Function run_timer_process

timer.c:521–617

static void run_timer_process( void )
{
	unsigned int multiple;
	unsigned int cnt;
	struct timeval o_tv;
	struct timeval tv, comp_tv;
	utime_t  drift;
	utime_t  uinterval;
	utime_t  wait;
	utime_t  ij;

/* timer re-calibration to compensate drifting */
#define compute_wait_with_drift(_tv) \
	do {                                                         \
		if ( drift > ITIMER_TICK ) {                             \
			wait = (drift >= uinterval) ? 0 : uinterval-drift;   \
			_tv.tv_sec = wait / 1000000;                         \
			_tv.tv_usec = wait % 1000000;                        \
			drift -= uinterval-wait;                             \
		} else {                                                 \
			_tv = o_tv;                                          \
		}                                                        \
	}while(0)


	if ( (utimer_list==NULL) || ((TIMER_TICK*1000000) == UTIMER_TICK) ) {
		o_tv.tv_sec = TIMER_TICK;
		o_tv.tv_usec = 0;
		multiple = 1;
	} else {
		o_tv.tv_sec = UTIMER_TICK / 1000000;
		o_tv.tv_usec = UTIMER_TICK % 1000000;
		multiple = (( TIMER_TICK * 1000000 ) / UTIMER_TICK ) / 1000000;
	}

	LM_DBG("    tv = %ld, %ld, m=%d\n",
		(long)o_tv.tv_sec,(long)o_tv.tv_usec,multiple);

	drift = 0;
	uinterval = o_tv.tv_sec * 1000000 + o_tv.tv_usec;

	if (utimer_list==NULL) {
		/* only TIMERs, ticking at TIMER_TICK */
		for( ; ; ) {
			ij = *ijiffies;
			compute_wait_with_drift(comp_tv);
			tv = comp_tv;
			select( 0, 0, 0, 0, &tv);

			timer_ticker( timer_list);
			lock_get(tr_list_lock);
			timer_ticker( *tr_timer_list);
			lock_release(tr_list_lock);

			drift += ((utime_t)comp_tv.tv_sec*1000000+comp_tv.tv_usec > (*ijiffies-ij)) ?
					0 : *ijiffies-ij - ((utime_t)comp_tv.tv_sec*1000000+comp_tv.tv_usec);
		}