[Twisted-Python] Lock class using Deferreds
andrew-twisted at puzzling.org
Fri Mar 5 18:20:16 EST 2004
On Fri, Mar 05, 2004 at 11:19:01AM -0500, Itamar Shtull-Trauring wrote:
> class Lock:
> """A lock for event driven systems."""
I have very very similiar looking code on my harddisk... what inspired you
to write this? :)
> def release(self):
> """Release the lock.
> Should be called by whoever did the acquire() when the shared
> resource is free.
> assert self.locked
> self.locked = 0
> if self.waiting:
> # someone is waiting to acquire lock
> self.locked = 1
> d = self.waiting.pop(0)
In my version, I had a 'throttle' instance attribute:
d = self.queue.pop(0)
reactor.callLater(0, d.callback, self)
Considering I never actually *used* my version, this might be a premature
feature addition, though.
> def _releaseAndReturn(self, r):
> return r
I wonder if this convenience function should also call log.err if
isinstance(r, failure.Failure)? But that's probably just premature
featuritus again :)
So, where in Twisted is a good spot for it? twisted.internet.util?
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