Thomas Wouters added the comment: No, using preexec_fn leaves all kinds of races when mixing threads and processes (which is a bad idea, but people still sometimes do.) And no, restore_signals doesn't fix this; restore_signals only resets the signals the *Python interpreter itself* ignored: SIGFPE, SIGXFZ and SIGFSZ (and it defaults to True anyway.) It doesn't affect other signals at all, even if Python code ignored them.
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