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ReadPipeAsync in a Cocoa App

Hi,
I am writing a class to connect to a Garmin GPS unit (forerunner 301) and have been reading through the list archives to try and find some answers but haven't been able to find anything. In the sample project USB Simple Example it shows how to use the run loop to wait for the event, but I can't seem to conceptually understand how to work it in a multi-threaded environment where the worker thread already contains a run loop.

The current pattern I use when connecting to a device is to spin off a thread that talks to the actual device and the two threads communicate via an NSPort.

eg. (pseudo code typed in Mail)

- (id)init
{
_port = [[NSPort port] retain];
[_port setDelegate:self];
[NSThread detachNewThreadSelector:@selector (runBackgroundThread:) .....];
}

- (void)runBackgroundThread:(id)notUsed
{
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

[[NSRunLoop currentRunLoop] addPort:_port forMode:(NSString *) kCFRunLoopCommonModes];
[[NSRunLoop currentRunLoop] run];

[pool release];
}

So the problem as I see it is that because the worker thread's runloop has the NSPort as a source, then if I were to call the runloop run/stop like in the example, it is not going to return. I'm just wanting to know how people over come this or am I missing something?

Any information is greatly appreciated.

Regards,
Greg
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