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A semaphore for event driven systems.
If you are looking into this as a means of limiting parallelism, you might find
twisted.internet.task.Cooperator more useful.
||Attempt to acquire the token.|
||Release the token.|
||At most this many users may acquire this semaphore at once.|
||The difference between limit and the number of users which have currently acquired this semaphore.|
||Remove a deferred d from our waiting list, as the deferred has been canceled.|
||We can be used as an asynchronous context manager.|
||Acquire, run, release.|
Release the token.
Should be called by whoever did the
acquire() when the shared resource is free.
The difference between limit and the number of users which have currently acquired this semaphore.
Remove a deferred d from our waiting list, as the deferred has been canceled.
Note: We do not need to wrap this in a try/except to catch d not being in self.waiting because this canceller will not be called if d has fired. release() pops a deferred out of self.waiting and calls it, so the canceller will no longer be called.
|d:||The deferred that has been canceled.|