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dancingtest.py
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156 lines (140 loc) · 3.96 KB
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#!usr/bin/python
from threading import Thread, Semaphore
from collections import deque
import sys
import random
import time
import itertools
#global variables
rng = random.Random()
rng.seed(100)
numLeaders = 0
numFollowers = 0
leaderq = deque()
followerq = deque()
#sempahore
followerwait = Semaphore(0)
leaderwait = Semaphore(0)
floormutex = Semaphore(1)
printmutex = Semaphore(1)
turnstile = Semaphore(1)
followerenter = Semaphore(0)
class LightSwitch:
def __init__(self):
self.counter = 0
self.mutex = Semaphore(1)
def lock(self, semaphore):
self.mutex.acquire()
self.counter += 1
if self.counter == 1:
semaphore.acquire()
self.mutex.release()
def unlock(self, semaphore):
self.mutex.acquire()
self.counter -= 1
#print str(self.counter)
if self.counter == 0:
semaphore.release()
self.mutex.release()
FloorLightSwitch = LightSwitch()
def start_music(music):
global printmutex
printmutex.acquire()
print'** Band leader started playing '+music+' **'
printmutex.release()
def end_music(music):
printmutex.acquire()
print'** Band leader stopped playing '+music+' **'
printmutex.release()
def band_leader():
global floormutex
global turnstile
for music in itertools.cycle(['waltz','tango','foxtrot']):
start_music(music)
time.sleep(1)
turnstile.acquire()
floormutex.acquire()
end_music(music)
turnstile.release()
floormutex.release()
def enter_floor(type,number):
global floormutex
global followerenter
time.sleep(rng.random())
if(type == 'L'):
printmutex.acquire()
print 'Leader '+str(number)+' entered floor'
printmutex.release()
if(type == 'F'):
printmutex.acquire()
print 'Follower '+str(number)+' entered floor'
printmutex.release()
followerenter[number].release()
def dance(type,number):
global followerenter
if(type == 'L'):
#deque.appendleft(id)
temp = followerq.pop()
followerenter[temp].acquire()
printmutex.acquire()
print 'Leader '+str(number)+ ' and Follower '+str(temp)+ ' are dancing. '
printmutex.release()
time.sleep(rng.random())
if(type =='F'):
time.sleep(rng.random())
def line_up(type,number):
if(type == 'L'):
printmutex.acquire()
print 'Leader '+str(number)+' getting back in line.'
printmutex.release()
if(type == 'F'):
printmutex.acquire()
print 'Follower '+str(number)+' getting back in line.'
printmutex.release()
try:
numLeaders = int(sys.argv[1])
numFollowers = int(sys.argv[2])
global followerenter
followerenter = [Semaphore(0) for i in range(numFollowers)]
except:
print('Usage dancers <numberofleaders> <numberoffollowers>')
exit()
def leader(id):
global FloorLightSwitch
global floormutex
global followerwait
global leaderwait
while True:
leaderwait.release()
followerwait.acquire()
turnstile.acquire()
turnstile.release()
FloorLightSwitch.lock(floormutex)
enter_floor('L',id)
dance('L',id)
line_up('L',id)
FloorLightSwitch.unlock(floormutex)
def follower(id):
global FloorLightSwitch
global floormutex
global followerwait
global leaderwait
while True:
followerq.appendleft(id)
followerwait.release()
leaderwait.acquire()
turnstile.acquire()
turnstile.release()
FloorLightSwitch.lock(floormutex)
enter_floor('F',id)
dance('F',id)
line_up('F',id)
FloorLightSwitch.unlock(floormutex)
tbandleader = Thread(target=band_leader)
tbandleader.start()
for i in range(0,numLeaders):
tleader = Thread(target=leader,args=[i])
tleader.start()
for j in range(0,numFollowers):
tfollower = Thread(target=follower,args=[j])
tfollower.start()