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add CPU usage example code. 

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1282 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
bernard.xiong@gmail.com 2011-02-20 15:15:04 +00:00
parent 664a1345cf
commit ceda7d874e
1 changed files with 71 additions and 0 deletions
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71
examples/kernel/cpuusage.c Normal file
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#include <rtthread.h>
#include <rthw.h>
#define CPU_USAGE_CALC_TICK 10
#define CPU_USAGE_LOOP 100
static rt_uint8_t cpu_usage_major = 0, cpu_usage_minor= 0;
static rt_uint32_t total_count = 0;
static void cpu_usage_idle_hook()
{
rt_tick_t tick;
rt_uint32_t count;
volatile rt_uint32_t loop;
if (total_count == 0)
{
loop = 0;
/* get total count */
rt_enter_critical();
tick = rt_tick_get();
while(rt_tick_get() - tick < CPU_USAGE_CALC_TICK)
{
total_count ++;
while (loop < CPU_USAGE_LOOP) loop ++;
}
rt_exit_critical();
}
count = 0;
loop = 0;
/* get CPU usage */
tick = rt_tick_get();
while (rt_tick_get() - tick < CPU_USAGE_CALC_TICK)
{
count ++;
while (loop < CPU_USAGE_LOOP) loop ++;
}
/* calculate major and minor */
if (count < total_count)
{
count = total_count - count;
cpu_usage_major = (count * 100) / total_count;
cpu_usage_minor = ((count * 100) % total_count) * 100 / total_count;
}
else
{
total_count = count;
/* no CPU usage */
cpu_usage_major = 0;
cpu_usage_minor = 0;
}
}
void cpu_usage_get(rt_uint8_t *major, rt_uint8_t *minor)
{
RT_ASSERT(major != RT_NULL);
RT_ASSERT(minor != RT_NULL);
*major = cpu_usage_major;
*minor = cpu_usage_minor;
}
void cpu_usage_init()
{
/* set idle thread hook */
rt_thread_idle_sethook(cpu_usage_idle_hook);
}