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