Andriy Mysyk added the comment:
Incorporated R. David Murray's feedback...
.. method:: acquire(blocking=True, timeout=-1)
Without any optional argument, this method acquires the lock
unconditionally, if necessary waiting until it is released by another
thread (only one thread at a time can acquire a lock).
If *blocking* is ``False``, the call returns immediately. If *blocking*
is ``True``, the lock is acquired unconditionally. In both cases
the return value indicates whether or not the lock was acquired.
If the floating-point *timeout* argument is present and positive, it
specifies the maximum wait time in seconds before returning; the return
value indicates whether or not the lock was acquired. A negative
*timeout* argument specifies an unbounded wait and is the same as not
specifying a *timeout* and also setting *blocking* to ``True``. A zero
*timeout* is the same as not specifying a *timeout* and setting *blocking*
to ``False``. You cannot specify a *timeout* if *blocking* is ``False``.
The return value is ``True`` if the lock is acquired successfully,
``False`` if not.
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Added file: http://bugs.python.org/file30184/issue17858.patch
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