到Mutex还是不Mutex？ [英] To Mutex or Not To Mutex?

问题描述

如果我只有一个读卡器和一个写卡器，我需要互斥吗？读取器从队列中接收下一个命令（ food.front（）），并根据该命令执行任务。命令执行后，它将弹出命令。队列中的作者将命令推送到队列上（ food.push（））。

Do I need a mutex if I have only one reader and one writer? The reader takes the next command (food.front()) from the queue and executes a task based on the command. After the command is executed, it pops off the command. The writer to the queue pushes commands onto the queue (food.push()).

互斥？我的读者（消费者）只执行如果 food.size（）> 0 。我使用读取器线程和发送线程。

Do I need a mutex? My reader (consumer) only executes if food.size() > 0. I am using a reader thread and send thread.

推荐答案

互斥体在多线程环境中使用。

A mutex is used in multi-threaded environments. I don't see mention of threads in your question, so I don't see a need for a mutex.

但是，如果我们假设读者和作家你的意思是你有两个线程，你需要用互斥量（或其他多线程保护方案）保护相互的数据。

However, if we assume by reader and writer you mean you have two threads, you need to protect mutual data with a mutex (or other multi-threaded protection scheme.)

当队列有项目时会发生什么，读者线程弹出东西，而作者线程放什么东西？灾害！使用互斥锁，你一定只有一个线程一次在队列上操作。

What happens when the queue has items, and the reader thread pops something off while the writer thread puts something on? Disaster! With a mutex, you'll be sure only one thread is operating on the queue at a time.

另一种方法是一个无锁的线程安全队列。它将使用原子操作来确保数据不会被错误地操作。

Another method is a lock-free thread-safe queue. It would use atomic operations to ensure the data isn't manipulated incorrectly.

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