Message 209019 - Python tracker (original) (raw)

Le 24 janv. 2014 00:08, "Antoine Pitrou" <report@bugs.python.org> a écrit :

For example, it may call again epoll_wait() if it took less than timeout seconds and returned no event, and the ready list is empty.

Easy solution: add 1 ms. to the timeout before calling epoll_wait(). Perhaps we need the same kind of thing for select() and poll() too.

It doesn't fix the case when EpollSelector.select() got an InterruptedError.

Adding 1 ms works around the (now fixed) timeout rounding issue but I prefered to round differently to not sleep longer than requested (try to respect deadline).

About the "system clock", it's possibke than Linux uses a different clock for epoll_wait() than CLOCK_MONOTONIC, and than clocks have a different resolution.

I didn't test the rounding issue on Windows where time.monotonic() has a resolution between... 1 and 16 ms!