merged system layer support

cmd/dkl-local-server/mutex.go

@@ -0,0 +1,28 @@
+package main
+
+import "sync"
+
+var (
+	opMutexes = map[string]*sync.Mutex{}
+	opsLock   sync.Mutex
+)
+
+func opMutex[T any](key string, op func() (T, error)) (T, error) {
+	lock := func() *sync.Mutex {
+		opsLock.Lock()
+		defer opsLock.Unlock()
+
+		lock, ok := opMutexes[key]
+		if !ok {
+			lock = new(sync.Mutex)
+			opMutexes[key] = lock
+		}
+
+		return lock
+	}()
+
+	lock.Lock()
+	defer lock.Unlock()
+
+	return op()
+}