Shulou(Shulou.com)06/02 Report--

This article introduces the knowledge of "the application of C++ mutex mutex and lock". In the operation of practical cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

In multithreading, multiple threads access shared data, which should be the most common application.

If multiple threads just read the shared data, there will be no problem, but if some threads read the data and some threads write the data, there will be a problem. For example, thread A writes data, but in the middle of the process, thread B reads it, and the program crashes. At this time, we need the appearance of mutex!

Mutex:

The mutex mutex is a class that has a lock () method and a unlock () method. If you run the lock () method for the first time instead of the unlock () method, the program will stop here the second time you run the lock () method, and the second lock () method will not pass until you run the unlock () method. It is the use of this "lock" mechanism to ensure that two pieces of code run independently.

Example:

# include # include class A {public: void WriteFunction () {for (int I = 0; I < 1000; + + I) {std::cout

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