_t *mutex) | ||
29 | { | ||
30 | mutex->owner = 0; | ||
31 | mutex->depth = 0; | ||
32 | InitializeCriticalSection (&mutex->lock); | ||
33 | mutex->guard.done = 1; | ||
34 | } | ||
35 | |||
36 | int | ||
37 | glwthread_recmutex_lock (glwthread_recmutex_t *mutex) | ||
38 | { | ||
39 | if (!mutex->guard.done) | ||
40 | { | ||
41 | if (InterlockedIncrement (&mutex->guard.started) == 0) | ||
42 | /* This thread is the first one to need this mutex. Initialize it. */ | ||
43 | glwthread_recmutex_init (mutex); | ||
44 | else | ||
45 | { | ||
46 | /* Don't let mutex->guard.started grow and wrap around. */ | ||
47 | InterlockedDecrement (&mutex->guard.started); | ||
48 | /* Yield the CPU while waiting for another thread to finish | ||
49 | initializing this mutex. */ | ||
50 | while (!mutex->guard.done) | ||
51 | Sleep (0); | ||
52 | } | ||
53 | } | ||
54 | { | ||
55 | DWORD self = GetCurrentThreadId (); | ||
56 | if (mutex->owner != self) | ||
57 | { | ||
58 | EnterCriticalSection (&mutex->lock); | ||
59 | mutex->owner = self; | ||
60 | } | ||
61 | if (++(mutex->depth) == 0) /* wraparound? */ | ||
62 | { | ||
63 | mutex->depth--; | ||
64 | return EAGAIN; | ||
65 | } | ||
66 | } | ||
67 | return 0; | ||
68 | } | ||
69 | |||
70 | int | ||
71 | glwthread_recmutex_trylock (glwthread_recmutex_t *mutex) | ||
72 | { | ||
73 | if (!mutex->guard.done) | ||
74 | { | ||
75 | if (InterlockedIncrement (&mutex->guard.started) == 0) | ||
76 | /* This thread is the first one to need this mutex. Initialize it. */ | ||
77 | glwthread_recmutex_init (mutex); | ||
78 | else | ||
79 | { | ||
80 | /* Don't let mutex->guard.started grow and wrap around. */ | ||
81 | InterlockedDecrement (&mutex->guard.started); | ||
82 | /* Let another thread finish initializing this mutex, and let it also | ||
83 | lock this mutex. */ | ||
84 | return EBUSY; | ||
85 | } | ||
86 | } | ||
87 | { | ||
88 | DWORD self = GetCurrentThreadId (); | ||
89 | if (mutex->owner != self) | ||
90 | { | ||
91 | if (!TryEnterCriticalSection (&mutex->lock)) | ||
92 | return EBUSY; | ||
93 | mutex->owner = self; | ||
94 | } | ||
95 | if (++(mutex->depth) == 0) /* wraparound? */ | ||
96 | { | ||
97 | mutex->depth--; | ||
98 | return EAGAIN; | ||
99 | } | ||
100 | } | ||
101 | return 0; | ||
102 | } | ||
103 | |||
104 | int | ||
105 | glwthread_recmutex_unlock (glwthread_recmutex_t *mutex) | ||
106 | { | ||
107 | if (mutex->owner != GetCurrentThreadId ()) | ||
108 | return EPERM; | ||
109 | if (mutex->depth == 0) | ||
110 | return EINVAL; | ||
111 | if (--(mutex->depth) == 0) | ||
112 | { | ||
113 | mutex->owner = 0; | ||
114 | LeaveCriticalSection (&mutex->lock); | ||
115 | } | ||
116 | return 0; | ||
117 | } | ||
118 | |||
119 | int | ||
120 | glwthread_recmutex_destroy (glwthread_recmutex_t *mutex) | ||
121 | { | ||
122 | if (mutex->owner != 0) | ||
123 | return EBUSY; | ||
124 | DeleteCriticalSection (&mutex->lock); | ||
125 | mutex->guard.done = 0; | ||
126 | return 0; | ||
127 | } | ||