karl wrote:
> Hello Jens,
>
> If I am not to wrong I think nanosleep() and using one if the two realtime
> scheduling polices SCHED_RR or SCHED_FIFO,
> will sleep a normal kernel with highest precision, I think.
some of it is right but..
first.
check out man nanaosleep.
second.
nanosleep perform a busy wait when used in standard Linux if wait time
is less then 2ms and SCHED_RR or SCHED_FIFO is used (you have to bee
root to chose these scedular)
if used in RTLinux nanosleep and usleep does not perform a busy wait
but suspend the calling task. nanosleep is implemented using
pthread_suspend_np(). So in RTLinux its goes the POSIX way.
Linux does not follow the POSIX. (Read bugs in man nanosleep)
Sorry, but but there is no funktion that can perform a sleep less
then 1ms in Linux. the only method is busy wait if wait less then 2ms.
Anders Gnistrup
>
> Regards,
>
> Karl Janmar
>
> Jens Michaelsen wrote:
>
>
>>Does one of the books describe how to udelay a thread?
>>Tryed usleep() for non-rt which ends up with milli seconds :(
>>Once there was a extension to linux that should support udelays.
>>Where is it gone??
>>
>>Jens Michaelsen
>>
>>[EMAIL PROTECTED] schrieb am 31.08.01:
>>
>>>Jennings, Richard R wrote:
>>>
>>>
>>>>Can anyone suggest a good book on practical use of Posix threads
>>>>(pthreads) with example code, etc. All the books I have found seem
>>>>to be out of date or have not so good reviews.
>>>>
>>>
>>>I got a pure bible.
>>>
>>>Programming with POSIX Threads
>>>David R. Butenhof
>>>1997
>>>Addison-Wesley Professional Computing Series.
>>>
>>>Anders Gnistrup
>>>
>>>
>>>
>>>>Thanks,
>>>>Rich
>>>>
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>>>>.
>>>>
>>>>
>>>>
>>>
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