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Attila Kovacs

freeing an object in different process

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Posted (edited)

is it ok regarding to multithread design pattern to free an object in a different process thread as it was created in?

 

Seems to work, but are there any caveats?

function TfrmSync.NewCookieList: TclCookieList;
begin
  Result := TclCookieList.Create(nil, TclCookieItem);
  Result.Assign(FCookies);
end;

mainthread
begin
  ...
  Fpipeline := Parallel.pipeline.Stage(Retriever, ....)...Run;
  Fpipeline.input.Add(TRetrieverParam.Create(..., NewCookieList));  <---- New instance
  ...
  Fpipeline.input.CompleteAdding;
end;

procedure TfrmSync.Retriever(const input: TOmniValue; var output: TOmniValue);
begin
.....
TRetrieverParam(input).CookieList.Free;   <---- EOL
end;

 

Edited by Attila Kovacs

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No caveats for above code. You can freely Free object instance from different thread than one where it is created.  

 

Problem would arise if you would have object instance that is being simultaneously accessed by multiple threads.

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