[b0024] python 归纳 (十)_线程 _Thread模块

 

#!/usr/bin/pythonn
# -*- coding: UTF-8 -*-
"""
学习线程  thread
总结:
    1.  主线程退出，所有子线程都退出
    2.  子线程 能直接读取外部变量
    3.  thread.start_new_thread 调用后，立即执行并发代码了，不像有些模块，执行完后，要调用start方法才执行并发代码,xxxx.yyyy().start()

使用:
    调用 thread.start_new_thread( <func>,(parmas,parmas))
    根据上述 第一条 原则，看情况是否在 启动 线程后 ，主线程代码如何处理
"""
import thread
import time
import threading

a = 0  #  不同线程共同操作数据
def print_time(threadname,delay):
    global a
    print "thread %s,%s start" % (threading.currentThread().getName(),threadname)
    count = 0
    while count <3:
        time.sleep(delay)
        count +=1
        a +=1
        print "%d,%s,%s:%s" % (a,threading.currentThread().getName(),threadname,time.ctime(time.time()) )

    print "thread %s,%s end" % (threading.currentThread().getName(),threadname)

print "main:%s  start"  %  threading.currentThread().getName()

try:
    thread.start_new_thread(print_time,("thread1",2,))
    thread.start_new_thread(print_time,("thread2",3,))
except:
    print "Error: unable to start thread"
    pass

time.sleep(7)
print "main:%s  end" %  threading.currentThread().getName()

输出:

主线程等所有子线程跑完
time.sleep(15)

Out:
main:MainThread  start
thread Dummy-1,thread1 start
thread Dummy-2,thread2 start
1,Dummy-1,thread1:Sat Sep 08 02:23:04 2018
2,Dummy-2,thread2:Sat Sep 08 02:23:05 2018
3,Dummy-1,thread1:Sat Sep 08 02:23:06 2018
4,Dummy-2,thread2:Sat Sep 08 02:23:08 2018
5,Dummy-1,thread1:Sat Sep 08 02:23:08 2018
thread Dummy-1,thread1 end
6,Dummy-2,thread2:Sat Sep 08 02:23:11 2018
thread Dummy-2,thread2 end
main:MainThread  end

---------------------------------------------------
主线程没有等子线程跑完 ，自己先跑完
time.sleep(7)
Out:
main:MainThread  start
thread Dummy-1,thread1 start
thread Dummy-2,thread2 start
1,Dummy-1,thread1:Sat Sep 08 02:25:29 2018
2,Dummy-2,thread2:Sat Sep 08 02:25:30 2018
3,Dummy-1,thread1:Sat Sep 08 02:25:31 2018
4,Dummy-1,thread1:Sat Sep 08 02:25:33 2018
thread Dummy-1,thread1 end
5,Dummy-2,thread2:Sat Sep 08 02:25:33 2018

main:MainThread  end