Class IMQLock

import { IMQLock, AcquiredLock } from '.';

async function doSomething(): Promise<number | AcquiredLock<number>> {
    const lock: AcquiredLock<number> = await IMQLock.acquire<number>('doSomething');

    if (IMQLock.locked('doSomething')) {
        // avoiding err handling in this way can cause ded-locks
        // so it is good always try catch locked calls!
        // BTW, IMQLock uses timeouts to avoid dead-locks
        try {
            // this code will be called only once per multiple async calls
            // so all promises will be resolved with the same value
            const res = Math.random();
            IMQLock.release('doSomething', res);
            return res;
        }

        catch (err) {
             // release acquired locks with error
            IMQLock.release('doSomething', null, err);
            throw err;
        }
    }

    return lock;
}

(async () => {
    for (let i = 0; i < 10; ++i) {
        // run doSomething() asynchronously 10 times
        doSomething().then((res) => console.log(res));
    }
})();