tor/changes/detect-full-queues

  o Major bugfixes:
    - Newly created streams were allowed to read cells onto circuits,
      even if the circuit's cell queue was blocked and waiting to drain.
      This created potential unfairness, as older streams would be
      blocked, but newer streams would gladly fill the queue completely.
      We add code to detect this situation and prevent any stream from
      getting more than one free cell.  Bugfix on 0.2.0.1-alpha.
      Possible partial fix for bug 1298.
Detect if we try to put a cell onto a supposedly blocked cell queue. When this happens, run through the streams on the circuit and make sure they're all blocked. If some aren't, that's a bug: block them all and log it! If they all are, where did the cell come from? Log it! (I suspect that this actually happens pretty frequently, so I'm making these log messages appear at INFO.) 2010-08-18 20:20:49 +02:00			`o Major bugfixes:`
			`- Newly created streams were allowed to read cells onto circuits,`
			`even if the circuit's cell queue was blocked and waiting to drain.`
			`This created potential unfairness, as older streams would be`
			`blocked, but newer streams would gladly fill the queue completely.`
			`We add code to detect this situation and prevent any stream from`
			`getting more than one free cell. Bugfix on 0.2.0.1-alpha.`
			`Possible partial fix for bug 1298.`