How could I do?

Thanks for your any advice!

Have you read anything on resource contention or any other background?

Try the 'tutorial' on msdn:
http://msdn.microsoft.com/en-us/library/ms684841%28VS.85%29.aspx

You may also want to check this out.
http://msdn.microsoft.com/en-us/magazine/cc163744.aspx

There are different types of multi threaded programmings.
1. Windows threads (Only on windows)
2. pthreads (Low level)
3. OpenMP (Supported by VS2008 professional ed, on win as well as unix)

After you learn how threading works, you could also try the platform-independent Boost thread library.