add hw2

node_modules/vscode-jsonrpc/lib/common/semaphore.js

@@ -0,0 +1,68 @@
+"use strict";
+/* --------------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ * ------------------------------------------------------------------------------------------ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Semaphore = void 0;
+const ral_1 = require("./ral");
+class Semaphore {
+    constructor(capacity = 1) {
+        if (capacity <= 0) {
+            throw new Error('Capacity must be greater than 0');
+        }
+        this._capacity = capacity;
+        this._active = 0;
+        this._waiting = [];
+    }
+    lock(thunk) {
+        return new Promise((resolve, reject) => {
+            this._waiting.push({ thunk, resolve, reject });
+            this.runNext();
+        });
+    }
+    get active() {
+        return this._active;
+    }
+    runNext() {
+        if (this._waiting.length === 0 || this._active === this._capacity) {
+            return;
+        }
+        (0, ral_1.default)().timer.setImmediate(() => this.doRunNext());
+    }
+    doRunNext() {
+        if (this._waiting.length === 0 || this._active === this._capacity) {
+            return;
+        }
+        const next = this._waiting.shift();
+        this._active++;
+        if (this._active > this._capacity) {
+            throw new Error(`To many thunks active`);
+        }
+        try {
+            const result = next.thunk();
+            if (result instanceof Promise) {
+                result.then((value) => {
+                    this._active--;
+                    next.resolve(value);
+                    this.runNext();
+                }, (err) => {
+                    this._active--;
+                    next.reject(err);
+                    this.runNext();
+                });
+            }
+            else {
+                this._active--;
+                next.resolve(result);
+                this.runNext();
+            }
+        }
+        catch (err) {
+            this._active--;
+            next.reject(err);
+            this.runNext();
+        }
+    }
+}
+exports.Semaphore = Semaphore;