Tim Peters added the comment:
Well, when a timeout is specified, .join() passes exactly the timeout passed to
_it_ to ._wait_for_tstate_lock(), which in turn passes exactly the same timeout
to .acquire(). So the negative value must be coming from _communicate() (the
self.stdout_thread.join(self._remaining_time(endtime))
line).
_remaining_time() in turn:
def _remaining_time(self, endtime):
"""Convenience for _communicate when computing timeouts."""
if endtime is None:
return None
else:
return endtime - _time()
So that just subtracts and doesn't do anything to ensure the result is
positive, nor does the calling site check the return value. Most other
_remaining_time() calls in subprocess.py *do* check the return value, so I
think this is clearly a subprocess.py bug.
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<http://bugs.python.org/issue19399>
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