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atexit: allow functions to be unregistered
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parent
5240f9d1e5
commit
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@ -13,23 +13,32 @@ import (
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)
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var (
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fns []func()
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fns = make(map[FnHandle]bool)
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fnsMutex sync.Mutex
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exitChan chan os.Signal
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exitOnce sync.Once
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registerOnce sync.Once
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)
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// Register a function to be called on exit
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func Register(fn func()) {
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fns = append(fns, fn)
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// FnHandle is the type of the handle returned by function `Register`
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// that can be used to unregister an at-exit function
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type FnHandle *func()
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// Register a function to be called on exit.
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// Returns a handle which can be used to unregister the function with `Unregister`.
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func Register(fn func()) FnHandle {
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fnsMutex.Lock()
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fns[&fn] = true
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fnsMutex.Unlock()
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// Run AtExit handlers on SIGINT or SIGTERM so everything gets
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// tidied up properly
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registerOnce.Do(func() {
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exitChan = make(chan os.Signal, 1)
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signal.Notify(exitChan, os.Interrupt) // syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT
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go func() {
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sig, closed := <-exitChan
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if closed || sig == nil {
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sig := <-exitChan
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if sig == nil {
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return
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}
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fs.Infof(nil, "Signal received: %s", sig)
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@ -38,6 +47,15 @@ func Register(fn func()) {
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os.Exit(0)
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}()
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})
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return &fn
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}
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// Unregister a function using the handle returned by `Register`
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func Unregister(handle FnHandle) {
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fnsMutex.Lock()
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defer fnsMutex.Unlock()
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delete(fns, handle)
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}
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// IgnoreSignals disables the signal handler and prevents Run from beeing executed automatically
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@ -53,8 +71,10 @@ func IgnoreSignals() {
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// Run all the at exit functions if they haven't been run already
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func Run() {
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exitOnce.Do(func() {
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for _, fn := range fns {
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fn()
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fnsMutex.Lock()
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defer fnsMutex.Unlock()
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for fnHandle := range fns {
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(*fnHandle)()
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}
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})
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}
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