Jean-Paul Calderone <exar...@twistedmatrix.com> added the comment: One open question regarding interaction with threading. sigprocmask's behavior in a multithreaded program is unspecified. pthread_sigmask should be used instead. I could either expose both of these and let the caller choose, or I could make signal.sigprocmask use pthread_sigmask if it's available, and fall back to sigprocmask. I don't see any disadvantages of doing the latter, and the former seems like it would create an attractive nuisance. However, I don't have much experience with sigprocmask; I'm only interested in it because of its use in combination with signalfd.
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