python如何使用事件对象asyncio.Event来同步协程

import asyncio
import functools
 
def set_event(event):
  print('setting event in callback')
  event.set()
 
async def coro1(event):
  print('coro1 waiting for event')
  await event.wait()
  print('coro1 triggered')
 
async def coro2(event):
  print('coro2 waiting for event')
  await event.wait()
  print('coro2 triggered')
 
async def main(loop):
  # Create a shared event
  event = asyncio.Event()
  print('event start state: {}'.format(event.is_set()))
 
  loop.call_later(
    0.1, functools.partial(set_event, event)
  )
 
  await asyncio.wait([coro1(event), coro2(event)])
  print('event end state: {}'.format(event.is_set()))
 
event_loop = asyncio.get_event_loop()
try:
  event_loop.run_until_complete(main(event_loop))
finally:
  event_loop.close()

event start state: False
coro2 waiting for event
coro1 waiting for event
setting event in callback
coro2 triggered
coro1 triggered
event end state: True

import asyncio
import functools
import logging
import sys
 
MESSAGES = [
  b'This is the message. ',
  b'It will be sent ',
  b'in parts.',
]
SERVER_ADDRESS = ('localhost', 10000)
 
class EchoClient(asyncio.Protocol):
 
  def __init__(self, messages, future):
    super().__init__()
    self.messages = messages
    self.log = logging.getLogger('EchoClient')
    self.f = future
 
  def connection_made(self, transport):
    self.transport = transport
    self.address = transport.get_extra_info('peername')
    self.log.debug(
      'connecting to {} port {}'.format(*self.address)
    )
    # This could be transport.writelines() except that
    # would make it harder to show each part of the message
    # being sent.
    for msg in self.messages:
      transport.write(msg)
      self.log.debug('sending {!r}'.format(msg))
    if transport.can_write_eof():
      transport.write_eof()
 
  def data_received(self, data):
    self.log.debug('received {!r}'.format(data))
 
  def eof_received(self):
    self.log.debug('received EOF')
    self.transport.close()
    if not self.f.done():
      self.f.set_result(True)
 
  def connection_lost(self, exc):
    self.log.debug('server closed connection')
    self.transport.close()
    if not self.f.done():
      self.f.set_result(True)
    super().connection_lost(exc)
 
logging.basicConfig(
  level=logging.DEBUG,
  format='%(name)s: %(message)s',
  stream=sys.stderr,
)
log = logging.getLogger('main')
 
event_loop = asyncio.get_event_loop()
 
client_completed = asyncio.Future()
 
client_factory = functools.partial(
  EchoClient,
  messages=MESSAGES,
  future=client_completed,
)
factory_coroutine = event_loop.create_connection(
  client_factory,
  *SERVER_ADDRESS,
)
 
log.debug('waiting for client to complete')
try:
  event_loop.run_until_complete(factory_coroutine)
  event_loop.run_until_complete(client_completed)
finally:
  log.debug('closing event loop')
  event_loop.close()