[Lazarus] PostMessage return value

[Mattias Gaertner]

On Mon, 15 Sep 2014 21:57:40 +0800
Xiangrong Fang <xrfang at gmail.com> wrote:

>[...]
> That's exactly what I planed to do. But I don't know "CriticalSections" can
> be used in here.  My original thinking is that, by the end of Execute, I
> call either PostMessage or QueueAsyncCall to notify main thread that the
> current thread finished its work.  The main thread, in its message handler
> then know from a status variable that this thread is in suspended status,
> then assign a new work to it and call its Execute() method again.

Then write your thread Execute as a loop, calling Synchronize.
Synchronize pauses the thread, waiting for the main thread, calling the
method in the main thread, when method ended continuing thread.

See
http://wiki.freepascal.org/Multithreaded_Application_Tutorial

Mattias