channel-ts/lib/mutex.js

Channels implemented in Typescript using async/await

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Guard = exports.Mutex = void 0;
class Mutex {
    constructor() {
        this.resolveList = [];
        this.locked = [false];
    }
    acquire() {
        return new Promise((resolve) => {
            if (!this.locked[0]) {
                this.locked[0] = true;
                // eslint-disable-next-line @typescript-eslint/no-use-before-define
                const guard = new Guard(this.resolveList, this.locked);
                resolve(guard);
            }
            else {
                this.resolveList.push(resolve);
            }
        });
    }
}
exports.Mutex = Mutex;
class Guard {
    constructor(lockList, locked) {
        this.resolveList = lockList;
        this.locked = locked;
    }
    release() {
        const resolve = this.resolveList.shift();
        if (resolve) {
            resolve(this);
        }
        else {
            this.locked[0] = false;
        }
    }
}
exports.Guard = Guard;