c++ - 锁定多个互斥锁

Question

我想知道是否可以同时锁定多个互斥锁，例如:

 Mutex1.Lock();
 {
     Mutex2.Lock();
     {
          // Code locked by mutex 1 and 2.
     }
     Mutex2.Unlock();

     // Code locked by mutex 1.
 }
 Mutex1.Unlock();

这在某些情况下会非常有用。谢谢。

Answer 1

std::lock 似乎就是为此目的而存在的。

Locks the given Lockable objects lock1, lock2, ..., lockn using a deadlock avoidance algorithm to avoid deadlock. The objects are locked by an unspecified series of calls to lock, try_lock, unlock. If a call to lock or unlock results in an exception, unlock is called for any locked objects before rethrowing.

http://en.cppreference.com/w/cpp/thread/lock