Why doesn't pipe.close() cause EOFError during pipe.recv() in python multiprocessing?

I am sending simple objects between processes using pipes with Python's multiprocessing module. The documentation states that if a pipe has been closed, calling pipe.recv() should raise EOFError. Instead, my program is just blocking on recv() and never detects that the pipe has been closed.

Example:

import multiprocessing as m

def fn(pipe):
    print "recv:", pipe.recv()
    print "recv:", pipe.recv()

if __name__ == '__main__':
    p1, p2 = m.Pipe()
    pr = m.Process(target=fn, args=(p2,))
    pr.start()

    p1.send(1)
    p1.close()  ## should generate EOFError in remote process

And the output looks like:

recv: 1
<blocks here>

Can anyone tell me what I'm doing wrong? I have this problem on Linux and windows/cygwin, but not with the windows native Python.