A mutex (mutual exclusion) is a synchronization primitive that grants exclusive access to a shared resource.

This is a low-level primitive. Use Lock instead of Mutex if you need to access a shared value concurrently.

import { AsyncValue } from "./testutil.ts";
import { Mutex } from "./mutex.ts";

const count = new AsyncValue(0);

async function doSomething() {
  const v = await count.get();
  await count.set(v + 1);
}

// Critical section
const mu = new Mutex();
await mu.acquire();
try {
  await doSomething();
} finally {
  mu.release();
}