Delay registration of the timer and signal fds until running the loop first time
Summary: Delay registration of the timer and signal fds until running the loop first time On some Linux kernel versions, io_uring will remove any fd registrations on thread exit. So creating the backend in a thread that exits later will cause us not to receive timer and signal fd events. Reviewed By: kevin-vigor Differential Revision: D26200805 fbshipit-source-id: dc3025964deb3cf87bf3e5a27141abcdb8698caf
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