24.2. Concurrent Programming with Threads

As a building block for concurrent programs, most programming languages provide a way of creating multiple independent threads of control. Haskell is no exception, though programming with threads in Haskell looks somewhat different than in other languages.

In Haskell, a thread is an IO action that executes independently from other threads. To create a thread, we import the Control.Concurrent module and use the forkIO function: