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多线程经典问题-----乘客做公交车问题解答3

2013-12-15 20:34 459 查看
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:

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