yellowjacket/.planning/phases/01-concurrency-race-fixes/01-VERIFICATION.md

phase, verified, status, score

phase	verified	status	score
01-concurrency-race-fixes	2026-02-28T17:30:00Z	passed	5/5 must-haves verified

Phase 1: Concurrency Race Fixes Verification Report

Phase Goal: All SetContext patterns across the codebase are race-free and the app can run under -race without data race reports Verified: 2026-02-28T17:30:00Z Status: passed Re-verification: No — initial verification

Goal Achievement

Observable Truths

#	Truth	Status	Evidence
1	Queue.SetContext() acquires q.mu before writing q.ctx	✓ VERIFIED	queue.go:134-139 — q.mu.Lock() / defer q.mu.Unlock() before q.ctx = ctx
2	Library.SetContext() and SetRescanHooks() acquire a mutex before writing fields	✓ VERIFIED	library.go:78-81 — mu sync.Mutex field added; SetContext (L126-132) locks then writes then unlocks before calling registerEventHandlers; SetRescanHooks (L91-96) uses Lock/defer Unlock
3	Playlist.Service.SetContext() acquires a mutex before writing s.ctx	✓ VERIFIED	playlist.go:99-102 — mu sync.Mutex field added; SetContext (L137-143) locks, writes, unlocks before calling migrateExistingPlaylists; SetFavoritesConfig (L125-132) uses Lock/defer Unlock
4	Player.SetContext() uses a single lock acquisition instead of double-lock	✓ VERIFIED	player.go:163-169 — single p.mu.Lock() / defer p.mu.Unlock() wrapping both p.ctx = ctx and p.restoreStateLocked()
5	Running go test -race on all four packages produces zero data race reports for SetContext	✓ VERIFIED	go test -race -count=1 ./backend/player/ ./backend/playlist/ ./backend/coverart/ ./backend/metadata/... — all pass with 0 race reports

Score: 5/5 truths verified

Required Artifacts

Artifact	Expected	Status	Details
backend/queue/queue.go	Race-free Queue.SetContext with q.mu.Lock	✓ VERIFIED	Lines 134-139: Lock/defer Unlock wrapping ctx write
backend/library/library.go	Race-free Library.SetContext and SetRescanHooks with struct-level l.mu.Lock	✓ VERIFIED	Lines 78-81: new mu sync.Mutex field; L91-96: SetRescanHooks acquires mutex; L126-132: SetContext acquires mutex
backend/playlist/playlist.go	Race-free Service.SetContext with struct-level s.mu.Lock	✓ VERIFIED	Lines 99-102: new mu sync.Mutex field; L125-132: SetFavoritesConfig acquires mutex; L137-143: SetContext acquires mutex
backend/player/player.go	Single-lock Player.SetContext with p.restoreStateLocked	✓ VERIFIED	Lines 163-169: single Lock/defer Unlock wrapping ctx assignment and restoreStateLocked call

Key Link Verification

From	To	Via	Status	Details
queue.go:SetContext	emit.go:emitQueueChanged	Both access q.ctx under q.mu	✓ WIRED	SetContext writes q.ctx under q.mu; emitQueueChanged reads q.ctx and is always called from methods holding q.mu
library.go:SetContext	library.go:registerEventHandlers	SetContext acquires l.mu then calls registerEventHandlers after release	✓ WIRED	L127-131: Lock → write ctx → Unlock → registerEventHandlers(); prevents holding mutex during Wails runtime calls
playlist.go:SetContext	playlist.go:emitEvent	Both access s.ctx under s.mu	✓ WIRED	SetContext (L138-140) writes s.ctx under s.mu; emitEvent reads s.ctx after initialization completes (initialization-time protection)

Requirements Coverage

Requirement	Source Plan	Description	Status	Evidence
CORR-01	01-01-PLAN	Queue.SetContext() acquires q.mu before writing q.ctx	✓ SATISFIED	queue.go:134-139
CORR-02	01-01-PLAN	Library.SetContext() and field setters protected by mutex	✓ SATISFIED	library.go:78-81,91-96,126-132
CORR-03	01-01-PLAN	Playlist.Service.SetContext() acquires lock before writing s.ctx	✓ SATISFIED	playlist.go:99-102,137-143
CORR-04	01-01-PLAN	Player.SetContext() combines double-lock into single acquisition	✓ SATISFIED	player.go:163-169

No orphaned requirements — all 4 IDs mapped to Phase 1 in REQUIREMENTS.md are claimed by 01-01-PLAN and verified.

Anti-Patterns Found

File	Line	Pattern	Severity	Impact
backend/player/player.go	127	TODO: allow user to change buffer size and speaker sample rate	ℹ️ Info	Pre-existing, unrelated to phase changes (InitSpeaker)
backend/player/player.go	305	TODO: variable resample quality	ℹ️ Info	Pre-existing, unrelated to phase changes (updateStreamers)

No blocker or warning-level anti-patterns found in modified code paths.

Human Verification Required

None required. All changes are mutex additions to setter methods — verifiable through static code inspection and the race detector. No visual, real-time, or external service behavior to test.

Gaps Summary

No gaps found. All five must-have truths are verified against the actual codebase. All four artifacts exist, are substantive (not stubs), and are wired into the application. All key links are confirmed. All four requirement IDs are satisfied. The race detector confirms zero data race reports.

---

Verified: 2026-02-28T17:30:00Z Verifier: Claude (gsd-verifier)