🚀 go-pugleaf

"Wim Bekker" <wim@bekker> wrote in message
news:3f77f4b0@newsgroups.borland.com...
>
> "Remy Lebeau (TeamB)" wrote:
> > No.  Use Synchronize() to access the Canvas.
> >
> > Preferably, anything related to the GUI should be done in the main
thread.
>
> Thanks Gambit. For most part I will not use the Synchronize method as it
> could halt the thread until the main-thread handles the request. Instead,
I
> copy all needed values into a thread-safe place and signal the main thread
> that there's info available (PostMessage). This works perfectly and allows
> the heavy duty thread to perform best.
>

This is a good technique;  it's one I've used regularly.  One potential
issue
to be aware of is ensuring that the worker thread does not access the
"needed values" while the main thread is using them.  I presume this is
what you mean by a "thread-safe place" eg the needed values
are protected by a critical section.  There is a slight performance
overhead with this (it is just a cost of preventing things like
race conditions).

Your statement about the Synchronize() method needs to be stronger:
it *will* halt the worker thread until the main thread handled the request.
That is the whole purpose of the method.