compare_and_swap "migration" documentation should explain how to get return value · Issue #80486 · rust-lang/rust (original) (raw)

Skip to content

Navigation Menu

• • GitHub Copilot Write better code with AI
  • GitHub Advanced Security Find and fix vulnerabilities
  • Actions Automate any workflow
  • Codespaces Instant dev environments
  • Issues Plan and track work
  • Code Review Manage code changes
  • Discussions Collaborate outside of code
  • Code Search Find more, search less
• Explore
  • Learning Pathways
  • Events & Webinars
  • Ebooks & Whitepapers
  • Customer Stories
  • Partners
  • Executive Insights
• • GitHub Sponsors Fund open source developers
  • The ReadME Project GitHub community articles
• • Enterprise platform AI-powered developer platform
• Pricing

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Sign up

Appearance settings

Description

The compare_and_swap docs explain how to switch the order to compare_exchange, but that is not the only difference: the return type also changed. The docs don't say anything about how to best get the old behavior back with the new method. Many concurrent algorithms are written based on getting the old value back, so there should be a convenient way to get that behavior.

Cc @faern