Simple Deadlock Examples

Question

I would like to explain threading deadlocks to newbies. I have seen many examples for deadlocks in the past, some using code and some using illustrations (like the famous 4

Answer 1

A sneaky way to deadlock with just a single thread is to try to lock the same (non-recursive) mutex twice. This might not be the simple example you were looking for, but sure enough I encountered such cases already.

#include 
#include 

int main()
{
  std::mutex m;
  m.lock();
  m.lock();
  std::cout << "Expect never to get here because of a deadlock!";
}