E&S CVS Commit: PEAK - Added first draft 'RLock' and 'ResourceManager' classes that implement the

[pje at eby-sarna.com]

Module Name:	PEAK
Committed By:	pje
Date:		Mon Feb 24 21:26:07 UTC 2003

Modified Files:
	PEAK/src/peak/util: threads.py

Log Message:
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.


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