1 files changed, 93 insertions, 0 deletions
diff --git a/src/runtime/testdata/testprogcgo/numgoroutine.go b/src/runtime/testdata/testprogcgo/numgoroutine.go
new file mode 100644
index 0000000..1b9f202
--- /dev/null
+++ b/src/runtime/testdata/testprogcgo/numgoroutine.go
@@ -0,0 +1,93 @@
+// Copyright 2017 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.
+
+//go:build !plan9 && !windows
+// +build !plan9,!windows
+
+package main
+
+/*
+#include <stddef.h>
+#include <pthread.h>
+
+extern void CallbackNumGoroutine();
+
+static void* thread2(void* arg __attribute__ ((unused))) {
+	CallbackNumGoroutine();
+	return NULL;
+}
+
+static void CheckNumGoroutine() {
+	pthread_t tid;
+	pthread_create(&tid, NULL, thread2, NULL);
+	pthread_join(tid, NULL);
+}
+*/
+import "C"
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+)
+
+var baseGoroutines int
+
+func init() {
+	register("NumGoroutine", NumGoroutine)
+}
+
+func NumGoroutine() {
+	// Test that there are just the expected number of goroutines
+	// running. Specifically, test that the spare M's goroutine
+	// doesn't show up.
+	if _, ok := checkNumGoroutine("first", 1+baseGoroutines); !ok {
+		return
+	}
+
+	// Test that the goroutine for a callback from C appears.
+	if C.CheckNumGoroutine(); !callbackok {
+		return
+	}
+
+	// Make sure we're back to the initial goroutines.
+	if _, ok := checkNumGoroutine("third", 1+baseGoroutines); !ok {
+		return
+	}
+
+	fmt.Println("OK")
+}
+
+func checkNumGoroutine(label string, want int) (string, bool) {
+	n := runtime.NumGoroutine()
+	if n != want {
+		fmt.Printf("%s NumGoroutine: want %d; got %d\n", label, want, n)
+		return "", false
+	}
+
+	sbuf := make([]byte, 32<<10)
+	sbuf = sbuf[:runtime.Stack(sbuf, true)]
+	n = strings.Count(string(sbuf), "goroutine ")
+	if n != want {
+		fmt.Printf("%s Stack: want %d; got %d:\n%s\n", label, want, n, string(sbuf))
+		return "", false
+	}
+	return string(sbuf), true
+}
+
+var callbackok bool
+
+//export CallbackNumGoroutine
+func CallbackNumGoroutine() {
+	stk, ok := checkNumGoroutine("second", 2+baseGoroutines)
+	if !ok {
+		return
+	}
+	if !strings.Contains(stk, "CallbackNumGoroutine") {
+		fmt.Printf("missing CallbackNumGoroutine from stack:\n%s\n", stk)
+		return
+	}
+
+	callbackok = true
+}