zenilib: zenilib/jni/external/sdl/src/thread/windows/SDL_sysmutex.c Source File

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SDL_sysmutex.c
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1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "SDL_config.h"
22
23 #if SDL_THREAD_WINDOWS
24
25 /* Mutex functions using the Win32 API */
26
27 #include "../../core/windows/SDL_windows.h"
28
29 #include "SDL_mutex.h"
30
31
32 struct SDL_mutex
33 {
34 CRITICAL_SECTION cs;
35 };
36
37 /* Create a mutex */
38 SDL_mutex *
39 SDL_CreateMutex(void)
40 {
41 SDL_mutex *mutex;
42
43 /* Allocate mutex memory */
44 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
45 if (mutex) {
46 /* Initialize */
47 /* On SMP systems, a non-zero spin count generally helps performance */
48 InitializeCriticalSectionAndSpinCount(&mutex->cs, 2000);
49 } else {
50 SDL_OutOfMemory();
51 }
52 return (mutex);
53 }
54
55 /* Free the mutex */
56 void
57 SDL_DestroyMutex(SDL_mutex * mutex)
58 {
59 if (mutex) {
60 DeleteCriticalSection(&mutex->cs);
61 SDL_free(mutex);
62 }
63 }
64
65 /* Lock the mutex */
66 int
67 SDL_LockMutex(SDL_mutex * mutex)
68 {
69 if (mutex == NULL) {
70 return SDL_SetError("Passed a NULL mutex");
71 }
72
73 EnterCriticalSection(&mutex->cs);
74 return (0);
75 }
76
77 /* TryLock the mutex */
78 int
79 SDL_TryLockMutex(SDL_mutex * mutex)
80 {
81 int retval = 0;
82 if (mutex == NULL) {
83 return SDL_SetError("Passed a NULL mutex");
84 }
85
86 if (TryEnterCriticalSection(&mutex->cs) == 0) {
87 retval = SDL_MUTEX_TIMEDOUT;
88 }
89 return retval;
90 }
91
92 /* Unlock the mutex */
93 int
94 SDL_UnlockMutex(SDL_mutex * mutex)
95 {
96 if (mutex == NULL) {
97 return SDL_SetError("Passed a NULL mutex");
98 }
99
100 LeaveCriticalSection(&mutex->cs);
101 return (0);
102 }
103
104 #endif /* SDL_THREAD_WINDOWS */
105
106 /* vi: set ts=4 sw=4 expandtab: */
NULL
#define NULL
Definition: ftobjs.h:61
SDL_LockMutex
DECLSPEC int SDLCALL SDL_LockMutex(SDL_mutex *mutex)
Definition: SDL_sysmutex.c:73
SDL_CreateMutex
DECLSPEC SDL_mutex *SDLCALL SDL_CreateMutex(void)
Definition: SDL_sysmutex.c:38
SDL_free
DECLSPEC void SDLCALL SDL_free(void *mem)
SDL_config.h
SDL_UnlockMutex
DECLSPEC int SDLCALL SDL_UnlockMutex(SDL_mutex *mutex)
Definition: SDL_sysmutex.c:160
SDL_TryLockMutex
DECLSPEC int SDLCALL SDL_TryLockMutex(SDL_mutex *mutex)
Definition: SDL_sysmutex.c:103
SDL_SetError
DECLSPEC int SDLCALL SDL_SetError(const char *fmt,...)
Definition: SDL_error.c:53
SDL_malloc
DECLSPEC void *SDLCALL SDL_malloc(size_t size)
CRITICAL_SECTION
pthread_mutex_t CRITICAL_SECTION
Definition: alMain.h:101
SDL_OutOfMemory
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
EnterCriticalSection
void EnterCriticalSection(CRITICAL_SECTION *cs)
Definition: helpers.c:359
SDL_mutex
struct SDL_mutex SDL_mutex
Definition: SDL_mutex.h:59
DeleteCriticalSection
void DeleteCriticalSection(CRITICAL_SECTION *cs)
Definition: helpers.c:353
SDL_DestroyMutex
DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex)
Definition: SDL_sysmutex.c:61
SDL_MUTEX_TIMEDOUT
#define SDL_MUTEX_TIMEDOUT
Definition: SDL_mutex.h:44
LeaveCriticalSection
void LeaveCriticalSection(CRITICAL_SECTION *cs)
Definition: helpers.c:365