bpo-30643: Fix race condition in signal wakeup in forkserver (followup to PR #1989) #2139
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…hon#1989) There's an admittedly well-known race condition where ECHILD can arrive just before the C function epoll_wait() and the latter wouldn't therefore return EINTR. The solution is to use set_wakeup_fd(), which was designed to avoid such race conditions.
vstinner
changed the title
vstinner
reviewed
Jun 13, 2017
| try: | ||
| os.write(sig_w, b'.') | ||
| except BlockingIOError: | ||
| pass |
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I like this change :-) Using the existing C signal handler for the write is probably more reliable ;-)
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There's an admittedly well-known race condition where ECHILD can arrive just before the C function epoll_wait() and the latter wouldn't therefore return EINTR. The solution is to use set_wakeup_fd(), which was designed to avoid such race conditions.