osjob_t  , 代表 job ,及儲存內容

排程函式 os_runloop_once()

void os_runloop_once() {

    osjob_t* j = NULL;

    hal_processPendingIRQs();  // 處理待處理的 IRQ

    hal_disableIRQs();   // 禁止 IRQ

    // check for runnable jobs

    if(OS.runnablejobs) {

        j = OS.runnablejobs;

        OS.runnablejobs = j->next;

    } else if(OS.scheduledjobs && hal_checkTimer(OS.scheduledjobs->deadline)) { // check for expired timed jobs

        j = OS.scheduledjobs;

        OS.scheduledjobs = j->next;

    } else { // nothing pending

        hal_sleep(); // wake by irq (timer already restarted)

    }

    hal_enableIRQs();

    if(j) { // run job callback

        j->func(j);

    }

}