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The mutex class is a synchronization primitive that can be used to protect shared data from being simultaneously accessed by multiple threads How do mutexes really work? A calling thread owns a mutex from the time that it successfully calls either lock or try_lock until it calls unlock.

My question to the community The mutex would succumb to the same problem it is meant to prevent What is a mutex and how do you use it?

Class std::mutex namespace std { class mutex { public

Mutex (const mutex &) = delete Mutex & operator =(const mutex &) = delete < cpp ‎ | thread ‎ | mutex c++ compiler support freestanding and hosted language standard library standard library headers named requirements feature test macros (c++20) language support library concepts library (c++20) diagnostics library memory management library metaprogramming library (c++11) general utilities library containers library. 互斥锁（mutex）的底层原理是什么？ 操作系统具体是怎么实现的？ ？ 为什么一个线程拿到锁以后，另一个线程就无法获得锁，面试中遇到了这个问题，希望各位大神解答一下 显示全部 关注者 1,136

In general, mutex and semaphore target different use cases A semaphore is for signalling, a mutex is for mutual exclusion Mutual exclusion means you want to make sure that multiple threads cannot execute certain critical sections of code at the same time Std::mutex is the only synchronization facility in the standard library for this use case.

If another thread has already locked the mutex, a call to lock will block execution until the lock is acquired

If lock is called by a thread that already owns the mutex, the behavior is undefined For example, the program may deadlock. The recursive_mutex class is a synchronization primitive that can be used to protect shared data from being simultaneously accessed by multiple threads Recursive_mutex offers exclusive, recursive ownership semantics

A calling thread owns a recursive_mutex for a period of time that starts when it successfully calls either lock or try_lock. I've heard these words related to concurrent programming, but what's the difference between lock, mutex and semaphore? However, how is this implemented To lock itself, the mutex has to set a bit somewhere that says that it is locked

But what if the second mutex is reading at the same time the first is writing

Worse, what if they both lock the mutex at the same time

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