The Guard pattern in Rust
summary
Explains the Guard pattern as a concrete Rust idiom: a lock guard type that proves invariants at compile time and unlocks on Drop, applied to a Postgres-backed PG mutex implemented with advisory locks and used in the EventSourceRS library for pessimistic locking; it works for low contention but causes connection-pool starvation unless paired with try_acquire, involves tricky self-referential lifetimes and async-drop problems, and shows a simpler scope guard wrapper around a closure that can be dismissed.
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chapters (9)
- 0:00Guard pattern intro
- 2:35Naive mutex problems
- 5:27RAII and Guard definition
- 8:16Guard enforces invariants
- 10:03PostgreSQL use case
- 13:44Lessons and sync pitfalls
- 15:29ScopeGuard in Linux kernel
- 18:44Guard caveats
- 19:27Summary
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