[Lazarus] PostMessage return value

Michael Schnell mschnell at lumino.de
Thu Sep 18 11:32:40 CEST 2014

On 09/18/2014 10:32 AM, Xiangrong Fang wrote:
> Yesterday I read your ThreadPool source code, and cannot understand 
> how you control which thread can get the "Wait" CS, rather than just 
> let the 2 thread compete for it. Could you please explain the logic 
> behind this?
Each worker Thread (i.e. the TThreadPoolThread instance) has it's own 
"Wait" semaphore (TCriticalSection instance).

The semaphore is owned by the main thread while the worker thread is 
supposed to do hold off, waiting to be assigned any work by setting the 
appropriate element of the "Tasks" property.

The semaphore is owned by the worker thread when it is working (as 
easily seen in the Execute procedure.


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