Guido van Rossum added the comment: Actually, I think we're talking about the actual select() syscal not returning when SIGCHLD is received and handled. Running the C-level handler isn't enough, the syscall must return with EINTR so the Python handler can run (which then writes a byte to the self-pipe to ensure select() returns, but that seems too late). Maybe twiddling with SA_RESTART can fix this?
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