eryksun added the comment:

This also hangs for me in 2.7.8 64-bit, Windows 7. To poll the pipe, the parent 
process calls PeekNamedPipe, which blocks because the child has already called 
ReadFile.

> It is possible that the problem is also present in Python 3.

multiprocessing switched to overlapped I/O in 3.3, which avoids this problem.

----------
nosy: +eryksun

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<http://bugs.python.org/issue22976>
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