Is there any thread library which can parse through code and find blocks of code which can be threaded and accordingly add the required threading instructions.
Also I want to check performance of a multithreaded program as compared to its single thread version. For this I would need to monitor the CPU usage(how much each processor is getting used). Is there any tool available to do this?
Some compilers (such as recent versions of the Intel compiler and gcc) can automatically parallelize simple loops, but anything beyond that is too complex. On the other hand, there are task libraries that use thread pools, and will automatically scale the number of threads to the available processors, and divide the work between them. Of course, using such a library will require rewriting your code to do so.
Structuring your application to make best use of multithreading is not a simple matter, and requires careful thought about which parts of your application can best make use of it. This is not something that can be automated.