python-day33--互斥锁

锁的意思就是：一个一个的执行

from multiprocessing import Process,Lock
import os
import time
def work(mutex):
    mutex.acquire()
    print('task[%s] 上厕所' %os.getpid())
    time.sleep(3)
    print('task[%s] 上完厕所' %os.getpid())
    mutex.release()

if __name__ == '__main__':
    mutex=Lock()
    p1=Process(target=work,args=(mutex,))
    p2=Process(target=work,args=(mutex,))
    p3=Process(target=work,args=(mutex,))
    p1.start()
    p2.start()
    p3.start()

    print('主')

from multiprocessing import Process,Lock
import json
import time
import random
import os
def search():
    dic=json.load(open('a',))
    print('剩余票数%s' %dic['count'])

def get_ticket():
    dic=json.load(open('a',))
    if dic['count'] > 0:
        dic['count']-=1
        json.dump(dic,open('a','w'))
        print('%s 购票成功' %os.getpid())
def task(mutex):
    search()
    time.sleep(random.randint(1, 3)) #模拟购票一系列繁琐的过程所花费的时间
    mutex.acquire()
    get_ticket()
    mutex.release()
if __name__ == '__main__':
    mutex=Lock()
    for i in range(50):
        p=Process(target=task,args=(mutex,))
        p.start()