C++14: Shared Timed Mutex

C++14 added a shared timed mutex. You can lock something as shared (like a reader lock) or exclusive (like a writer lock). Here is an example:

#include <iostream>
#include <shared_mutex>

int main()
{
  std::shared_timed_mutex MySharedTimedMutex;

  if (MySharedTimedMutex.try_lock_shared())
  {
    std::cout << "R+ ";
  }
  else
  {
    std::cout << "R- ";
  }
  if (MySharedTimedMutex.try_lock_shared())
  {
    std::cout << "R+ ";
  }
  else
  {
    std::cout << "R- ";
  }
  if (MySharedTimedMutex.try_lock())
  {
    std::cout << "W+ ";
  }
  else
  {
    std::cout << "W- ";
  }
  MySharedTimedMutex.unlock_shared();
  MySharedTimedMutex.unlock_shared();
  if (MySharedTimedMutex.try_lock())
  {
    std::cout << "W+ ";
  }
  else
  {
    std::cout << "W- ";
  }
  return 0;
}
// Output: R+ R+ W- W+

Reference: http://en.cppreference.com/w/cpp/thread/shared_timed_mutex