C++11: timed_mutex: try_lock_for

C++11 added a timed_mutex template class that allows you to try for a lock for a specified period of time. Here is an example:

#include <iostream>
#include <mutex>
#include <thread>
 
std::timed_mutex gTimedMutex;
 
int main()
{
  if (gTimedMutex.try_lock_for(std::chrono::milliseconds(100)))
  {
    std::cout << "got_lock ";
  }
  else
  {
    std::cout << "try_lock_timeout ";
  }
  if (gTimedMutex.try_lock_for(std::chrono::milliseconds(100)))
  {
    std::cout << "got_lock ";
  }
  else
  {
    std::cout << "try_lock_timeout ";
  }
  gTimedMutex.unlock();
  if (gTimedMutex.try_lock_for(std::chrono::milliseconds(100)))
  {
    std::cout << "got_lock ";
  }
  else
  {
    std::cout << "try_lock_timeout ";
  }
 
  std::cout << std::endl;
  return 0;
}
// Output: got_lock try_lock_timeout got_lock

Reference: https://isocpp.org/wiki/faq/cpp11-library-concurrency#std-mutex

           http://en.cppreference.com/w/cpp/thread/timed_mutex/try_lock_for