cpuload.c

用于计算当前的CPU负载

#include <vxworks.h>
#include <limits.h>
#include <stdio.h>
#include <ticklib.h>
#include <tasklib.h>

#define	TEST_SCALE	1000
static unsigned long cpuCompareValue;
unsigned long cpuLoadTicks;

static void cpuLoadTask()
{
	unsigned long value, count, tickstart, i;
	
	i=0;
	while(1) {

		// Disable cpu load test
		if (cpuCompareValue == 0){
			taskDelay(sysClkRateGet());
			continue;
		}

		count = 0;
		tickstart = tickGet();
		while(cpuLoadTicks > (tickGet() - tickstart)){
			count++;
			taskDelay(0);
		}

		count /= TEST_SCALE;
		if(cpuCompareValue < 2)	value = count;
		else	
			value = ((cpuCompareValue - count) * 100 ) / cpuCompareValue;
		
		if((i++ % 10) == 0)
			printf("\nCPU Load: %d ", value);
		else
			printf("%d ", value);
	}
}

//
// Input test cycle value, unit is 0.5s
//
void cpuLoadInit()
{
	cpuCompareValue = 0;	// Disable Show & no compare value
	cpuLoadTicks = sysClkRateGet();	// Default 500ms test period

	taskSpawn("cpuLoadTask", 255, VX_FP_TASK, 1000, (FUNCPTR)cpuLoadTask, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
}

//
// 0/1 dis/enable load value show
// more than 1000, regards it as compare value
//
void cpuLoadSet(int value)
{
	cpuCompareValue = value;
}