I run qnx on the VMware.And the Sampling frequency of pcm capture is set to be 16000.The channel is 1.The fragsize is 
set to be 2048.Every time I request to read 2048 audio data.At this condition the time of every time select() should be 
64ms. 
But the problem is that the time of select()is not stability.Its time is "....30ms-94ms-30ms-94ms-30ms.....". 
Why? 
And I change the read size and fragsize.The result is same.one short time and one long time can be getted. there isnot a
 right time.