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https://github.com/Relintai/sdl2_frt.git
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111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if SDL_THREAD_WINDOWS
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/* Mutex functions using the Win32 API */
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#include "../../core/windows/SDL_windows.h"
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#include "SDL_mutex.h"
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struct SDL_mutex
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{
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CRITICAL_SECTION cs;
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};
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/* Create a mutex */
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SDL_mutex *
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SDL_CreateMutex(void)
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{
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SDL_mutex *mutex;
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/* Allocate mutex memory */
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mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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if (mutex) {
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/* Initialize */
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/* On SMP systems, a non-zero spin count generally helps performance */
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#if __WINRT__
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InitializeCriticalSectionEx(&mutex->cs, 2000, 0);
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#else
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InitializeCriticalSectionAndSpinCount(&mutex->cs, 2000);
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#endif
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} else {
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SDL_OutOfMemory();
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}
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return (mutex);
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}
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/* Free the mutex */
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void
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SDL_DestroyMutex(SDL_mutex * mutex)
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{
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if (mutex) {
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DeleteCriticalSection(&mutex->cs);
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SDL_free(mutex);
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}
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}
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/* Lock the mutex */
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int
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SDL_LockMutex(SDL_mutex * mutex)
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{
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if (mutex == NULL) {
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return SDL_SetError("Passed a NULL mutex");
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}
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EnterCriticalSection(&mutex->cs);
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return (0);
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}
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/* TryLock the mutex */
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int
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SDL_TryLockMutex(SDL_mutex * mutex)
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{
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int retval = 0;
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if (mutex == NULL) {
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return SDL_SetError("Passed a NULL mutex");
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}
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if (TryEnterCriticalSection(&mutex->cs) == 0) {
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retval = SDL_MUTEX_TIMEDOUT;
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}
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return retval;
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}
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/* Unlock the mutex */
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int
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SDL_UnlockMutex(SDL_mutex * mutex)
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{
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if (mutex == NULL) {
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return SDL_SetError("Passed a NULL mutex");
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}
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LeaveCriticalSection(&mutex->cs);
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return (0);
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}
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#endif /* SDL_THREAD_WINDOWS */
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/* vi: set ts=4 sw=4 expandtab: */
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