1 files changed, 80 insertions, 0 deletions
diff --git a/src/internal/trace/v2/testdata/testprog/cgo-callback.go b/src/internal/trace/v2/testdata/testprog/cgo-callback.go
new file mode 100644
index 0000000..d636500
--- /dev/null
+++ b/src/internal/trace/v2/testdata/testprog/cgo-callback.go
@@ -0,0 +1,80 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Tests CPU profiling.
+
+//go:build ignore
+
+package main
+
+/*
+#include <pthread.h>
+
+void go_callback();
+void go_callback2();
+
+static void *thr(void *arg) {
+    go_callback();
+    return 0;
+}
+
+static void foo() {
+    pthread_t th;
+    pthread_attr_t attr;
+    pthread_attr_init(&attr);
+    pthread_attr_setstacksize(&attr, 256 << 10);
+    pthread_create(&th, &attr, thr, 0);
+    pthread_join(th, 0);
+}
+
+static void bar() {
+    go_callback2();
+}
+*/
+import "C"
+
+import (
+	"log"
+	"os"
+	"runtime"
+	"runtime/trace"
+)
+
+//export go_callback
+func go_callback() {
+	// Do another call into C, just to test that path too.
+	C.bar()
+}
+
+//export go_callback2
+func go_callback2() {
+	runtime.GC()
+}
+
+func main() {
+	// Start tracing.
+	if err := trace.Start(os.Stdout); err != nil {
+		log.Fatalf("failed to start tracing: %v", err)
+	}
+
+	// Do a whole bunch of cgocallbacks.
+	const n = 10
+	done := make(chan bool)
+	for i := 0; i < n; i++ {
+		go func() {
+			C.foo()
+			done <- true
+		}()
+	}
+	for i := 0; i < n; i++ {
+		<-done
+	}
+
+	// Do something to steal back any Ps from the Ms, just
+	// for coverage.
+	runtime.GC()
+
+	// End of traced execution.
+	trace.Stop()
+}