python threading线程同步的实现方法

#Python 多线程示例来演示锁定。
#1. 使用 threading.Thread 类定义子类。
#2. 实例化子类并触发线程。
#3. 在线程的 run 方法中实现锁。
 
import threading
import datetime
 
exitFlag = 0
 
class myThread (threading.Thread):
    def __init__(self, name, counter):
        threading.Thread.__init__(self)
        self.threadID = counter
        self.name = name
        self.counter = counter
    def run(self):
        print("\nStarting " + self.name)
        # 获取锁同步线程
        threadLock.acquire()
        print_date(self.name, self.counter)
        # 为下一个线程释放锁
        threadLock.release()
        print("Exiting " + self.name)
 
def print_date(threadName, counter):
    datefields = []
    today = datetime.date.today()
    datefields.append(today)
    print("{}[{}]: {}".format( threadName, counter, datefields[0] ))
 
threadLock = threading.Lock()
threads = []
 
# 创建新线程
thread1 = myThread("Thread", 1)
thread2 = myThread("Thread", 2)
 
# 启动新线程
thread1.start()
thread2.start()
 
# 添加线程到线程列表
threads.append(thread1)
threads.append(thread2)
 
# 等待所有线程完成
for thread in threads:
    thread.join()
 
print("\nExiting the Program!!!")