Python线程障碍对象Barrier原理详解

# 导入线程模块
import threading
# 障碍对象barrier
barrier = threading.Barrier(parties, action=None, timeout=None)

# !usr/bin/env python
# -*- coding:utf-8 _*-
"""
@Author:何以解忧
@Blog(个人博客地址): shuopython.com
@WeChat Official Account(微信公众号)：猿说python
@Github:www.github.com
 
@File:python_arbrier.py
@Time:2019/10/31 21:25
 
@Motto:不积跬步无以至千里，不积小流无以成江海，程序人生的精彩需要坚持不懈地积累！
"""
 
# 导入线程模块
import threading
 
def plyer_display():
  print('初始化通过完成，音视频同步完成，可以开始播放....')
 
# 设置3个障碍对象
barrier = threading.Barrier(3, action=plyer_display, timeout=None)
 
 
def player_init(statu):
  print(statu)
  try:
    # 设置超时时间，如果2秒内，没有达到障碍线程数量，
    # 会进入断开状态，引发BrokenBarrierError错误
    barrier.wait(2)
  except Exception as e: # 断开状态，引发BrokenBarrierError错误
    print("等待超时了... ")
  else:
    print("xxxooooxxxxxooooxxxoooo")
if __name__ == '__main__':
  
  statu_list = ["init ready","video ready","audio ready"]
  thread_list = list()
  for i in range(0,3):
    t = threading.Thread(target=player_init,args=(statu_list[i],))
    t.start()
    thread_list.append(t)
 
  for t in thread_list:
    t.join()

init ready
video ready
audio ready
初始化通过完成，音视频同步完成，可以开始播放....
xxxooooxxxxxooooxxxoooo
xxxooooxxxxxooooxxxoooo
xxxooooxxxxxooooxxxoooo

# 导入线程模块
import threading
 
def plyer_display():
  print('初始化通过完成，音视频同步完成，可以开始播放....')
 
# 设置3个障碍对象
barrier = threading.Barrier(3, action=plyer_display, timeout=None)
 
def player_init(statu):
 
  while True:
    print(statu)
    try:
      # 设置超时时间，如果2秒内，没有达到障碍线程数量，
      # 会进入断开状态，引发BrokenBarrierError错误
      barrier.wait(2)
    except Exception as e: # 断开状态，引发BrokenBarrierError错误
      # print("断开状态... ")
      continue
    else:
      print("xxxooyyyxxxooyyyxxxooyyy")
      break
 
if __name__ == '__main__':
 
  statu_list = ["init ready","video ready","audio ready"]
  thread_list = list()
  for i in range(0,3):
    t = threading.Thread(target=player_init,args=(statu_list[i],))
    t.start()
    
    thread_list.append(t)
    if i == 1: # 重置状态
      print("不想看爱情片，我要看爱情动作片....")
      barrier.reset()
  for t in thread_list:
    t.join()

init ready
video ready
不想看爱情片，我要看爱情动作片....
init ready
video ready
audio ready
初始化通过完成，音视频同步完成，可以开始播放....
xxxooyyyxxxooyyyxxxooyyy
xxxooyyyxxxooyyyxxxooyyy
xxxooyyyxxxooyyyxxxooyyy