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24c86b5501
since the window system doesn't do it for us like other platforms. This prevents sticky keys and missed keys when going in and out of focus, for example Alt would appear to stick if switching away from an SDL app with Alt-Tab and had to be pressed again. CR: Sam
149 lines
3.7 KiB
C
149 lines
3.7 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2014 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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#include <sys/time.h>
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#include <unistd.h>
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#include <errno.h>
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#include <pthread.h>
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#include "SDL_thread.h"
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#include "SDL_sysmutex_c.h"
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struct SDL_cond
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{
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pthread_cond_t cond;
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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;
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cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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if (cond) {
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if (pthread_cond_init(&cond->cond, NULL) < 0) {
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SDL_SetError("pthread_cond_init() failed");
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SDL_free(cond);
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cond = NULL;
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}
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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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pthread_cond_destroy(&cond->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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int retval;
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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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retval = 0;
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if (pthread_cond_signal(&cond->cond) != 0) {
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return SDL_SetError("pthread_cond_signal() failed");
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}
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return retval;
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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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int retval;
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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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retval = 0;
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if (pthread_cond_broadcast(&cond->cond) != 0) {
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return SDL_SetError("pthread_cond_broadcast() failed");
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}
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return retval;
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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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int retval;
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struct timeval delta;
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struct timespec abstime;
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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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gettimeofday(&delta, NULL);
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abstime.tv_sec = delta.tv_sec + (ms / 1000);
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abstime.tv_nsec = (delta.tv_usec + (ms % 1000) * 1000) * 1000;
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if (abstime.tv_nsec > 1000000000) {
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abstime.tv_sec += 1;
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abstime.tv_nsec -= 1000000000;
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}
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tryagain:
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retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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switch (retval) {
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case EINTR:
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goto tryagain;
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break;
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case ETIMEDOUT:
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retval = SDL_MUTEX_TIMEDOUT;
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break;
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case 0:
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break;
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default:
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retval = SDL_SetError("pthread_cond_timedwait() failed");
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}
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return retval;
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}
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/* Wait on the condition variable, unlocking the provided mutex.
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The mutex must be locked before entering this function!
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*/
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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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if (!cond) {
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return SDL_SetError("Passed a NULL condition variable");
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} else if (pthread_cond_wait(&cond->cond, &mutex->id) != 0) {
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return SDL_SetError("pthread_cond_wait() failed");
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}
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return 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */
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