Is using single TSynLog object in multiple threads considered safe?

edwinsn · 2014-06-09 08:14:55

Hello Arnaud,

In a TThread object (TMainThread) I have a TSynLog object (not class):

TMainThread = class
  FLogObj: TSynLog;
  ...
end;

And when this TMainThread object is executed, it'll spawn 'sub-threads'.

My question is, is it considered to be safe if those 'sub-threads' also using the FLogObj object of their 'parent-threads'? For example:

  //We use OmniThreadLibrary in this example
  Parallel.ParallelTask.NumTasks(aTaskCount);
  myTasks.Execute(
    //The following anonymous method will be executed in sub-threads and will have multiple instances determined by the aTaskCount param.
    procedure (const task: IOmniTask)
    begin
      //note: here FLogObj is a field of the parent thread.
      FLogObj.Log(sllInfo, 'testing');
    end
  )

I read that TSynLog is thread-safe, but I'm not sure if the way I use is thread-safe or not, I appreciate your help!

Edit 1: Some basic tests shows that the above code runs OK without any access violation errors, but I have not done massive (stress) tests.

Last edited by edwinsn (2014-06-09 08:21:09)

ab · 2014-06-09 08:19:10

You can safely share the tsynlog instance among threads.

You can identify each thread in the log by the corresponding setting.

edwinsn · 2014-06-09 09:34:36

Thanks for the clarification, ab!

mORMot Open Source

#1 2014-06-09 08:14:55

Is using single TSynLog object in multiple threads considered safe?

#2 2014-06-09 08:19:10

Re: Is using single TSynLog object in multiple threads considered safe?

#3 2014-06-09 09:34:36

Re: Is using single TSynLog object in multiple threads considered safe?

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