Fix InterruptStop if called before InterruptRead #116
Merged
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The goal is to make the polling termination (via
TAG_IFD_STOP_POLLING_THREAD) actually work even when it's triggered before the InterruptRead has a chance to create and publish the polling_transfer.
Without this patch, in some cases the termination was blocked for 10 minutes, because the thread that does InterruptStop might still see the null polling_transfer meanwhile the other thread is about to start this transfer. The proposed solution is to remember in a separate (atomic) boolean flag whether the termination started, to avoid this kind of race condition.