Glossary

`XCHG` with memory is always atomic

no LOCK prefix needed. This makes `XCHG [lock], al` a valid spinlock implementation without the explicit LOCK.

Learn More

Assembly Language — Chapter 30 Key Takeaways: Concurrency at the Hardware Level

Related Terms

"Branch Misprediction Cost" "Branchless Equivalents of Simple Functions" "Data Structures in the Linux Kernel" "Engineering a Compiler" by Cooper and Torczon "Exploiting the Hard-Working DWARF" "Falsehoods Programmers Believe About Money" "Function Call Conventions and Stack Frame Layout" "Function Call Overhead"

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