[Python_5] Python 线程

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0. 说明

　　Python 线程笔记

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1. 低级 API

# -*-coding:utf-8-*-
"""
    线程
"""

"""
    低级 API
"""
import time
import _thread

def sayHello(str):
    print(str)

try:
    _thread.start_new_thread(sayHello, ("hello world",))
finally:
    # 休眠的秒数
    time.sleep(5)

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2. 高级 API

　　玩家线程

"""
    高级 API
"""

import threading

# 玩家类
class Player(threading.Thread):
    def run(self):
        print("%s 出发了" % (self.name))
        time.sleep(self.time)
        print("%s 到了" % (self.name))

    def __init__(self, name, time):
        threading.Thread.__init__(self)
        self.name = name
        self.time = time

p1 = Player("p1", 3)
p2 = Player("p2", 1)
p3 = Player("p3", 2)
p4 = Player("p4", 4)

p1.start()
p2.start()
p3.start()
p4.start()

p1.join()
p2.join()
p3.join()
p4.join()
print("开局!!")

　　售票问题解决多线程安全问题

import threading

tickets = 100

# 取票方法,保证线程安全性
lock = threading.Lock()

def getTicket():
    global tickets
    lock.acquire()
    tmp = tickets
    if (tickets > 0):
        tickets -= 1
        lock.release()
        return tmp
    else:
        lock.release()
        return -1

# 售票员
class Saler(threading.Thread):
    def run(self):
        while (True):
            tmp = getTicket()
            if tmp != -1:
                print("%s : %d\r\n" % (self.name, tmp), end="")
            else:
                break;

    def __init__(self, name):
        threading.Thread.__init__(self)
        self.name = name

s2 = Saler("s2")
s1 = Saler("s1")
s1.start()
s2.start()
s1.join()
s2.join()

print("over")

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