void alarmRemove(Alarm_t *alarm)
{
Handle_t h;
ATOMIC_START(h);
SLIST_REMOVE_SAFE(&alarmListHead, alarm, Alarm_s, chain);
ATOMIC_END(h);
}
void alarmSchedule(Alarm_t *alarm, uint32_t milliseconds)
{
// we want to avoid inserting local variables in the global alarm list
// (but this warning, not an error, because the user function may never return)
WARN_ON(isStackAddress(alarm));
// PRINTF("alarmSchedule %p, ms=%lu\n", alarm, milliseconds);
alarm->jiffies = (uint32_t)getJiffies() + milliseconds;
// locking is required, because both kernel and user threads can be using this function
Handle_t h;
ATOMIC_START(h);
// unschedule the alarm, if it was already scheduled
SLIST_REMOVE_SAFE(&alarmListHead, alarm, Alarm_s, chain);
// insert it in appropriate position
Alarm_t **prev = &SLIST_FIRST(&alarmListHead);
Alarm_t *a = *prev;
while (a && timeAfter32(alarm->jiffies, a->jiffies)) {
prev = &SLIST_NEXT(a, chain);
a = *prev;
}
SLIST_INSERT(prev, alarm, chain);
#if USE_THREADS
// always reschedule alarm processing in case some alarm was added
// that might need to be processed before end of current kernel sleep time
processFlags.bits.alarmsProcess = true;
// and make sure the kernel thread is awake and ready to deal with it
threadWakeup(KERNEL_THREAD_INDEX, THREAD_READY);
#endif
ATOMIC_END(h);
}
