【python3】多线程-线程同步

1. 认识线程同步现象：

在https://blog.csdn.net/weixin_41827162/article/details/84104421线程异步中，

将方法1中：

建多个线程，同时执行多个线程，由新到旧逐个释放线程

改成：

创建一个线程，执行一个线程，释放一个线程

#!/usr/bin/python3
# 线程异步
 
import threading
import time
 
exitFlag = 0
 
 
class myThread(threading.Thread):
    def __init__(self, thread_id, name, counter):
        threading.Thread.__init__(self)
        self.thread_id = thread_id
        self.name = name
        self.counter = counter
        pass
 
    def run(self):
        print("开始线程=" + self.name)
        run_def(self.name, self.counter, 5)
        print("退出线程=" + self.name)
        pass
    pass
 
 
def run_def(thread_name, delay, counter):
    while counter:
        if exitFlag:
            thread_name.exit()
            pass
        time.sleep(delay)
        # time.sleep(0)
        list(thread_name)
        counter -= 1
        pass
    pass
 
 
def list(thread_name):
    print("\n执行线程=" + thread_name)
    pass
 
 
threads = []  # 存储在线线程
 
# 创建线程
for this_t in range(1, 10):
    t = myThread(this_t, "Thread-" + str(this_t), 0.1)
    t.start()
    t.join()  # 线程同步，线程异步
    threads.append(t)
    pass
 
# 终止线程
# for t in threads:
#     t.join()
#     pass
 
print("程序完成！！")

2. 真正的线程同步：

#!/usr/bin/python3

# 线程同步

import threading
import time


class myThread(threading.Thread):
    def __init__(self, threadID, name, counter):
        threading.Thread.__init__(self)
        self.threadID = threadID
        self.name = name
        self.counter = counter

    def run(self):
        print("开启线程： " + self.name)
        # 获取锁，用于线程同步
        threadLock.acquire()
        print_time(self.name, self.counter, 3)
        # 释放锁，开启下一个线程
        threadLock.release()


def print_time(threadName, delay, counter):
    while counter:
        time.sleep(0)
        print("%s: %s" % (threadName, time.ctime(time.time())))
        counter -= 1


threadLock = threading.Lock()
threads = []


for cal in range(1, 100):
    that = myThread(cal, "Thread-" + str(cal), cal).start()
    print("创建了线程=" + str(cal))
    threads.append(that)
    pass

print("退出主线程")

【python3】多线程-线程同步

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