C++ (Cpp) apm_do_busy Examples

Example #1

File: process.c Project: andreiw/mkunity

static void hard_idle(void)
{
	while (!need_resched) {
		if (hlt_works_ok && !hlt_counter) {
#ifdef CONFIG_APM
				/* If the APM BIOS is not enabled, or there
				 is an error calling the idle routine, we
				 should hlt if possible.  We need to check
				 need_resched again because an interrupt
				 may have occurred in apm_do_idle(). */
			start_bh_atomic();
			if (!apm_do_idle() && !need_resched)
				__asm__("hlt");
			end_bh_atomic();
#else
			__asm__("hlt");
#endif
	        }
 		if (need_resched) 
 			break;
		schedule();
	}
#ifdef CONFIG_APM
	apm_do_busy();
#endif
}

Example #2

static void apm_cpu_idle(void)
{
	static int use_apm_idle; /* = 0 */
	static unsigned int last_jiffies; /* = 0 */
	static unsigned int last_stime; /* = 0 */

	int apm_idle_done = 0;
	unsigned int jiffies_since_last_check = jiffies - last_jiffies;
	unsigned int bucket;

recalc:
	if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
		use_apm_idle = 0;
		last_jiffies = jiffies;
		last_stime = current->stime;
	} else if (jiffies_since_last_check > idle_period) {
		unsigned int idle_percentage;

		idle_percentage = current->stime - last_stime;
		idle_percentage *= 100;
		idle_percentage /= jiffies_since_last_check;
		use_apm_idle = (idle_percentage > idle_threshold);
		if (apm_info.forbid_idle)
			use_apm_idle = 0;
		last_jiffies = jiffies;
		last_stime = current->stime;
	}

	bucket = IDLE_LEAKY_MAX;

	while (!need_resched()) {
		if (use_apm_idle) {
			unsigned int t;

			t = jiffies;
			switch (apm_do_idle()) {
			case 0:
				apm_idle_done = 1;
				if (t != jiffies) {
					if (bucket) {
						bucket = IDLE_LEAKY_MAX;
						continue;
					}
				} else if (bucket) {
					bucket--;
					continue;
				}
				break;
			case 1:
				apm_idle_done = 1;
				break;
			default: /* BIOS refused */
				break;
			}
		}
		if (original_pm_idle)
			original_pm_idle();
		else
			default_idle();
		local_irq_disable();
		jiffies_since_last_check = jiffies - last_jiffies;
		if (jiffies_since_last_check > idle_period)
			goto recalc;
	}

	if (apm_idle_done)
		apm_do_busy();

	local_irq_enable();
}