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// 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.
// +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
}
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