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interrupt corner case - addInterruptHandler hangs #154

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interrupt corner case - addInterruptHandler hangs #154

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10 changes: 10 additions & 0 deletions signal.go
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Expand Up @@ -9,6 +9,8 @@ import (
"os/signal"
)

var shutdownInProgress bool

// interruptChannel is used to receive SIGINT (Ctrl+C) signals.
var interruptChannel chan os.Signal

Expand All @@ -27,7 +29,9 @@ func mainInterruptHandler() {
for {
select {
case <-interruptChannel:
shutdownInProgress = true
btcdLog.Infof("Received SIGINT (Ctrl+C). Shutting down...")

// run handlers in LIFO order.
for i := range interruptCallbacks {
idx := len(interruptCallbacks) - 1 - i
Expand All @@ -47,6 +51,12 @@ func mainInterruptHandler() {
// addInterruptHandler adds a handler to call when a SIGINT (Ctrl+C) is
// received.
func addInterruptHandler(handler func()) {
// if shutdown is in progress, just finish the handler and exit
if shutdownInProgress {
handler()
return
}

// Create the channel and start the main interrupt handler which invokes
// all other callbacks and exits if not already done.
if interruptChannel == nil {
Expand Down