The Pillars of Composability

In this chapter, we discuss composability: what it is, what characteristics make Threading Building Blocks (TBB) a composable threading library, and how to use a library like TBB to create scalable applications. C++ is a composable language, and TBB adds parallelism in a way that maintains composability. Composability with TBB is highly valuable because it means we are free to expose opportunities for parallelism without worrying about overloading the system. If we do not expose parallelism, we limit scaling.