add lock

Author: gzezFISHER

src/methods/lock.js

@@ -0,0 +1,28 @@
+const Lock = () => {
+  return {
+    lockQueue: new Array(),
+    locked: false
+  }
+}
+
+const acquire = async (lock) => {
+  if (lock.locked) {
+    let that = lock;
+    await new Promise((resolve) => {
+      that.lockQueue.push(resolve);
+    });
+  }
+  lock.locked = true;
+  return true;
+};
+
+
+const release = (lock) => {
+  lock.locked = false;
+  const resolve = lock.lockQueue.pop();
+  if (resolve) {
+    resolve();
+  }
+}
+
+export {Lock, acquire, release};