From c9b7a2a4b7900d8ac9431bc5e98c8ac7d59a43d1 Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Fri, 8 Sep 2017 19:26:46 +0200
Subject: [PATCH] ethdb: use RLock for Has

---
 ethdb/memory_database.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ethdb/memory_database.go b/ethdb/memory_database.go
index 916f88e6e1..699bd0c9fd 100644
--- a/ethdb/memory_database.go
+++ b/ethdb/memory_database.go
@@ -46,8 +46,8 @@ func (db *MemDatabase) Put(key []byte, value []byte) error {
 }
 
 func (db *MemDatabase) Has(key []byte) (bool, error) {
-	db.lock.Lock()
-	defer db.lock.Unlock()
+	db.lock.RLock()
+	defer db.lock.RUnlock()
 
 	_, ok := db.db[string(key)]
 	return ok, nil