linux Sleep command

[Daniel Shawul]

Hi
Is there an equivalent function for the
windows Sleep command in linux?
i use Sleep(0) to give up time slice for threads.
Also what is the equivalent test and set operation for linux?(IE InterlockedExchange in windows).
if there is a free portable library, i would like to use it.
someone suggested PostgreSql, but i can't locate where the files are.
thanks in advance
daniel

[Alessandro Scotti]

Hi Daniel,
you can try usleep on Linux. I use usleep(1000) as equivalent to Sleep(1).

[Sven Schüle]

Hi Daniel,
you can try usleep on Linux. I use usleep(1000) as equivalent to Sleep(1).

Hi Alessandro,

does Sleep(N) sleep N seconds or N milliseconds on Windows? If "N seconds" is correct then you should use usleep(1000000) on Linux because usleep(U) sleeps U microseconds.

Sven

[Alessandro Scotti]

does Sleep(N) sleep N seconds or N milliseconds on Windows? If "N seconds" is correct then you should use usleep(1000000) on Linux because usleep(U) sleeps U microseconds.

Hi Sven,
Sleep() uses milliseconds on Windows. In my case I use Sleep(1) to yield the rest of the time slice, however this may not apply directly to Daniel because he's using Sleep(0) and that behaves differently in Windows. When I ported the engine to Unix I used usleep(1000) as a simple translation of Sleep(1) but did not investigate further if and how smaller intervals would work. For the use I do, wasting one millisecond is not much important! Daniel may need to look better into this though.

[Daniel Shawul]

Hi alessandro
you are right, i can't use Sleep(1). It is done inside search and
I assumed there will probably be an equivalent sleep command when
i started.
I managed to find some linux kernel spinlocks on the net,
but unfortunatley this has to be done for each platform.
I guess i will leave it up to linux users to add their own locks
thanks anyways
daniel

[Dann Corbit]

Hi alessandro
you are right, i can't use Sleep(1). It is done inside search and
I assumed there will probably be an equivalent sleep command when
i started.
I managed to find some linux kernel spinlocks on the net,
but unfortunatley this has to be done for each platform.
I guess i will leave it up to linux users to add their own locks
thanks anyways
daniel

You might look at the Berkeley licensed PostgreSQL kernel.
They have spinlocks in there for just about every platform.