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@ -65,6 +65,11 @@ type Tracker struct {
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// magicsock receive functions: IPv4, IPv6, and DERP.
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MagicSockReceiveFuncs [3]ReceiveFuncStats // indexed by ReceiveFunc values
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// initOnce guards the initialization of the Tracker.
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// Notably, it initializes the MagicSockReceiveFuncs names.
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// mu should not be held during init.
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initOnce sync.Once
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// mu guards everything that follows.
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mu sync.Mutex
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@ -433,6 +438,7 @@ func (t *Tracker) RegisterWatcher(cb func(w *Warnable, r *UnhealthyState)) (unre
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if t.nil() {
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return func() {}
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}
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t.initOnce.Do(t.doOnceInit)
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t.mu.Lock()
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defer t.mu.Unlock()
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if t.watchers == nil {
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@ -859,6 +865,7 @@ func (t *Tracker) timerSelfCheck() {
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if t.nil() {
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return
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}
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t.initOnce.Do(t.doOnceInit)
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t.mu.Lock()
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defer t.mu.Unlock()
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t.checkReceiveFuncsLocked()
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@ -1168,6 +1175,11 @@ type ReceiveFuncStats struct {
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missing bool
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}
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// Name returns the name of the receive func ("ReceiveIPv4", "ReceiveIPv6", etc).
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func (s *ReceiveFuncStats) Name() string {
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return s.name
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}
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func (s *ReceiveFuncStats) Enter() {
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s.numCalls.Add(1)
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s.inCall.Store(true)
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@ -1185,15 +1197,20 @@ func (t *Tracker) ReceiveFuncStats(which ReceiveFunc) *ReceiveFuncStats {
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if t == nil {
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return nil
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}
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t.initOnce.Do(t.doOnceInit)
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return &t.MagicSockReceiveFuncs[which]
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}
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func (t *Tracker) doOnceInit() {
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for i := range t.MagicSockReceiveFuncs {
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f := &t.MagicSockReceiveFuncs[i]
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f.name = (ReceiveFunc(i)).String()
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}
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}
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func (t *Tracker) checkReceiveFuncsLocked() {
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for i := range t.MagicSockReceiveFuncs {
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f := &t.MagicSockReceiveFuncs[i]
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if f.name == "" {
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f.name = (ReceiveFunc(i)).String()
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}
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if runtime.GOOS == "js" && i < 2 {
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// Skip IPv4 and IPv6 on js.
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continue
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