from threading import Lock,Thread
import time
def func():
global n
temp = n
time.sleep(0.2)
n = temp -1
n = 10
t_lst = []
for i in range(10):
t = Thread(target=func)
t.start()
t_lst.append(t)
for t in t_lst: t.join()
print(n)
from threading import Lock,Thread
import time
def func(lock):
global n
lock.acquire()
temp = n
time.sleep(0.2)
n = temp -1
lock.release()
n = 10
t_lst = []
lock = Lock()
for i in range(10):
t = Thread(target=func,args=(lock,))
t.start()
t_lst.append(t)
for t in t_lst: t.join()
print(n)
from threading import Thread,Lock
import time
noodle_lock = Lock()
fork_lock = Lock()
def eat1(name):
noodle_lock.acquire()
print('%s拿到面条啦'%name)
fork_lock.acquire()
print('%s拿到叉子了'%name)
print('%s吃面'%name)
fork_lock.release()
noodle_lock.release()
def eat2(name):
fork_lock.acquire()
print('%s拿到叉子了'%name)
time.sleep(1)
noodle_lock.acquire()
print('%s拿到面条啦'%name)
print('%s吃面'%name)
noodle_lock.release()
fork_lock.release()
Thread(target=eat1,args=('alex',)).start()
Thread(target=eat2,args=('Egon',)).start()
Thread(target=eat1,args=('bossjin',)).start()
Thread(target=eat1,args=('nezha',)).start()
from threading import RLock # 递归锁
fork_lock = noodle_lock = RLock() # 一个钥匙串上的两把钥匙
def eat1(name):
noodle_lock.acquire() # 一把钥匙
print('%s拿到面条啦'%name)
fork_lock.acquire()
print('%s拿到叉子了'%name)
print('%s吃面'%name)
fork_lock.release()
noodle_lock.release()
def eat2(name):
fork_lock.acquire()
print('%s拿到叉子了'%name)
time.sleep(1)
noodle_lock.acquire()
print('%s拿到面条啦'%name)
print('%s吃面'%name)
noodle_lock.release()
fork_lock.release()
Thread(target=eat1,args=('alex',)).start()
Thread(target=eat2,args=('Egon',)).start()
Thread(target=eat1,args=('bossjin',)).start()
Thread(target=eat2,args=('nezha',)).start()
