95 lines
2 KiB
Go
95 lines
2 KiB
Go
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build !plan9 && !windows
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// +build !plan9,!windows
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package main
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/*
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#include <stddef.h>
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#include <pthread.h>
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extern void CallbackNumGoroutine();
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static void* thread2(void* arg __attribute__ ((unused))) {
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CallbackNumGoroutine();
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return NULL;
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}
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static void CheckNumGoroutine() {
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pthread_t tid;
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pthread_create(&tid, NULL, thread2, NULL);
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pthread_join(tid, NULL);
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}
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*/
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import "C"
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import (
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"fmt"
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"runtime"
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"strings"
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)
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var baseGoroutines int
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func init() {
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register("NumGoroutine", NumGoroutine)
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}
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func NumGoroutine() {
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// Test that there are just the expected number of goroutines
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// running. Specifically, test that the spare M's goroutine
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// doesn't show up.
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if _, ok := checkNumGoroutine("first", 1+baseGoroutines); !ok {
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return
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}
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// Test that the goroutine for a callback from C appears.
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if C.CheckNumGoroutine(); !callbackok {
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return
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}
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// Make sure we're back to the initial goroutines.
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if _, ok := checkNumGoroutine("third", 1+baseGoroutines); !ok {
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return
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}
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fmt.Println("OK")
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}
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func checkNumGoroutine(label string, want int) (string, bool) {
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n := runtime.NumGoroutine()
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if n != want {
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fmt.Printf("%s NumGoroutine: want %d; got %d\n", label, want, n)
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return "", false
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}
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sbuf := make([]byte, 32<<10)
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sbuf = sbuf[:runtime.Stack(sbuf, true)]
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n = strings.Count(string(sbuf), "goroutine ")
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n -= strings.Count(string(sbuf), "goroutine in C code")
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if n != want {
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fmt.Printf("%s Stack: want %d; got %d:\n%s\n", label, want, n, string(sbuf))
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return "", false
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}
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return string(sbuf), true
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}
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var callbackok bool
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//export CallbackNumGoroutine
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func CallbackNumGoroutine() {
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stk, ok := checkNumGoroutine("second", 2+baseGoroutines)
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if !ok {
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return
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}
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if !strings.Contains(stk, "CallbackNumGoroutine") {
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fmt.Printf("missing CallbackNumGoroutine from stack:\n%s\n", stk)
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return
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}
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callbackok = true
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}
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