1 files changed, 37 insertions, 0 deletions

diff --git a/shards.go b/shards.go
index ef9f9ef..591e121 100644
--- a/shards.go
+++ b/shards.go
@@ -92,4 +92,41 @@ func ( db *RedisDB) ExecuteReadAll(fn func([]*Shard) interface{})interface{}{
 	}()
 
 	return fn(db.shards)
+}
+
+func ( db *RedisDB) Lock(keys []string){
+		if len(keys) == 1{
+		shard := db.getShard(keys[0])
+		shard.mu.Lock()
+	}else{
+		shardMap := make(map[int]*Shard)
+		for _, k := range keys {
+			shard := db.getShard(k)
+			shardMap[shard.id] = shard
+		}
+		var sortedIDs []int
+		for id := range shardMap {
+			sortedIDs = append(sortedIDs, id)
+		}
+		sort.Ints(sortedIDs)
+		for _, id := range sortedIDs{
+			shardMap[id].mu.Lock()
+		}
+	}
+}
+func ( db *RedisDB) Unlock(keys []string){
+	shardMap := make(map[int]*Shard)
+	for _, k := range keys {
+		shard := db.getShard(k)
+		shardMap[shard.id] = shard
+	}
+	var sortedIDs []int
+	for id := range shardMap {
+		sortedIDs = append(sortedIDs, id)
+	}
+	sort.Ints(sortedIDs)
+
+	for i := len(sortedIDs)-1; i >= 0; i --{
+		shardMap[sortedIDs[i]].mu.Unlock()
+	}
 }
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