Can't sleep less than 20 ms

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I know Linux on i386 has a timer resolution of 10 ms, but
why I can't sleep for 10 ms, I can only sleep at
interval of 20 , 30, 40 ... ms.

This what happpends

usleep ( <= 10*1000) will sleep for 20 ms
usleep ( <10*1000 <= 20*1000) will sleep for 30 ms
usleep ( <20*1000 <= 30*1000) will sleep for 40 ms

I'm runing 2.2.10.

Thanks.

Dong

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