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Ken Brown fefdf88589 Cygwin: FIFO: make opening a writer more robust
- Make read_ready a manual-reset event.

- Signal read_ready in open instead of in the listen_client_thread.

- Don't reset read_ready when the listen_client thread terminates;
  instead do it in close().

- Rearrange open and change its error handling.

- Add a wait_open_pipe method that waits for a pipe instance to be
  available and then calls open_pipe.  Use it when opening a writer if
  we can't connect immediately.  This can happen if the system is
  heavily loaded and/or if many writers are trying to open
  simultaneously.
2020-10-14 10:54:18 -04:00
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