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author | RincewindsHat <12514511+RincewindsHat@users.noreply.github.com> | 2021-11-17 01:05:54 +0100 |
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committer | RincewindsHat <12514511+RincewindsHat@users.noreply.github.com> | 2022-07-24 19:35:11 +0200 |
commit | a405fc138596f552581d2011fd6de02d5c8186c4 (patch) | |
tree | 4c084700b5cb5e9fcedf982a2d921bbc41d9935a /gl/windows-rwlock.h | |
parent | 9f2a9ca3d72023ff9b5707d1872c54d65edc9017 (diff) | |
download | monitoring-plugins-a405fc138596f552581d2011fd6de02d5c8186c4.tar.gz |
Sync with the latest Gnulib code (1a268176f)
Diffstat (limited to 'gl/windows-rwlock.h')
-rw-r--r-- | gl/windows-rwlock.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/gl/windows-rwlock.h b/gl/windows-rwlock.h new file mode 100644 index 00000000..280c9f2a --- /dev/null +++ b/gl/windows-rwlock.h | |||
@@ -0,0 +1,68 @@ | |||
1 | /* Read-write locks (native Windows implementation). | ||
2 | Copyright (C) 2005-2021 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 | #ifndef _WINDOWS_RWLOCK_H | ||
21 | #define _WINDOWS_RWLOCK_H | ||
22 | |||
23 | #define WIN32_LEAN_AND_MEAN /* avoid including junk */ | ||
24 | #include <windows.h> | ||
25 | |||
26 | #include "windows-initguard.h" | ||
27 | |||
28 | /* It is impossible to implement read-write locks using plain locks, without | ||
29 | introducing an extra thread dedicated to managing read-write locks. | ||
30 | Therefore here we need to use the low-level Event type. */ | ||
31 | |||
32 | typedef struct | ||
33 | { | ||
34 | HANDLE *array; /* array of waiting threads, each represented by an event */ | ||
35 | unsigned int count; /* number of waiting threads */ | ||
36 | unsigned int alloc; /* length of allocated array */ | ||
37 | unsigned int offset; /* index of first waiting thread in array */ | ||
38 | } | ||
39 | glwthread_carray_waitqueue_t; | ||
40 | typedef struct | ||
41 | { | ||
42 | glwthread_initguard_t guard; /* protects the initialization */ | ||
43 | CRITICAL_SECTION lock; /* protects the remaining fields */ | ||
44 | glwthread_carray_waitqueue_t waiting_readers; /* waiting readers */ | ||
45 | glwthread_carray_waitqueue_t waiting_writers; /* waiting writers */ | ||
46 | int runcount; /* number of readers running, or -1 when a writer runs */ | ||
47 | } | ||
48 | glwthread_rwlock_t; | ||
49 | |||
50 | #define GLWTHREAD_RWLOCK_INIT { GLWTHREAD_INITGUARD_INIT } | ||
51 | |||
52 | #ifdef __cplusplus | ||
53 | extern "C" { | ||
54 | #endif | ||
55 | |||
56 | extern void glwthread_rwlock_init (glwthread_rwlock_t *lock); | ||
57 | extern int glwthread_rwlock_rdlock (glwthread_rwlock_t *lock); | ||
58 | extern int glwthread_rwlock_wrlock (glwthread_rwlock_t *lock); | ||
59 | extern int glwthread_rwlock_tryrdlock (glwthread_rwlock_t *lock); | ||
60 | extern int glwthread_rwlock_trywrlock (glwthread_rwlock_t *lock); | ||
61 | extern int glwthread_rwlock_unlock (glwthread_rwlock_t *lock); | ||
62 | extern int glwthread_rwlock_destroy (glwthread_rwlock_t *lock); | ||
63 | |||
64 | #ifdef __cplusplus | ||
65 | } | ||
66 | #endif | ||
67 | |||
68 | #endif /* _WINDOWS_RWLOCK_H */ | ||