Python--day41--递归锁Rlock

1,递归锁Rlock：递归锁是为了解决死锁问题，且递归锁的特点是在同一个线程中可以被acquire()多次

多个acquire()在递归锁中不会阻塞，而互斥锁Lock就会阻塞

代码示例：

1 from threading import RLock
2 
3 rlock = RLock()
4 #多个acquire()在递归锁中不会阻塞，而线程锁Lock就会阻塞
5 rlock.acquire()
6 rlock.acquire()
7 rlock.acquire()
8 rlock.acquire()
9 print(123)

运行结果：

2，递归锁图示：（本质上为一串钥匙）

3，递归锁解决科学家吃面问题：

 1 import time
 2 from threading import RLock, Thread
 3 
 4 noodle_lock = fork_lock = RLock()       #一个钥匙串上的两把钥匙
 5 
 6 def eat1(name):
 7     noodle_lock.acquire()       #一把钥匙，说明一串钥匙都在我手上了
 8     print('%s拿到面了'%name)
 9     fork_lock.acquire()
10     print('%s拿到叉子了'%name)
11     print('%s吃面'%name)
12     fork_lock.release()
13     noodle_lock.release()
14 
15 def eat2(name):
16     fork_lock.acquire()
17     print('%s拿到叉子了' % name)
18     time.sleep(1)
19     noodle_lock.acquire()
20     print('%s拿到面了'%name)
21     print('%s吃面'%name)
22     noodle_lock.release()
23     fork_lock.release()
24 
25 Thread(target=eat1,args=('alex',)).start()
26 Thread(target=eat2,args=('Egon',)).start()
27 Thread(target=eat1,args=('bossjin',)).start()
28 Thread(target=eat1,args=('nezha',)).start()

运行结果：

转载于:https://www.cnblogs.com/xudj/p/10345932.html