python下线程以及锁

1、python多线程

#encoding=utf-8
"""
python多线程，并非真正意义上的多线程
全局锁：在指定时间里，有且只有一个线程在运行
 """
import threading
import time

def test(p):
    time.sleep(0.1)
    print p

# a = threading.Thread(target=test)
# b = threading.Thread(target=test)
# a.start()
# b.start()
# 
# a.join()
# b.join()

lst =[]
for i in xrange(0, 15):
    th = threading.Thread(target=test, args=[i])
    lst.append(th)

for i in lst:
    i.start()


for i in lst:
    i.join()
print "primary thread end!!!"

2、python下的锁

#encoding=utf-8

"""
1、python全局锁：GLT
  python多线程在任意时刻下只有一个线程在运行，它是线程安全的
"""

import threading

num = 0
def t():
    global num
    num +=1
    print num
    
for i in xrange(0, 10):
    d = threading.Thread(target=t)
    d.start()


import time
b_time = time.time()
_a = threading.Thread(target=t)
_b = threading.Thread(target=t)
_a.start()
_b.start()

_a.join()
_b.join()

print time.time()-b_time

"""
加锁：acquire()
解锁：release()
RLock()可重入锁
"""
import threading
mlock = threading.Lock()
#mlock = threading.RLock()

num_01 = 0
def a():
    global num_01
    mlock.acquire()
    num_01 += 1
    mlock.release()
    print num_01
    
for i in xrange(0, 10):
    d = threading.Thread(target=a)
    d.start()