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state: take write lock in GetNonce (#3625) 

We must take a write lock here because `GetNonce` calls
`StateDB.GetStateObject`, which mutates the DB's live set.
This commit is contained in:
Brian Schroeder 2017-02-01 04:55:46 -05:00 committed by Jeffrey Wilcke
parent 4f5f90222f
commit 296450451b
1 changed files with 5 additions and 3 deletions
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8
core/state/managed_state.go
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@ -82,10 +82,12 @@ func (ms *ManagedState) NewNonce(addr common.Address) uint64 {
return uint64(len(account.nonces)-1) + account.nstart
}
// GetNonce returns the canonical nonce for the managed or unmanaged account
// GetNonce returns the canonical nonce for the managed or unmanaged account.
//
// Because GetNonce mutates the DB, we must take a write lock.
func (ms *ManagedState) GetNonce(addr common.Address) uint64 {
ms.mu.RLock()
defer ms.mu.RUnlock()
ms.mu.Lock()
defer ms.mu.Unlock()
if ms.hasAccount(addr) {
account := ms.getAccount(addr)