async_experiment_3.py

import asyncio
import time

import trio

import pyinstrument


def do_nothing():
    pass


def busy_wait(duration):
    end_time = time.time() + duration

    while time.time() < end_time:
        do_nothing()


async def say(what, when, profile=False):
    if profile:
        p = pyinstrument.Profiler()
        p.start()
    else:
        p = None

    busy_wait(0.1)
    sleep_start = time.time()
    await trio.sleep(when)
    print(f"slept for {time.time() - sleep_start:.3f} seconds")
    busy_wait(0.1)

    print(what)
    if p:
        p.stop()
        p.print(show_all=True)


async def task():
    async with trio.open_nursery() as nursery:
        nursery.start_soon(say, "first hello", 2, True)
        nursery.start_soon(say, "second hello", 1, True)
        nursery.start_soon(say, "third hello", 3, True)


trio.run(task)