I am Anshul Mittal building webserver using C++. I have found a new solution to a problem.

When a single thread tries locking on the same mutex std::mutex it creates a deadlock. This situation can arise in some projects and it arose for me. 

I am sending this proposal to update the specification to incorporate this new technology.

The std::mutex should not allow locking if the same thread is requesting the lock on same mutex. 

You can get thread id using std::this_thread::get_id().

Eg. 

Current situation : 

mutex mut;

mut.lock();

mut.lock();

This creates a deadlock.

By putting thread id check the deadlock is prevented. I call this SampleMutex.

SampleMutex mut;

mut.lock();

mut.lock(); // This lock should not happen and no deadlock created.