線程鎖，遞歸鎖

##線程鎖應(yīng)用

import time,threading
python中自己加鎖了所以用不著！
def run(n):
    lock.acquire() #獲取一把鎖
    global  num
    num+=1
    lock.release() #釋放鎖

lock=threading.Lock()
num=0
loot=[] #創(chuàng)建一個(gè)空列表（存線程實(shí)例）
for i in range (50):
    t=threading.Thread(target=run,args=("t-%s"%i,))
    t.start()
    loot.append(t) #為了不阻塞后面的線程啟動(dòng)，不在這里join，先放到一個(gè)列表里

for t in loot:#循環(huán)線程實(shí)例列表，等待所有線程執(zhí)行完畢
    t.join() #等待一個(gè)線程全部執(zhí)行完再執(zhí)行其他線程（把并程改成了串行）
print("-----ddddd-----",threading.current_thread(),threading.active_count())#看是否是主線程，活躍的線程數(shù)量
print("num:",num)

##遞歸鎖的意思是相當(dāng)于已過(guò)字典。。。每開一道門就存門對(duì)應(yīng)的鑰匙數(shù)據(jù)，退出時(shí)去字典找對(duì)應(yīng)的門用的鑰匙

def run1():
    print("grab the first part data")
    lock.acquire()
    global num
    num+=1
    lock.release()
    return num

def run2():
    print("grab the second part data")
    lock.acquire()
    global  num2
    num2+=1
    lock.release()
    return num2

def run3():
    lock.acquire()
    res=run1()
    print("----between run1 and run2-----")
    res2=run2()
    lock.release()
    print(res,res2)

num,num2=0,0
lock=threading.RLock() ##遞歸鎖創(chuàng)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)