Subj : Re: pthread_cond_timedwait problems
To   : comp.programming.threads
From : Ian
Date : Sun Aug 14 2005 12:02 pm

markh@compro.net wrote:
> Actual usec delay from timer =  2059 usecs
> 
> Its obvious it takes gettimeofday around 70 usecs to complete but
> both the timings are bogus. The rtom should show 100 and the
> gettimeofday
> should be around 170.
> 
> Ok lets try 1000000ns (1000us)
> 
> Attempting  delay of 1000000 nsec (1000 usecs)
> gettimeofday reported delay  =  2225 usecs
> Actual usec delay from timer =  2164 usecs
> 
> 
> Whats going on here???? I don't see anything wrong with the program.
> Is there something wrong here with this code or is a BUG??
> 
You are attempting to delay for less than a system tick (what ever that 
is on your system, typical value would be 10mS), so you are seeing 
something between 0 and one tick.

Why not use nanosleep?  Same conditions regarding minimum interval apply 
though.

Ian

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