The context package internals
summary
Examines Go's context internals by reading the std lib: actual types are emptyContext, valueContext, cancelContext and a timer-backed context, with concrete code for WithValue/Value traversal (no map, it walks a parent chain), WithCancel wiring parent↔child links and a lazily created done channel, cancel propagation that closes done and removes child links, WithDeadline/WithTimeout using timers that stop to avoid leaks, and the Go 1.20 addition WithCancelCodes for propagating cancel reasons; all examples compile and demonstrate the propagation behavior.
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chapters (8)
- 0:00Introduction
- 1:25Context package overview
- 3:31Initial contexts Background TODO
- 6:39Storing retrieving values
- 14:44Cancellation signals propagation
- 34:12Cancellation with error codes
- 34:34Deadlines in contexts
- 48:31Summary
