Pragma Conference 2024: A deep dive into Sendable

Detailed image description of the sketchnote

Swift Safety

• Optionals
• Memory overflows
• Explicit Error Handling
• Type checking

... to stop undefined behavior.

• Sendable checks for data races at compile time.
• @Sendable for closures
• Sendable in Reference Types?
  • @MainActor
  • actor
  • manual synch with locks @unchecked sendable (use with caution)
  • nonisolated (unsafe) (use with caution)
  • Just because you don't get emors, doesn't mean your app is safe..
  • func addPerson(_ person: sending Person)
  • sendable ＝= thread safety
  • lots of Swift Evolutions in GitHub
  • @preconcurrency for backwards compability