Atlas - SDL_sysmutex.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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_internal.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
32struct SDL_mutex
33{
34    CRITICAL_SECTION cs;
35};
36
37/* Create a mutex */
38SDL_mutex *
39SDL_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#if __WINRT__
49        InitializeCriticalSectionEx(&mutex->cs, 2000, 0);
50#else
51        InitializeCriticalSectionAndSpinCount(&mutex->cs, 2000);
52#endif
53    } else {
54        SDL_OutOfMemory();
55    }
56    return (mutex);
57}
58
59/* Free the mutex */
60void
61SDL_DestroyMutex(SDL_mutex * mutex)
62{
63    if (mutex) {
64        DeleteCriticalSection(&mutex->cs);
65        SDL_free(mutex);
66    }
67}
68
69/* Lock the mutex */
70int
71SDL_LockMutex(SDL_mutex * mutex)
72{
73    if (mutex == NULL) {
74        return SDL_SetError("Passed a NULL mutex");
75    }
76
77    EnterCriticalSection(&mutex->cs);
78    return (0);
79}
80
81/* TryLock the mutex */
82int
83SDL_TryLockMutex(SDL_mutex * mutex)
84{
85    int retval = 0;
86    if (mutex == NULL) {
87        return SDL_SetError("Passed a NULL mutex");
88    }
89
90    if (TryEnterCriticalSection(&mutex->cs) == 0) {
91        retval = SDL_MUTEX_TIMEDOUT;
92    }
93    return retval;
94}
95
96/* Unlock the mutex */
97int
98SDL_UnlockMutex(SDL_mutex * mutex)
99{
100    if (mutex == NULL) {
101        return SDL_SetError("Passed a NULL mutex");
102    }
103
104    LeaveCriticalSection(&mutex->cs);
105    return (0);
106}
107
108#endif /* SDL_THREAD_WINDOWS */
109
110/* vi: set ts=4 sw=4 expandtab: */
111
[FILE END]
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