Function withLock

test/unit/mcpServer_test.js:265–276

(fn)

      let lock = Promise.resolve()

      async function withLock(fn) {
        const prev = lock
        let release
        lock = new Promise(r => (release = r))

        await prev
        try {
          return await fn()
        } finally {
          release()
        }
      }

      const task1 = withLock(async () => {
        executionOrder.push('start1')