unique_lock加锁try_to_lock

#include <iostream>
#include <mutex>
#include <thread>

void msg_func()
{
   std::mutex mutex;

   while(1)
   {
      std::unique_lock<std::mutex> unique(mutex, std::try_to_lock);
      if(unique.owns_lock())
      {
         std::cout << "owns_lock" << std::endl;
         std::cout << "do something" << std::endl;
      }
      else
      {
         std::cout << "try_to_lock fail" << std::endl;
      }

      std::chrono::milliseconds second(1000);
      std::this_thread::sleep_for(second);
   }
}

int main()
{
   std::thread mythread(&msg_func);
   getchar();

   return 0;
}

$ g++ unique_lock.cpp -std=c++11 -pthread

$ ./a.out 
owns_lock
do something
owns_lock
do something