What is threading in Visual c++ ?

As I say, this is not a topic for just one question and answer. Please try to start here:
http://en.wikipedia.org/wiki/Thread_%28computing%29[^],
http://en.wikipedia.org/wiki/Multi-core_%28computing%29[^],
http://en.wikipedia.org/wiki/Thread_pool_pattern[^],
http://en.wikipedia.org/wiki/Thread_safety[^],
http://en.wikipedia.org/wiki/Thread_synchronization[^].
 
Now, managed threading for .NET:
http://msdn.microsoft.com/en-us/library/hh156548.aspx[^],
http://msdn.microsoft.com/en-us/library/3e8s7xdd%28v=vs.110%29.aspx[^],
http://msdn.microsoft.com/en-us/library/system.threading.aspx[^].
 
This is pretty long way to go. Don't expect some simple cookbook recipes or a quick conceptual fix — they would not be helpful at this stage. This is more of education than of quick training in some techniques. The only one conceptual fix for you would be this: this topic is not covered by a swift cavalry attack.
 

—SA