Martin v. Löwis <mar...@v.loewis.de> added the comment:

You should use begin/end allow threads when the system call might block. To get 
an indication, trace through the kernel code of some system; my guess is that 
these are typically non-blocking (i.e. return immediately) - but I might be 
wrong.

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<http://bugs.python.org/issue10784>
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