[Lazarus] Using semaphores to limit thread access

[Sven Barth]

Am 19.07.2015 18:33 schrieb "kapibara" <kapibara.pas at aol.com>:
>
> Hi guys
>
> A number of threads need to access an object, but no more than three
threads must access simultaneously.
>
> Thats a job for a semaphore someone said. I understand that under Delphi
and Windows something like this could be used:
>
> FSemaphoreHandle := CreateSemaphore(nil, 3, 3, nil);
> WaitForSingleObject(FSemaphoreHandle, <timeout>);
>
> How to do that under Lazarus and Linux?
>
> I have found TThreadManager with its SemaphoreInit and SemaphoreWait etc.
But how to use it, especially how do you specify the number of threads that
can access the object?
>
> Using 32 bit Lazarus trunk and FPC trunk.

FPC does not yet have a public semaphore API. The functions in
TThreadManager are only implemented on Unix systems ans only used for
specific purposes inside the RTL.

Regards,
Sven
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