Python3.x 如何创建一个永远在其上运行滚动协程的事件循环

为了防止上下文切换，我想创建一个大循环来服务于网络连接和一些 routine .

以下是正常功能的实现:

import asyncio
import time


def hello_world(loop):
    print('Hello World')
    loop.call_later(1, hello_world, loop)

def good_evening(loop):
    print('Good Evening')
    loop.call_later(1, good_evening, loop)

print('step: asyncio.get_event_loop()')
loop = asyncio.get_event_loop()

print('step: loop.call_soon(hello_world, loop)')
loop.call_soon(hello_world, loop)
print('step: loop.call_soon(good_evening, loop)')
loop.call_soon(good_evening, loop)

try:
    # Blocking call interrupted by loop.stop()
    print('step: loop.run_forever()')
    loop.run_forever()
except KeyboardInterrupt:
    pass
finally:
    print('step: loop.close()')
    loop.close()

以下是协同程序的实现:

import asyncio


@asyncio.coroutine
def hello_world():
    while True:
        yield from asyncio.sleep(1)
        print('Hello World')

@asyncio.coroutine
def good_evening():
    while True:
        yield from asyncio.sleep(1)
        print('Good Evening')

print('step: asyncio.get_event_loop()')
loop = asyncio.get_event_loop()
try:
    print('step: loop.run_until_complete()')
    loop.run_until_complete(asyncio.wait([
        hello_world(),
        good_evening()
    ]))
except KeyboardInterrupt:
    pass
finally:
    print('step: loop.close()')
    loop.close()

混合的一个:

import asyncio
import time


def hello_world(loop):
    print('Hello World')
    loop.call_later(1, hello_world, loop)

def good_evening(loop):
    print('Good Evening')
    loop.call_later(1, good_evening, loop)

@asyncio.coroutine
def hello_world_coroutine():
    while True:
        yield from asyncio.sleep(1)
        print('Hello World Coroutine')

@asyncio.coroutine
def good_evening_coroutine():
    while True:
        yield from asyncio.sleep(1)
        print('Good Evening Coroutine')

print('step: asyncio.get_event_loop()')
loop = asyncio.get_event_loop()

print('step: loop.call_soon(hello_world, loop)')
loop.call_soon(hello_world, loop)
print('step: loop.call_soon(good_evening, loop)')
loop.call_soon(good_evening, loop)
print('step: asyncio.async(hello_world_coroutine)')
asyncio.async(hello_world_coroutine())
print('step: asyncio.async(good_evening_coroutine)')
asyncio.async(good_evening_coroutine())

try:
    loop.run_forever()
except KeyboardInterrupt:
    pass
finally:
    print('step: loop.close()')
    loop.close()

如您所见，每个协程函数都有一个while循环.我怎样才能让它像正常的一样？也就是说，当它完成时，在给定的延迟时间后调用自己，但不只是在那里放一个循环.