SDL_timer_c.h File Reference

#include "../SDL_internal.h"
#include "SDL_timer.h"

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Macros
#define	ROUND_RESOLUTION(X)   (((X+TIMER_RESOLUTION-1)/TIMER_RESOLUTION)*TIMER_RESOLUTION)

Functions
void	SDL_TicksInit (void)
void	SDL_TicksQuit (void)
int	SDL_TimerInit (void)
void	SDL_TimerQuit (void)

Macro Definition Documentation

#define ROUND_RESOLUTION

(

X

)

(((X+TIMER_RESOLUTION-1)/TIMER_RESOLUTION)*TIMER_RESOLUTION)

Definition at line 30 of file SDL_timer_c.h.

Function Documentation

void SDL_TicksInit

(

void

)

Referenced by SDL_InitSubSystem(), and SDL_VideoInit().

void SDL_TicksQuit

(

void

)

Referenced by SDL_Quit().

int SDL_TimerInit

(

void

)

Definition at line 207 of file SDL_timer.c.

References SDL_TimerData::active, SDL_TimerData::nextID, SDL_AtomicGet, SDL_AtomicSet, SDL_CreateMutex, SDL_CreateSemaphore, SDL_CreateThreadInternal(), SDL_DestroyMutex, SDL_timer_data, SDL_TimerQuit(), SDL_TimerThread(), SDL_TimerData::sem, SDL_TimerData::thread, and SDL_TimerData::timermap_lock.

Referenced by SDL_AddTimer(), and SDL_InitSubSystem().

{
    SDL_TimerData *data = &SDL_timer_data;

    if (!SDL_AtomicGet(&data->active)) {
        const char *name = "SDLTimer";
        data->timermap_lock = SDL_CreateMutex();
        if (!data->timermap_lock) {
            return -1;
        }

        data->sem = SDL_CreateSemaphore(0);
        if (!data->sem) {
            SDL_DestroyMutex(data->timermap_lock);
            return -1;
        }

        SDL_AtomicSet(&data->active, 1);

        /* Timer threads use a callback into the app, so we can't set a limited stack size here. */
        data->thread = SDL_CreateThreadInternal(SDL_TimerThread, name, 0, data);
        if (!data->thread) {
            SDL_TimerQuit();
            return -1;
        }

        SDL_AtomicSet(&data->nextID, 1);
    }
    return 0;
}

void SDL_TimerQuit

(

void

)

Definition at line 239 of file SDL_timer.c.

References SDL_TimerData::active, SDL_TimerData::freelist, SDL_Timer::next, SDL_TimerMap::next, NULL, SDL_AtomicCAS, SDL_DestroyMutex, SDL_DestroySemaphore, SDL_free, SDL_SemPost, SDL_timer_data, SDL_WaitThread, SDL_TimerData::sem, SDL_TimerData::thread, SDL_TimerData::timermap, SDL_TimerData::timermap_lock, and SDL_TimerData::timers.

Referenced by SDL_QuitSubSystem(), and SDL_TimerInit().

{
    SDL_TimerData *data = &SDL_timer_data;
    SDL_Timer *timer;
    SDL_TimerMap *entry;

    if (SDL_AtomicCAS(&data->active, 1, 0)) {  /* active? Move to inactive. */
        /* Shutdown the timer thread */
        if (data->thread) {
            SDL_SemPost(data->sem);
            SDL_WaitThread(data->thread, NULL);
            data->thread = NULL;
        }

        SDL_DestroySemaphore(data->sem);
        data->sem = NULL;

        /* Clean up the timer entries */
        while (data->timers) {
            timer = data->timers;
            data->timers = timer->next;
            SDL_free(timer);
        }
        while (data->freelist) {
            timer = data->freelist;
            data->freelist = timer->next;
            SDL_free(timer);
        }
        while (data->timermap) {
            entry = data->timermap;
            data->timermap = entry->next;
            SDL_free(entry);
        }

        SDL_DestroyMutex(data->timermap_lock);
        data->timermap_lock = NULL;
    }
}