[Lazarus] How to PostMessage to object?

[Krzysztof]

Ok, I did not notice that exists method TApplication.RemoveAsyncCalls(const
AnObject: TObject). Anyway it's strange that AnObject param is compared to
Data param from QueueAsyncCall, not to AMethod, but this is not a problem.

2011/6/8 Krzysztof <dibo20 at wp.pl>

> Ok, this can be done with critical section but what with AV scenario?
> Example:
> 1. Thread add queue calling Application.QueueAsyncCall(MyObj.EventMethod,
> 0);
> 2. MyObj is destroyed by main thread
> 3. Main thread process messages and try call queue added by thread but
> reference to MyObj.EventMethod was destroyed by previous message loop. This
> cause Access Violation.
>
> I could remove this queue in MyObj destructor but TApplication.FAsyncCall
> is in private section :/
>
> 2011/6/8 Henry Vermaak <henry.vermaak at gmail.com>
>
>> On 08/06/11 16:28, Krzysztof wrote:
>>
>>> Hm, I forgot about Application.QueueAsyncCall. And this can be safely
>>> call from thread without TThread.Synchronize() ? Because I don't want
>>> use Synchronize() in any part of thread code. So this is correct code? :
>>>
>>> procedure TMyThread.Execute;
>>> begin
>>>   // <some code here>
>>>   Application.QueueAsyncCall(@SomeObj.TestMethod, PtrInt(NewStr('Some
>>> value')));
>>>   // <some code here>
>>> end;
>>>
>>> There is no chance for deadlock with main thread calling this from
>>> inside another thread?
>>>
>>
>> You have to protect it with a critical section (if you have more than one
>> thread calling QueueAsyncCall).
>>
>> Henry
>>
>>
>> --
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>
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