[Mono-dev] Mono-Debugger: Multiple threads and SingleSteppingEngines?

Martin Baulig martin at ximian.com
Tue Apr 28 03:26:21 EDT 2009

On Wed, 2009-04-22 at 10:43 +0200, jonas echterhoff wrote:
> I got debugging of multi-threaded applications to work in OS X, as in  
> supporting it on the backend. But what I don't quite get yet is how  
> multi-threaded applications should be handled and represented inside  
> the debugger. In ThreadManager.cs, there is a comment:
> 		//   For each application we're debugging, there is just one  
> SingleSteppingEngine,
> 		//   no matter how many threads the application has.  The engine is  
> using one single
> 		//   event loop which is processing commands from the user and  
> events from all of
> 		//   the application's threads.
> Somehow, it seems to me that this is not really the case. In  
> ProcessServant.ThreadCreated (which is called when a new thread is  
> created by the application):
> 			SingleSteppingEngine new_thread = new SingleSteppingEngine (
> 				manager, this, new_inferior, pid);
> Seems to contradict that. Looking at the code, I assume the above  
> comment is wrong. It appears that the debugger will create one  
> SingleSteppingEngine plus Inferior for each thread. Am I right?

Hi Jonas,

yes, that's right - there's one SingleSteppingEngine and one Inferior
created by thread.

Sorry for not answering earlier, I was away on vacations last week.
I'll also have a look at your patch asap.


> jonas

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