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Ken Brown 9604a251bd Cygwin: timerfd: avoid a deadlock
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.
2019-06-25 15:44:43 -04:00
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2019-06-25 15:44:43 -04:00