How to execute not TThread based thread in main thread?

Question

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.

naXa stands with Ukraine · Accepted Answer · 2014-07-05 10:36:09Z

8

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.

edited Jul 5, 2014 at 10:36

naXa stands with Ukraine

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answered Apr 6, 2013 at 21:20

David Heffernan

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8 Comments

user2091150 Over a year ago

TThread.Synchronize requires TThread object, but callback just procedure with different thread id.

David Heffernan Over a year ago

Not so. The methods I refer to are class methods and so do not need an instance.

user2091150 Over a year ago

[DCC Error] UnitMain.pas(130): E2389 Protected member 'TThread.Synchronize' is inaccessible here (Delphi XE2) on TThread.Synchronize(qt.SendEvent)

David Heffernan Over a year ago

You need the two parameter version and pass nil as the first param.

user2091150 Over a year ago

It never able to execute function and never able to execute line 12181 TMonitor.Exit(ThreadLock); in System.Classes after TMonitor.Wait(SyncProcPtr.Signal, ThreadLock, INFINITE) when I trying to do that in dll.

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