Log of /PEAK/src/peak/util/threads.py

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Added first draft 'RLock' and 'ResourceManager' classes that implement the
PEAK locking interface (attempt/obtain/release/locked) in a re-entrant
fashion for a single resource or an address space.  The idea is that we
will use a 'ResourceManager' to handle internal locks on addresses (such as
filenames) that refer to external resources, by calling
'someRM.obtain("some URI")' to lock the resource, etc.  The lockfiles in
'peak.running.lockfiles' should be changed to use this approach, so that
even independent lockfile instances share the same actual threadlock.
Also, we can use this when we begin implementing filesystem DM's (such as
the one we need for writing XMI files).

None of this code is tested; we really need a good unit test suite for
the entire 'threads' module.

Fleshed-out the implementation of the 'waitflag' argument, emulating the
exact values returned by Python in different states, and added a
RuntimeError for an attempt to lock an already-locked DummyLock.  Also,
renamed LockType to DummyLock to more easily distinguish from the real
thing when debugging, and made DummyLock a bit more lightweight using
__slots__.

Allow waitmode to be passed to no-op lock acquire().

Make this work in the HAVE_THREADS==False case

Added thread-safety utility module, and modified UUID creation to use it.