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https://github.com/golang/go
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fac8202c3f
[Repeat of CL 18343 with build fixes.]
Before, NumGoroutine counted system goroutines and Stack (usually) didn't show them,
which was inconsistent and confusing.
To resolve which way they should be consistent, it seems like
package main
import "runtime"
func main() { println(runtime.NumGoroutine()) }
should print 1 regardless of internal runtime details. Make it so.
Fixes #11706.
Change-Id: If26749fec06aa0ff84311f7941b88d140552e81d
Reviewed-on: https://go-review.googlesource.com/18432
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
125 lines
3.2 KiB
Go
125 lines
3.2 KiB
Go
// Copyright 2014 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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// Issue 7978. Stack tracing didn't work during cgo code after calling a Go
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// callback. Make sure GC works and the stack trace is correct.
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package cgotest
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/*
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#include <stdint.h>
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void issue7978cb(void);
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#if defined(__APPLE__) && defined(__arm__)
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// on Darwin/ARM, libSystem doesn't provide implementation of the __sync_fetch_and_add
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// primitive, and although gcc supports it, it doesn't inline its definition.
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// Clang could inline its definition, so we require clang on Darwin/ARM.
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#if defined(__clang__)
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#define HAS_SYNC_FETCH_AND_ADD 1
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#else
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#define HAS_SYNC_FETCH_AND_ADD 0
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#endif
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#else
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#define HAS_SYNC_FETCH_AND_ADD 1
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#endif
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// use ugly atomic variable sync since that doesn't require calling back into
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// Go code or OS dependencies
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static void issue7978c(uint32_t *sync) {
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#if HAS_SYNC_FETCH_AND_ADD
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while(__sync_fetch_and_add(sync, 0) != 0)
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;
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__sync_fetch_and_add(sync, 1);
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while(__sync_fetch_and_add(sync, 0) != 2)
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;
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issue7978cb();
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__sync_fetch_and_add(sync, 1);
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while(__sync_fetch_and_add(sync, 0) != 6)
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;
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#endif
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}
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*/
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import "C"
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import (
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"os"
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"runtime"
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"strings"
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"sync/atomic"
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"testing"
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)
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var issue7978sync uint32
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func issue7978check(t *testing.T, wantFunc string, badFunc string, depth int) {
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runtime.GC()
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buf := make([]byte, 65536)
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trace := string(buf[:runtime.Stack(buf, true)])
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for _, goroutine := range strings.Split(trace, "\n\n") {
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if strings.Contains(goroutine, "test.issue7978go") {
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trace := strings.Split(goroutine, "\n")
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// look for the expected function in the stack
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for i := 0; i < depth; i++ {
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if badFunc != "" && strings.Contains(trace[1+2*i], badFunc) {
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t.Errorf("bad stack: found %s in the stack:\n%s", badFunc, goroutine)
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return
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}
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if strings.Contains(trace[1+2*i], wantFunc) {
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return
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}
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}
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t.Errorf("bad stack: didn't find %s in the stack:\n%s", wantFunc, goroutine)
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return
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}
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}
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t.Errorf("bad stack: goroutine not found. Full stack dump:\n%s", trace)
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}
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func issue7978wait(store uint32, wait uint32) {
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if store != 0 {
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atomic.StoreUint32(&issue7978sync, store)
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}
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for atomic.LoadUint32(&issue7978sync) != wait {
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runtime.Gosched()
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}
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}
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//export issue7978cb
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func issue7978cb() {
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issue7978wait(3, 4)
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}
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func issue7978go() {
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C.issue7978c((*C.uint32_t)(&issue7978sync))
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issue7978wait(7, 8)
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}
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func test7978(t *testing.T) {
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if runtime.Compiler == "gccgo" {
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t.Skip("gccgo can not do stack traces of C code")
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}
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if C.HAS_SYNC_FETCH_AND_ADD == 0 {
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t.Skip("clang required for __sync_fetch_and_add support on darwin/arm")
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}
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if os.Getenv("GOTRACEBACK") != "2" {
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t.Fatalf("GOTRACEBACK must be 2")
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}
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issue7978sync = 0
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go issue7978go()
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// test in c code, before callback
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issue7978wait(0, 1)
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issue7978check(t, "_Cfunc_issue7978c(", "", 1)
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// test in go code, during callback
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issue7978wait(2, 3)
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issue7978check(t, "test.issue7978cb(", "test.issue7978go", 3)
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// test in c code, after callback
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issue7978wait(4, 5)
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issue7978check(t, "_Cfunc_issue7978c(", "_cgoexpwrap", 1)
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// test in go code, after return from cgo
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issue7978wait(6, 7)
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issue7978check(t, "test.issue7978go(", "", 3)
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atomic.StoreUint32(&issue7978sync, 8)
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}
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