jscoding/lib/lock.js

A envirement for coding and debugging javascript language.

class Lock {
    constructor() {
        this.queue = [];
        this.locked = false;
    }

    async lock() {
        if (this.locked) {
            let that = this;
            await new Promise((resolve) => {
                that.queue.push(resolve);
            });
        }
        this.locked = true;
        return true;
    }

    unlock() {
        this.locked = false;
        let resolve = this.queue.pop();
        if (resolve) {
            resolve();
        }
    }
}