gitlab-ci-local/src/mutex.js

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export class Mutex {
    static locks = new Set();
    static async waitForLock(key) {
        return new Promise((resolve) => {
            const intervalKey = setInterval(() => {
                if (!Mutex.locks.has(key)) {
                    clearInterval(intervalKey);
                    return resolve();
                }
            }, 10);
        });
    }
    static async exclusive(key, cb) {
        await Mutex.waitForLock(key);
        Mutex.locks.add(key);
        await cb();
        Mutex.locks.delete(key);
    }
}
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