##线程锁应用

import time,threadingpython中自己加锁了所以用不着！def run(n): lock.acquire() #获取一把锁 global num num+=1 lock.release() #释放锁lock=threading.Lock()num=0loot=[] #创建一个空列表（存线程实例）for i in range (50): t=threading.Thread(target=run,args=("t-%s"%i,)) t.start() loot.append(t) #为了不阻塞后面的线程启动，不在这里join，先放到一个列表里for t in loot:#循环线程实例列表，等待所有线程执行完毕 t.join() #等待一个线程全部执行完再执行其他线程（把并程改成了串行）print("-----ddddd-----",threading.current_thread(),threading.active_count())#看是否是主线程，活跃的线程数量print("num:",num)

##递归锁的意思是相当于已过字典。。。每开一道门就存门对应的钥匙数据，退出时去字典找对应的门用的钥匙

def run1(): print("grab the first part data") lock.acquire() global num num+=1 lock.release() return numdef run2(): print("grab the second part data") lock.acquire() global num2 num2+=1 lock.release() return num2def run3(): lock.acquire() res=run1() print("----between run1 and run2-----") res2=run2() lock.release() print(res,res2)num,num2=0,0lock=threading.RLock() ##递归锁创建for i in range(10): t=threading.Thread(target=run3) t.start()while threading.active_count()!=1: print(threading.active_count())else: print("------all threads done------") print(num,num2)