From acd2c4e52028ec1e34358d6d79ada7812723b32e Mon Sep 17 00:00:00 2001 From: Jeffrey Wilcke Date: Sat, 1 Aug 2015 12:32:28 +0200 Subject: [PATCH] core: added a running flag to prevent panics in the chainmanager The running flag will determine whether the chain manager is still running or not. This will prevent the quit channel from being closed twice resulting in a panic. This PR should fix this issue. Closes #1559 --- core/chain_manager.go | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/core/chain_manager.go b/core/chain_manager.go index c2e89a10d9..0362e5ccc1 100644 --- a/core/chain_manager.go +++ b/core/chain_manager.go @@ -76,7 +76,8 @@ type ChainManager struct { cache *lru.Cache // cache is the LRU caching futureBlocks *lru.Cache // future blocks are blocks added for later processing - quit chan struct{} + quit chan struct{} + running int32 // running must be called automically // procInterrupt must be atomically called procInterrupt int32 // interrupt signaler for block processing wg sync.WaitGroup @@ -443,6 +444,9 @@ func (bc *ChainManager) setTotalDifficulty(td *big.Int) { } func (bc *ChainManager) Stop() { + if !atomic.CompareAndSwapInt32(&bc.running, 0, 1) { + return + } close(bc.quit) atomic.StoreInt32(&bc.procInterrupt, 1)