asyncio_loop.py

# coding: utf-8
import asyncio
import datetime
import logging
import time
logger = logging.getLogger(__name__)
logger.addHandler(logging.StreamHandler())
logger.setLevel(logging.DEBUG)


def main_loop(on_update, fps=60):
    #asyncio.set_event_loop(asyncio.ProactorEventLoop())
    loop = asyncio.get_event_loop()

    async def loop_func():
        frame_par_seconds=1.0/fps
        frame_count=0
        last_frame_second=int(loop.time())

        while True:
            start_time=loop.time()
            end_time =  start_time + frame_par_seconds
            frame_count+=1
            frame_second=int(start_time)
            if frame_second!=last_frame_second:
                logger.debug("%d frames/sec", frame_count)
                frame_count=0
                last_frame_second=frame_second

            on_update()

            await asyncio.sleep(frame_par_seconds - (loop.time()-start_time))

    loop.run_until_complete(loop_func())
    loop.close()

def on_update():
    time.sleep(0.014)
    pass

main_loop(on_update, fps=60)