Re: Short sleeps.

[Steve Baker <sjbaker1@airmail.net>]

Mark Collins wrote:
> 
> On Friday 11 January 2002 12:59 am, you wrote:
> <snip>
> 
> I'm not sure about LInux, but I'm sure it has an equivilent to this:
> 
> ====
> perf_freq = QueryPerformanceFrequency();
> 
> start_time = QueryPerformanceTimer()/perf_freq;
> 
> while ((end_time - start_time) > delay) {
>         end_time = QueryPerformanceTimer()/perf_freq;
> }
> =====
> 
> Where the QueryPerformanceTimer() function is a high-resolution clock  I
> can't find details about the Linux equiv, but surely it exists?

Yes - sure there is an equivelant - but that's a busy-wait which
prevents other processes from running - something that I explicitly
wish to avoid.

Linux's nanosleep() will do busy-waits for up to 2 milliseconds - or
you can do as you did by looping on gettimeofday or something and get
microsecond precision busy-waits.

However, I want to actually give up the CPU while I'm waiting.

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