mirror of https://github.com/encounter/SDL.git
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 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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#ifdef SDL_THREAD_N3DS
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/* An implementation of condition variables using libctru's CondVar */
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#include "SDL_sysmutex_c.h"
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struct SDL_cond
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{
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CondVar cond_variable;
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};
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/* Create a condition variable */
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SDL_cond *
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SDL_CreateCond(void)
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{
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SDL_cond *cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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if (cond) {
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CondVar_Init(&cond->cond_variable);
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} else {
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SDL_OutOfMemory();
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}
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return cond;
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}
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/* Destroy a condition variable */
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void
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SDL_DestroyCond(SDL_cond *cond)
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{
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if (cond) {
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SDL_free(cond);
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}
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}
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/* Restart one of the threads that are waiting on the condition variable */
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int
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SDL_CondSignal(SDL_cond *cond)
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{
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if (!cond) {
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return SDL_SetError("Passed a NULL condition variable");
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}
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CondVar_Signal(&cond->cond_variable);
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return 0;
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}
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/* Restart all threads that are waiting on the condition variable */
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int
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SDL_CondBroadcast(SDL_cond *cond)
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{
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if (!cond) {
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return SDL_SetError("Passed a NULL condition variable");
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}
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CondVar_Broadcast(&cond->cond_variable);
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return 0;
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}
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/* Wait on the condition variable for at most 'ms' milliseconds.
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The mutex must be locked before entering this function!
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The mutex is unlocked during the wait, and locked again after the wait.
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Typical use:
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Thread A:
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SDL_LockMutex(lock);
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while ( ! condition ) {
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SDL_CondWait(cond, lock);
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}
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SDL_UnlockMutex(lock);
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Thread B:
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SDL_LockMutex(lock);
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...
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condition = true;
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...
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SDL_CondSignal(cond);
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SDL_UnlockMutex(lock);
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*/
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int
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SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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{
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Result res;
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if (!cond) {
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return SDL_SetError("Passed a NULL condition variable");
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}
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if (!mutex) {
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return SDL_SetError("Passed a NULL mutex");
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}
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res = 0;
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if (ms == SDL_MUTEX_MAXWAIT) {
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CondVar_Wait(&cond->cond_variable, &mutex->lock.lock);
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} else {
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res = CondVar_WaitTimeout(&cond->cond_variable, &mutex->lock.lock,
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(s64) ms * 1000000LL);
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}
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return R_SUCCEEDED(res) ? 0 : SDL_MUTEX_TIMEDOUT;
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}
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/* Wait on the condition variable forever */
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int
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SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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{
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return SDL_CondWaitTimeout(cond, mutex, SDL_MUTEX_MAXWAIT);
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}
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#endif /* SDL_THREAD_N3DS */
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/* vi: set sts=4 ts=4 sw=4 expandtab: */
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