Function SDL_TimerThread

Source/3rdParty/SDL2/src/timer/SDL_timer.c:102–205

}

static int SDLCALL SDL_TimerThread(void *_data)
{
    SDL_TimerData *data = (SDL_TimerData *)_data;
    SDL_Timer *pending;
    SDL_Timer *current;
    SDL_Timer *freelist_head = NULL;
    SDL_Timer *freelist_tail = NULL;
    Uint32 tick, now, interval, delay;

    /* Threaded timer loop:
     *  1. Queue timers added by other threads
     *  2. Handle any timers that should dispatch this cycle
     *  3. Wait until next dispatch time or new timer arrives
     */
    for (;;) {
        /* Pending and freelist maintenance */
        SDL_AtomicLock(&data->lock);
        {
            /* Get any timers ready to be queued */
            pending = data->pending;
            data->pending = NULL;

            /* Make any unused timer structures available */
            if (freelist_head) {
                freelist_tail->next = data->freelist;
                data->freelist = freelist_head;
            }
        }
        SDL_AtomicUnlock(&data->lock);

        /* Sort the pending timers into our list */
        while (pending) {
            current = pending;
            pending = pending->next;
            SDL_AddTimerInternal(data, current);
        }
        freelist_head = NULL;
        freelist_tail = NULL;

        /* Check to see if we're still running, after maintenance */
        if (!SDL_AtomicGet(&data->active)) {
            break;
        }

        /* Initial delay if there are no timers */
        delay = SDL_MUTEX_MAXWAIT;

        tick = SDL_GetTicks();

        /* Process all the pending timers for this tick */
        while (data->timers) {
            current = data->timers;

            if ((Sint32)(tick - current->scheduled) < 0) {
                /* Scheduled for the future, wait a bit */
                delay = (current->scheduled - tick);
                break;
            }