Wed, 06 Jan 2010 18:14:16 +0100 wenzelm eliminated cache, which complicates the code without making a real difference (NB: deque_towards often disrupts caching, and daisy-chaining of workers already reduces queue overhead);
Wed, 06 Jan 2010 15:07:56 +0100 wenzelm tasks of canceled groups are considered "ready" -- enables to purge the queue from tasks depending on unfinished promises (also improves general reactivity);
Wed, 06 Jan 2010 13:14:28 +0100 wenzelm do not memoize interrupts;
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