coroutine waiter library

This library provide a map associated blocking primitive that waiting for a response produced by another coroutine

Usage

• the map associated interface is through WaiterMap ```rust fn testwaitermap() { let reqmap = Arc::new(WaiterMap::::new()); let rmap = reqmap.clone();

  let key = 1234;

  // one coroutine wait data send from another coroutine // prepare the waiter first let waiter = reqmap.newwaiter(key);

  // trigger the rsp in another coroutine go!(move || rmap.set_rsp(&key, 100).ok());

  // this will block until the rsp was set let result = waiter.waitrsp(None).unwrap(); asserteq!(result, 100); } ```