Python多线程经典问题之乘客做公交车算法实例

本文实例讲述了Python多线程经典问题之乘客做公交车算法。分享给大家供大家参考，具体如下：

问题描述：

乘客乘坐公交车问题，司机，乘客，售票员协同工作,通过多线程模拟三者的工作。
司机：开车，停车
售票员：打开车门，关闭车门
乘客：上车，下车

用Python的Event做线程同步通信，代码如下：

# *-* coding:gb2312 *-*
import threading
import time
stationName=("车站0","车站1","车站2","车站3","车站4","车站5","车站6")
currentStationIndex = -1
eventBusStop = threading.Event()
eventClosedDoor = threading.Event()
eventOpenedDoor = threading.Event()
stationCount = len(stationName)
class Passenger(threading.Thread):
  def __init__(self,no,getonStation,getoffStation):
    self.no =no
    self.getonStation=getonStation
    self.getoffStation=getoffStation
    threading.Thread.__init__(self)
  def run(self):
    bExit= False
    global currentStationIndex
    global stationCount
    bAlreadyGetOnStation = False
    while not bExit:
      eventOpenedDoor.wait()
      if self.getonStation == currentStationIndex and bAlreadyGetOnStation == False:
        print "乘客%d在%s上车" %(self.no,stationName[currentStationIndex])
        bAlreadyGetOnStation =True
      elif self.getoffStation == currentStationIndex:
        print "乘客%d在%s下车" %(self.no,stationName[currentStationIndex])
        bExit = True
      time.sleep(1)
class Driver(threading.Thread):
  def run(self):
    bExit= False
    global currentStationIndex
    global stationCount
    while not bExit:
      print "司机: 公交车开始行驶....."
      time.sleep(5)
      currentStationIndex += 1
      print "司机: 到站 ",stationName[currentStationIndex]
      eventBusStop.set()
      eventClosedDoor.wait()
      eventClosedDoor.clear()
      if currentStationIndex == stationCount-1:
        bExit= True
class Conductor(threading.Thread):
  def run(self):
    bExit= False
    global currentStationIndex
    global stationCount
    while not bExit:
      eventBusStop.wait()
      eventBusStop.clear()
      print "售票员打开车门：%s到了" %(stationName[currentStationIndex])
      eventOpenedDoor.set()
      time.sleep(5)
      print "售票员关闭车门"
      eventOpenedDoor.clear()
      eventClosedDoor.set()
      if currentStationIndex == stationCount-1:
        bExit = True
def test():
  passPool=[]
  passPool.append(Passenger(0,0,3))
  passPool.append(Passenger(1,1,3))
  passPool.append(Passenger(2,2,4))
  passPool.append(Passenger(3,0,5))
  passPool.append(Passenger(4,1,3))
  passPool.append(Passenger(5,2,4))
  passPool.append(Passenger(6,4,5))
  passPool.append(Passenger(7,0,2))
  passPool.append(Passenger(8,1,3))
  passPool.append(Conductor())
  passPool.append(Driver())
  leng = len(passPool)
  for i in range(leng):
    passPool[i].start()
if __name__=='__main__':
  test()

输出结果如下：

希望本文所述对大家Python程序设计有所帮助。

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