condition.wait() 在 "with" 块或 self.acquire 和 self.release 中？

Question

使用条件变量时，使用 with 语句是否是一种不好的做法？

我知道 condition.wait() 释放了锁，但是如果在 with 块中调用它，这种行为会改变吗？

class BlockingQueue:

    def __init__(self, size):
        self.max_size = size
        self.queue = deque()
        self.condition = Condition()

    # if there are already x items in queue, should block
    def enqueue(self, item):
        with self.condition:
            while len(self.queue) == self.max_size:
                self.condition.wait()
            self.queue.append(item)
            self.condition.notify_all()

Answer 1

Condition 对象 documentation 部分表示：

A condition variable obeys the context management protocol: using the with statement acquires the associated lock for the duration of the enclosed block. The acquire() and release() methods also call the corresponding methods of the associated lock.

所以，是的，它们在 with 语句中工作得很好。事实上，这是使用它们的首选方式。

condition.wait() 在 "with" 块或 self.acquire 和 self.release 中？

condition.wait() in a "with" block or self.acquire and self.release?

python

concurrency

python-multithreading