Home Backend Development Python Tutorial python线程锁(thread)学习示例

python线程锁(thread)学习示例

Jun 16, 2016 am 08:45 AM
python thread

复制代码 代码如下:

# encoding: UTF-8
import thread
import time

# 一个用于在线程中执行的函数
def func():
    for i in range(5):
        print 'func'
        time.sleep(1)

    # 结束当前线程
    # 这个方法与thread.exit_thread()等价
    thread.exit() # 当func返回时,线程同样会结束

# 启动一个线程,线程立即开始运行
# 这个方法与thread.start_new_thread()等价
# 第一个参数是方法,第二个参数是方法的参数
thread.start_new(func, ()) # 方法没有参数时需要传入空tuple

# 创建一个锁(LockType,不能直接实例化)
# 这个方法与thread.allocate_lock()等价
lock = thread.allocate()

# 判断锁是锁定状态还是释放状态
print lock.locked()

# 锁通常用于控制对共享资源的访问
count = 0

# 获得锁,成功获得锁定后返回True
# 可选的timeout参数不填时将一直阻塞直到获得锁定
# 否则超时后将返回False
if lock.acquire():
    count += 1

    # 释放锁
    lock.release()

# thread模块提供的线程都将在主线程结束后同时结束
time.sleep(6)

thread 模块提供的其他方法:
thread.interrupt_main(): 在其他线程中终止主线程。
thread.get_ident(): 获得一个代表当前线程的魔法数字,常用于从一个字典中获得线程相关的数据。这个数字本身没有任何含义,并且当线程结束后会被新线程复用。

thread还提供了一个ThreadLocal类用于管理线程相关的数据,名为 thread._local,threading中引用了这个类。

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