81 lines
1.9 KiB
Go
81 lines
1.9 KiB
Go
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package watchdog
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import "sync"
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var (
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gcNotifeeMutex sync.Mutex
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gcNotifees []notifeeEntry
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forcedGCNotifeeMutex sync.Mutex
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forcedGCNotifees []notifeeEntry
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)
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// RegisterPostGCNotifee registers a function that is called every time a GC has happened,
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// both GC runs triggered by the Go runtime and by watchdog.
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// The unregister function returned can be used to unregister this notifee.
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func RegisterPostGCNotifee(f func()) (unregister func()) {
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gcNotifeeMutex.Lock()
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defer gcNotifeeMutex.Unlock()
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var id int
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if len(gcNotifees) > 0 {
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id = gcNotifees[len(gcNotifees)-1].id + 1
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}
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gcNotifees = append(gcNotifees, notifeeEntry{id: id, f: f})
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return func() {
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gcNotifeeMutex.Lock()
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defer gcNotifeeMutex.Unlock()
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for i, entry := range gcNotifees {
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if entry.id == id {
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gcNotifees = append(gcNotifees[:i], gcNotifees[i+1:]...)
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}
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}
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}
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}
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func notifyGC() {
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if NotifyGC != nil {
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NotifyGC()
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}
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gcNotifeeMutex.Lock()
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defer gcNotifeeMutex.Unlock()
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for _, entry := range gcNotifees {
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entry.f()
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}
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}
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// RegisterPreGCNotifee registers a function that is called before watchdog triggers a GC run.
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// It is ONLY called when watchdog triggers a GC run, not when the Go runtime triggers it.
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// The unregister function returned can be used to unregister this notifee.
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func RegisterPreGCNotifee(f func()) (unregister func()) {
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forcedGCNotifeeMutex.Lock()
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defer forcedGCNotifeeMutex.Unlock()
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var id int
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if len(forcedGCNotifees) > 0 {
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id = forcedGCNotifees[len(forcedGCNotifees)-1].id + 1
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}
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forcedGCNotifees = append(forcedGCNotifees, notifeeEntry{id: id, f: f})
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return func() {
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forcedGCNotifeeMutex.Lock()
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defer forcedGCNotifeeMutex.Unlock()
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for i, entry := range forcedGCNotifees {
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if entry.id == id {
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forcedGCNotifees = append(forcedGCNotifees[:i], forcedGCNotifees[i+1:]...)
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}
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}
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}
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}
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func notifyForcedGC() {
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forcedGCNotifeeMutex.Lock()
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defer forcedGCNotifeeMutex.Unlock()
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for _, entry := range forcedGCNotifees {
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entry.f()
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}
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}
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