[issue1583] Patch for signal.set_wakeup_fd

[Jeroen Demeyer]

Jeroen Demeyer <J.Demeyer at UGent.be> added the comment:

> Back in 2007 the only POSIX-compliant type allowed for that was sig_atomic_t, anything else was undefined.

Fair enough, but having a non-atomic type is still much better than a completely wrong type. In other words, the requirement of fitting a file descriptor is more important than being atomic.

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<https://bugs.python.org/issue1583>
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