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How to quit circular async loop?

Hello,

My application uses a separate thread to do consecutive async reads from a device. I am using a circular buffer configuration in which the thread initially calls 4 reads and then there are 4 callbacks, each callback immediately calls another read. It runs fine.

However, i'm a little confused as to how I should stop all this once it is going. Is calling CFRunLoopStop(CFRunLoopCurrent()) from one of the callbacks enough? Or should I call it from every call back? The callbacks are called sequentially as the reads are completed. I'm not sure if once CFRunLoopStop is called from one of the callbacks, all the reads stop and CFRunLoop() returns in the original thread or not. This is confusing to me because it seems like there are still waiting async USB calls, that will try to do callbacks. Should I be calling ClearPipeStall()?

My program communicates with the threads using a single variable, when my program sets it to a particular value, the callbacks know it's time to stop. The question is how to do it correctly.

Thanks for any help.
Juan
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