GCD is separate from blocks; you can use one without the other. GCD/libdispatch is a library written for concurrent execution and to make it easier to manage. B

GCD is separate from blocks; you can use one without the other. GCD/libdispatch is a library written for concurrent execution and to make it easier to manage. Blocks are closures added to C, Objective-C and C++. Lambda's have also been (or rather, will be) added to C++, in C++0x. I've never used Intel's TBB, but it looks like it is similar to what libdispatch's purpose is. Of course, I could be way off base. But, I don't think I am.