function range(n: number): number[] {
  return Array.from({ length: n }, (_, i) => i);
}

async function sleep(ms: number): Promise<void> {
  await new Promise((r) => setTimeout(r, ms));
}

let taskId = 0;

async function createTask(): Promise<number> {
  const id = taskId++;
  console.log(`${id}: inside lock`);
  const resp = (await fetch(`http://localhost:8000/proc/${id}`)).status;
  console.log(`${id}: wait`);
  await sleep(100);
  console.log(`${id}: done`);
  return resp;
}

async function main() {
  const lock = new Semaphore(2);
  const promises = range(7).map((i) => {
    console.log(`${i}: enqueue`);
    return lock.run(createTask);
  });
  const results = await Promise.all(promises);
  console.log(results);
}

await main();