lock = threading.Lock() res = lock.acquire(timeout=10) if res: # do something ... lock.release() else: # do something else ... 我宁愿使用 with-statement 而不是显式的“acquire”和“release”,但我不知道如何获得超时效果。 您可以使用上下文管理器轻松完成此操作: import threading from contex...
Lock、RLock、Condition、Semaphore 2、测试用例 #coding : utf-8importthreadingimportlogging logging.basicConfig(level=logging.DEBUG, format='(%(threadName)-10s) %(message)s',)defthreading_with(statement): with statement: logging.debug('%s acquired via with'%statement)defthreading_not_with(statement)...
with语句不仅可以管理文件,还可以管理锁、连接等等,如下面的例子: #管理锁importthreading lock=threading.lock() with lock:#执行一些操作pass 上下文管理器 在上文中我们提到with语句中的上下文管理器。with语句可以如此简单但强大,主要依赖于上下文管理器。那么什么是上下文管理器?上下文管理器就是实现了上下文协议的类...
some_lock = threading.Lock() some_lock.acquire() try: ... finally: some_lock.release() 而对应的 with 语句,同样非常简洁: some_lock = threading.Lock() with somelock: ... 什么场景建议考虑使用上下文管理器和with语句 从前面的例子中可以看出,上下文管理器的常见用途是自动打开和关闭文件以及锁的申...
Another good example of using the with statement effectively in the Python standard library is threading.Lock. This class provides a primitive lock to prevent multiple threads from modifying a shared resource at the same time in a multithreaded application. You can use a Lock object as the contex...
) my_lock.acquire() print('acquire a lock') >>> an exception, aha! 解决的方法很简单,使用python的with语句即可 from threading import Lock lock = Lock() def get_data_from_file_v2(filename): # with with statement, we can handle exception that happen within thread. with lock,open(file...
Supporting with in Your Own Objects Now, there’s nothing special or magical about the open() function or the threading. Lock class and the fact that they can be used with a with statement. You can provide the same functionality in your own classes and functions by implementing so-called ...
3、threading.Lock() l.acquire() l.release() -- coding: utf-8 -- import threading shared_resource_with_lock = 0 shared_resource_with_no_lock = 0 COUNT = 100000 shared_resource_lock = threading.Lock() 有锁的情况 def increment_with_lock(): global shared_resource_with_lock for i in ...
import threading lock = threading.lock() with lock: #执行一些操作 pass 1. 2. 3. 4. 5. 6. 上下文管理器 在上文中我们提到with语句中的上下文管理器。with语句可以如此简单但强大,主要依赖于上下文管理器。那么什么是上下文管理器?上下文管理器就是实现了上下文协议的类,而上下文协议就是一个类要实现__en...
self.lock = threading.Lock() The SharedResource class is initialized with a Lock to protect the shared value. with self.lock: # Acquire and release the lock automatically The with statement is used to automatically acquire and release the lock, ensuring proper synchronization. shared_resource = ...