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-rw-r--r--event/event.go6
1 files changed, 5 insertions, 1 deletions
diff --git a/event/event.go b/event/event.go
index d11a0e9bd..540fbba65 100644
--- a/event/event.go
+++ b/event/event.go
@@ -3,6 +3,7 @@ package event
import (
"errors"
+ "fmt"
"reflect"
"sync"
)
@@ -40,6 +41,7 @@ var ErrMuxClosed = errors.New("event: mux closed")
func (mux *TypeMux) Subscribe(types ...interface{}) Subscription {
sub := newsub(mux)
mux.mutex.Lock()
+ defer mux.mutex.Unlock()
if mux.stopped {
close(sub.postC)
} else {
@@ -49,13 +51,15 @@ func (mux *TypeMux) Subscribe(types ...interface{}) Subscription {
for _, t := range types {
rtyp := reflect.TypeOf(t)
oldsubs := mux.subm[rtyp]
+ if find(oldsubs, sub) != -1 {
+ panic(fmt.Sprintf("event: duplicate type %s in Subscribe", rtyp))
+ }
subs := make([]*muxsub, len(oldsubs)+1)
copy(subs, oldsubs)
subs[len(oldsubs)] = sub
mux.subm[rtyp] = subs
}
}
- mux.mutex.Unlock()
return sub
}