[Python-Dev] Release or not release the GIL

Charles-François Natali cf.natali at gmail.com
Fri Feb 1 14:37:35 CET 2013

>> dup2(oldfd, newfd) closes oldfd.
> No, it doesn't close oldfd.
> It may close newfd if it was already open.

(I guess that's what he meant).

Anyway, only dup2() should probably release the GIL.

One reasonable heuristic is to check the man page: if the syscall can
return EINTR, then the GIL should be released.

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