Official Go implementation of the Ethereum protocol

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Martin Holst Swende edb1937cf7 core: improve shutdown synchronization in BlockChain (#22853) ... This change removes misuses of sync.WaitGroup in BlockChain. Before this change, block insertion modified the WaitGroup counter in order to ensure that Stop would wait for pending operations to complete. This was racy and could even lead to crashes if Stop was called at an unfortunate time. The issue is resolved by adding a specialized 'closable' mutex, which prevents chain modifications after stopping while also synchronizing writers with each other. Co-authored-by: Felix Lange <fjl@twurst.com>		3 years ago
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mutex.go	core: improve shutdown synchronization in BlockChain (#22853)	3 years ago