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Marek Vavrusa authored
* events now carry pointer to their scheduler * no event types, events are simple callbacks * removed unused or deprecated stuff * bugfix: zone never expired since expire was initialized on create * bugfix: race condition on rescheduling events - there is always some time between cancel and schedule - if two threads run run past the cancel and then race for schedule, they may rarely schedule an event two times - this is hard to deal with unless we place a lock on the zone operations, therefore each schedule checks heap if the event is not already scheduled and if it is, it replaces the old instance
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