为了防止上下文切换,我想创建一个大循环来同时服务于网络连接和一些例行程序。
以下是正常函数的实现:
以下是正常函数的实现:
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()
这是协程的实现方式:
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()
还有混合的一种:
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包围着的while循环。我该如何使它像普通的函数一样?即当完成后,在给定的延迟时间后调用自身,而不仅是在那里设置一个循环。