Corinna Vinschen 4195bae67f Cygwin: timerfd: implement fork semantics
- Puzzeling: Commit ec98d19a08c2e4678e8a6f40fea0c9bbeaa4a2c7
  changed ttstart to NO_COPY but kept all the code to handle
  fixup after fork.  Revert to not-NO_COPY and make timerfd
  fork work.

- On fixup_after_fork, keep timerfd timers and restart thread
  if they were armed in the parent.

- Move timerfd timer_trackers to cygheap.  Overload timer_tracker
  new and delete methods to handle timers accordingly.  This is not
  exactly required for fork, but exec will be grateful.

- Give up on TFD_TIMER_CANCEL_ON_SET for now.  There's no easy way
  to recognize a discontinuous change in a clock.

- Be paranoid when cleaning out ttstart.

- Fix some minor issues.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2019-01-16 15:33:51 +01:00
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