about rt-task period

[qiao <at80401@yahoo.com>]

hello

   when testing if the periodis too short,I find the code below do not work
correctly
-----------------------------------
int overrun = 0;
do{
	pthread_wait_np();
	if(overrun) {
	   conpr("overrun!\n");
	   break; 
	}
	overrun++;
	/* calculation code */

	overrun--;

  }while(1);
------------------------------------
for example, the calculation elapse 17 us, I set period=20us,
the min,max value(actual period minus 20us)  is about 2.6 , 
9us /*see examples/measurement/rt_process.c*/,but if  set period=10us, 
the min,max is about 23,30us , greater than perid! "overrun" doesn't 
work, why?

thanks.

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