[fpc-pascal] Main thread wait and CheckSynchronize

Roland Schaefer roland.schaefer at fu-berlin.de
Sun May 16 19:24:53 CEST 2010

On 16.05.2010 16:01, Jonas Maebe wrote:
> On 14 May 2010, at 00:18, Roland Schaefer wrote:
>> Now, instead of busy waiting in the main thread loop (even with a Sleep
>> inserted), I'd rather have it idle wait until another thread needs to
>> synchronize. Is that possible?
> CheckSynchronize has a parameter "timeout" with the default value 0: http://www.freepascal.org/docs-html/rtl/classes/checksynchronize.html
> You can pass a different value to wait for a longer period of time (specify the number of milliseconds). There is no equivalent of "wait forever" though.

Thanks a lot! Setting it sufficiently high gives me exactly what I need.

One suggestion for the docs: I actually had (admittedly very quickly)
tried CheckSynchronize with a timeout before. However, the procedure
outclevered me, since for the test I didn't create any threads before
going into a loop with CheckSynchronize(2147483647). It just didn't seem
to work. Looking at classes.inc, I have now found out that it has sanity
checks which make it ignore the timeout when there are no threads
created. Shouldn't this be mentioned in the docs?

Thanks again

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