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Add a function timerfd_tracker::enter_critical_section_cancelable, which is like enter_critical_section but honors a cancel event. Call this when a timer expires while the timerfd thread is in its inner loop. This avoids a deadlock if timerfd_tracker::dtor has entered its critical section and is trying to cancel the thread. See https://cygwin.com/ml/cygwin/2019-06/msg00096.html.
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