Ignotus Peverell 76796738c1 Clean server shutdown, generalizes usage of Weak (#700) ... * Clean server shutdown, generalizes usage of `Weak`. Introduces 2 main changes: * A shared `AtomicBool` that signals server shutdown. All server threads regularly check it to break out of their main loops when it changes to `true`. * Breaking of circular `Arc` references, which can never be destroyed, by downgrading to `Weak` instead. Only the main server keeps the `Arc` while all other components get the `Weak` variant. Both of these are required for all long-living structs to be cleanly destroyed. Note that in Rust this is fairly important as most resource-freeing logic is associated with `drop`, which is only called when said struct is free of scope or `Arc` references. Should address most of #536 (only need the stop hook to call `Server` shutdown). * Test for fast sync, followed by restart, followed by re-fast-sync * P2P test fix * Double sync taking too long for Travis, commenting out for now		2018-02-13 00:38:52 +00:00
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peer_handshake.rs	Clean server shutdown, generalizes usage of Weak (#700)	2018-02-13 00:38:52 +00:00