1 files changed, 18 insertions, 6 deletions
diff --git a/vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go b/vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go
index f7f40a16a..19b9d6392 100644
--- a/vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go
+++ b/vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go
@@ -53,16 +53,28 @@ func NewCallbackSerializer(ctx context.Context) *CallbackSerializer {
 	return cs
 }
 
-// Schedule adds a callback to be scheduled after existing callbacks are run.
+// TrySchedule tries to schedules the provided callback function f to be
+// executed in the order it was added. This is a best-effort operation. If the
+// context passed to NewCallbackSerializer was canceled before this method is
+// called, the callback will not be scheduled.
 //
 // Callbacks are expected to honor the context when performing any blocking
 // operations, and should return early when the context is canceled.
+func (cs *CallbackSerializer) TrySchedule(f func(ctx context.Context)) {
+	cs.callbacks.Put(f)
+}
+
+// ScheduleOr schedules the provided callback function f to be executed in the
+// order it was added. If the context passed to NewCallbackSerializer has been
+// canceled before this method is called, the onFailure callback will be
+// executed inline instead.
 //
-// Return value indicates if the callback was successfully added to the list of
-// callbacks to be executed by the serializer. It is not possible to add
-// callbacks once the context passed to NewCallbackSerializer is cancelled.
-func (cs *CallbackSerializer) Schedule(f func(ctx context.Context)) bool {
-	return cs.callbacks.Put(f) == nil
+// Callbacks are expected to honor the context when performing any blocking
+// operations, and should return early when the context is canceled.
+func (cs *CallbackSerializer) ScheduleOr(f func(ctx context.Context), onFailure func()) {
+	if cs.callbacks.Put(f) != nil {
+		onFailure()
+	}
 }
 
 func (cs *CallbackSerializer) run(ctx context.Context) {