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Need a suggestion about mouse processing inside threads [message #34800]

Tue, 13 December 2011 00:53

mdelfede
Messages: 1307
Registered: September 2007

Ultimate Contributor

Hi, I've a multi-document application, on which each document runs a threaded command loop :

// document command loop
void UppCadDocument::commandLoop(void)
{
	// loop not ended
	INTERLOCKED_(mutex)
	{
		loopEnded = false;
	}
	while(!Thread::IsShutdownThreads())
	{
	
		if(commandLine.HasCommand())
		{
			String cmd = commandLine.GetCommand();
			if(cmd != "<ESC>" && cmd != "")
				SendCommand(cmd);
		}
		Sleep(100);
	}
	// loop ended
	INTERLOCKED_(mutex)
	{
		loopEnded = true;
	}
}

Here, handling of commandLine (some sort of InputField) is simple; the problem arise when I've to react to mouse events; main thread can call, for example, MouseMove() on any time in the middle of anything of my document's loop.

How to synchronize it ? I can't stop my main thread waiting for a document's one is ready for event, of course... I think I'd need some sort of event-loop inside document's threads, and main thread should inject its events on it, instead executing calls directly, but how ?
This is exactly the opposite problem as the one solvable with Guilock....

My idea would be something like this :

Main thread :

void SomeEventHandler(somedata)
{
    GetActiveDocument().InjectEvent(eventtype, somedata);
}

Document thread :

while(true)
{
    WaitForInjectedEventsWithoutEatingCpu();
    while(eventsInQueue)
        ProcessPendingEvents()
}

Is there something in upp that can help for all that, or I should code it using arrays of callbacks or something like that ?
Or there's a better solution ?

Max

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