How to easily make std::cout thread-safe?

Question

I have a multi-threaded application, which heavily uses std::cout for logging without any locking. In such a case, how can I easily add lock mechanism to make <

Answer 1

For fast debugging c++11 applications and avoid interleaved output I just write small functions like these:

...
#include 
...
mutex m_screen;
...
void msg(char const * const message);
...
void msg(char const * const message)
{
  m_screen.lock();
  cout << message << endl;
  m_screen.unlock();
}

I use these types of functions for outputs and if numeric values are needed I just use something like this:

void msgInt(char const * const message, int const &value);
...
void msgInt(char const * const message, int const &value)
{
  m_screen.lock();
  cout << message << " = " << value << endl;
  m_screen.unlock();
}

This is easy and works fine to me, but I don't really know if it is technically correct. So I would be glad to hear your opinions.

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Well, I didn't read this:

I don't want to search for each occurrence of std::cout and add a line of locking code.

I'm sorry. However I hope it helps somebody.