Date: Fri, 22 Feb 2008 14:37:48 +0100 From: "Heiko Wundram (Beenic)" <wundram@beenic.net> To: freebsd-hackers@freebsd.org Subject: Re: usleep Message-ID: <200802221437.48293.wundram@beenic.net> In-Reply-To: <200802221558.42443.sharadc@in.niksun.com> References: <200802221558.42443.sharadc@in.niksun.com>
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Am Freitag, 22. Februar 2008 11:28:42 schrieb Sharad Chandra: > Does usleep work for you? i just saw it is implemented over nanosleep > which passes a struct timeval to "select". Quoting from POSIX: """ The usleep() function will cause the calling thread to be suspended from execution until either the number of real-time microseconds specified by the argument useconds has elapsed or a signal is delivered to the calling thread and its action is to invoke a signal-catching function or to terminate the process. The suspension time may be longer than requested due to the scheduling of other activity by the system. """ See the last sentence, specifically. So, yes, the behaviour you're seeing is pretty much expected, simply because _user_ processes are scheduled in timeslices, which depend on the HZ setting of the kernel. -- Heiko Wundram Product & Application Development
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