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* event: use sync.Once for init for faster/cleaner lockingPéter Szilágyi2017-02-031-11/+5
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* event: address review issues (multiple commits)Felix Lange2017-02-031-11/+20
| | | | | | | | | | | | | event: address Feed review issues event: clarify role of NewSubscription function event: more Feed review fixes * take sendLock after dropping f.mu * add constant for number of special cases event: fix subscribing/unsubscribing while Send is blocked
* event: add new Subscription type and related utilitiesFelix Lange2017-01-261-0/+240
This commit introduces a new Subscription type, which is synonymous with ethereum.Subscription. It also adds a couple of utilities that make working with Subscriptions easier. The mot complex utility is Feed, a synchronisation device that implements broadcast subscriptions. Feed is slightly faster than TypeMux and will replace uses of TypeMux across the go-ethereum codebase in the future.