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For example from thread provided by callback from CreateTimerQueueTimer in executable or dll? It is significant to have same thread id as main thread.
procedure TMyMainClass.ExecuteMe(someparam: paramtype);
begin
{something}
end;
and
procedure TimerCallback(pvContext: pointer; fTimerOrWaitFired: boolean); stdcall;
begin
{do what ?}
end;
Final update:
All this stuff (TThread.Synchronize, TThread.Queue, PostThreadMessage etc) works through messages. So be sure host application of your dll processing messages while waiting for callback.
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If you put long running work on the UI thread, you can get ANR errors. If you have multiple threads and put long running work on the non-UI threads, those non-UI threads can't inform the user of what is happening.
You can not stop the main thread while any other thread are running. (All the child threads born out of main thread.) You can use function Thread. join() to keep the main thread waiting while other thread(s) execute.
A thread can be created by implementing the Runnable interface and overriding the run() method. The Main thread in Java is the one that begins executing when the program starts.
You cannot tell the thread scheduler which order to execute threads in. If you need to ensure that a certain piece of code which is running on thread A must run before another piece of code running on thread B, you must enforce that order using locks or wait() / notify() .
To execute code in the main thread, without access to a TThread instance, call the class methods TThread.Synchronize or TThread.Queue.
If you happen to be using an old Delphi compiler that does not have those methods, then SendMessage or PostMessage with a user defined message are the simplest solution.
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