| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "sync" |
| 5 | "time" |
| 6 | ) |
| 7 | |
| 8 | type tabLayoutSave struct { |
| 9 | dir string |
| 10 | entries []desktopTabEntry |
| 11 | activeID string |
| 12 | version uint64 |
| 13 | } |
| 14 | |
| 15 | // Only rebuildable navigation layout is coalesced. Session durability barriers |
| 16 | // remain synchronous in SetActiveTab and are never owned by this queue. |
| 17 | type tabLayoutWriter struct { |
| 18 | mu sync.Mutex |
| 19 | pending *tabLayoutSave |
| 20 | done chan struct{} |
| 21 | flush chan struct{} |
| 22 | } |
| 23 | |
| 24 | func (a *App) queueTabLayoutSave(dir string, entries []desktopTabEntry, activeID string, version uint64) { |
| 25 | q := &a.desktopSessions.layoutWrites |
| 26 | q.mu.Lock() |
| 27 | if a.shuttingDown.Load() { |
| 28 | q.mu.Unlock() |
| 29 | return |
| 30 | } |
| 31 | if q.pending == nil || version >= q.pending.version { |
| 32 | q.pending = &tabLayoutSave{dir, entries, activeID, version} |
| 33 | } |
| 34 | if q.done != nil { |
| 35 | q.mu.Unlock() |
| 36 | return |
| 37 | } |
| 38 | q.done, q.flush = make(chan struct{}), make(chan struct{}, 1) |
| 39 | flush := q.flush |
| 40 | q.mu.Unlock() |
| 41 | go func() { |
| 42 | timer := time.NewTimer(25 * time.Millisecond) |
| 43 | defer timer.Stop() |
| 44 | select { |
| 45 | case <-timer.C: |
| 46 | case <-flush: |
| 47 | } |
| 48 | for { |
| 49 | q.mu.Lock() |
| 50 | next := q.pending |
| 51 | q.pending = nil |
| 52 | if next == nil { |
| 53 | close(q.done) |
| 54 | q.done, q.flush = nil, nil |
| 55 | q.mu.Unlock() |
| 56 | return |
| 57 | } |
| 58 | q.mu.Unlock() |
| 59 | a.saveTabsWrite(next.dir, next.entries, next.activeID, next.version) |
| 60 | } |
| 61 | }() |
| 62 | } |
| 63 | |
| 64 | func (a *App) queueCurrentTabLayout() { |
| 65 | a.mu.Lock() |
| 66 | dir, entries, activeID, version := a.saveTabsCollectLocked() |
| 67 | a.mu.Unlock() |
| 68 | a.queueTabLayoutSave(dir, entries, activeID, version) |
| 69 | } |
| 70 | |
| 71 | func (a *App) flushTabLayoutWrites() { |
| 72 | q := &a.desktopSessions.layoutWrites |
| 73 | q.mu.Lock() |
| 74 | done := q.done |
| 75 | if done != nil { |
| 76 | select { |
| 77 | case q.flush <- struct{}{}: |
| 78 | default: |
| 79 | } |
| 80 | } |
| 81 | q.mu.Unlock() |
| 82 | if done != nil { |
| 83 | <-done |
| 84 | } |
| 85 | } |
| 86 |