std::lock_guard 可以中断吗？

Question

If I have some code under lock_guard like:

std::thread t([&]()
{
    std::lock_guard<std::mutex> lock(m);
    // some simple operations
});

Do I have a guarantee that "some operations" will never be interrupted on this core cpu that t thread is running? Can there be context switching after lock_guard?

Answer 1

会有上下文切换，但可以保证所有其他线程都将被锁定在锁后面。

Answer 2

No, a critical section protected by a mutex is not going to run with real-time priority unless you explicitly request it to do so, which cannot be done using the standard C++ library. The kernel can still schedule another thread (in the same process, or some other process) that isn't waiting on the mutex. Setting real-time priority can only be done with OS-specific system calls.