@d3vtool/mutex/dist/cjs/mutex.js

This library allows you to use concept of mutex for shared in-memory resource in asynchronous environment.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Mutex = void 0;
const queue_1 = require("./queue");
class Mutex {
    constructor() {
        this.isLocked = false;
        this.queue = new queue_1.Queue();
    }
    async acquire() {
        const lockPromise = new Promise((resolve, _) => {
            const tryToAcquireLock = async () => {
                if (!this.isLocked) {
                    this.isLocked = true;
                    resolve(() => this.unlock());
                }
                else {
                    this.queue.enqueue(tryToAcquireLock);
                }
            };
            tryToAcquireLock();
        });
        return lockPromise;
    }
    async unlock() {
        this.isLocked = false;
        if (!this.queue.isEmpty()) {
            const next = this.queue.dequeue();
            await next();
        }
    }
}
exports.Mutex = Mutex;