##線程鎖應用
import time,threading
python中自己加鎖了所以用不着!
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=[] #創建一個空列表(存線程實例)
for i in range (50):
t=threading.Thread(target=run,args=("t-%s"%i,))
t.start()
loot.append(t) #爲了不阻塞後面的線程啓動,不在這裏join,先放到一個列表裏
for t in loot:#循環線程實例列表,等待所有線程執行完畢
t.join() #等待一個線程全部執行完再執行其他線程(把並程改成了串行)
print("-----ddddd-----",threading.current_thread(),threading.active_count())#看是否是主線程,活躍的線程數量
print("num:",num)
##遞歸鎖的意思是相當於已過字典。。。每開一道門就存門對應的鑰匙數據,退出時去字典找對應的門用的鑰匙
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)