From 17b57078ab5388d830c28965717c3cc52bb845e1 Mon Sep 17 00:00:00 2001
From: Michael Anthony Knyszek <mknyszek@google.com>
Date: Wed, 15 Oct 2025 21:19:13 +0000
Subject: [PATCH] internal/runtime/cgobench: add cgo callback benchmark

Change-Id: I43ea575aff87a3e420477cb26d35185d03df5ccc
Reviewed-on: https://go-review.googlesource.com/c/go/+/713283
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
---
 src/internal/runtime/cgobench/bench_test.go | 14 ++++++++++++++
 src/internal/runtime/cgobench/funcs.go      | 15 +++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/src/internal/runtime/cgobench/bench_test.go b/src/internal/runtime/cgobench/bench_test.go
index b4d8efec5e..3b8f9a8ca3 100644
--- a/src/internal/runtime/cgobench/bench_test.go
+++ b/src/internal/runtime/cgobench/bench_test.go
@@ -24,3 +24,17 @@ func BenchmarkCgoCallParallel(b *testing.B) {
 		}
 	})
 }
+
+func BenchmarkCgoCallWithCallback(b *testing.B) {
+	for b.Loop() {
+		cgobench.Callback()
+	}
+}
+
+func BenchmarkCgoCallParallelWithCallback(b *testing.B) {
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			cgobench.Callback()
+		}
+	})
+}
diff --git a/src/internal/runtime/cgobench/funcs.go b/src/internal/runtime/cgobench/funcs.go
index db685180a1..91efa51278 100644
--- a/src/internal/runtime/cgobench/funcs.go
+++ b/src/internal/runtime/cgobench/funcs.go
@@ -9,9 +9,24 @@ package cgobench
 /*
 static void empty() {
 }
+
+void go_empty_callback();
+
+static void callback() {
+	go_empty_callback();
+}
+
 */
 import "C"
 
 func Empty() {
 	C.empty()
 }
+
+func Callback() {
+	C.callback()
+}
+
+//export go_empty_callback
+func go_empty_callback() {
+}
-- 
2.52.0