11.2 Synchronization🔗ℹ

Racket’s synchronization toolbox spans four layers:

• synchronizable events — a general framework for synchronization;

• channels — a primitive that can be used, in principle, to build most other kinds of synchronizable events (except the ones that compose events); and

• semaphores — a simple and especially cheap primitive for synchronization.

• future semaphores — a simple synchronization primitive for use with futures.