You may also want to take a look at the PostThreadMessage API, which you
can use to signal from a thread back to the main thread or vice versa
HTH
David
On 15/05/12 18:53, Jolyon Smith wrote:
Do your UI updates on the main thread and find some other way of
communicating what the UI thread needs to update itself. i.e.
decouple your UI from the data it visualises.
PreloadSong;
WaitForEngine; // does a LoopSleep
SetCuePosition;
WaitForEngine;
StartPlay;
etc.
Do this in a worker thread then your UI can continue to update on the
main thread without having to worry about anything else. You're right
that the VCL isn't thread safe, but it's easier to make your data
sources thread safe so that the VCL main thread can access them safely
along with any worker threads, than it is to try to make the main VCL
thread behave as if it were effectively multiple threads (which is
what you are trying to do by having it do work, update the UI AND pump
the message queue).
Also, the fact that your routine is called "WaitForEngine" suggests to
me that an event would be ideal in your situation. If accurately
named, that routine indicates that your worker thread is waiting for
some signal that the engine is ready, a signal that the engine can
send directly using an event (i.e. a TEvent - a thread synchronisation
object, not a TNotifyEvent or similar), rather than using a busy-wait
loop.
It may not be a solution as quick and easy as throwing in a call to
Application.ProcessMessages, but I am pretty confident that it will
absolutely be more robust in the long run.
At least, that's the way I'd tackle this problem.
:)
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