Further reading

• FFI examples written in Rust, available at https://github.com/alexcrichton/rust-ffi-examples. This repository by Alex Crichton is a well-done collection of FFI examples in Rust. The documentation in this book on this topic is quite good, but it never hurts to pour through working code.
• Hacker's Delight, Henry Warren Jr. If you enjoyed the bit fiddling present in this chapter's take on feruscore, you'll love Hacker's Delight. It's old now and some of its algorithms no longer function on 64-bit words, but it's still well worth reading, especially if you, like me, work to keep fixed-width types as small as possible.
• Foreign Function Interface, available at https://doc.rust-lang.org/nomicon/ffi.html. The Nomicon builds a higher-level wrapper for the compression library snappy. This wrapper is extended in ways we did not touch on here, specifically with regard to C callbacks and vardic function calls.
• Global Interpreter Lock, available at https://wiki.python.org/moin/GlobalInterpreterLock...