Hi, reading LeakFinder's code (version 0.1.1) I was puzzled by: """ if not hasattr(DB, '_lf_real_open'): # Patch DB with a way to block open operations. DB._open_lock = allocate_lock() def open(self, *args, **kw): self._open_lock.acquire() self._open_lock.release() return apply(self._lf_real_open, args, kw) DB._lf_real_open = DB.open DB.open = open """ Inside the redefined::open(), the lock is acquired and released before delegating to the original::open(). I wonder if: 1) That was done intentionally as a _step_on_the_break_ measure 2) acquire() or release() cause a desired side effect (despite 1), inside ZODB's inner-sanctum (that eludes me) 3) That was not the original intention, where apply() should come between acquire() and release() 4) none above (I'd appreciate to learn why) I've sent this mail to zope-dev because it was the only address mentioned in the source code. best regards, Rod Senra -- Rodrigo Senra MSc Computer Engineer rodsenra@gpr.com.br GPr Sistemas Ltda http://www.gpr.com.br