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opt / golang / 1.19.4 / src / runtime / testdata / testprogcgo /

📁 ..
📄 aprof.go(1.14 KB)
📄 aprof_c.c(217 B)
📄 bigstack1_windows.c(379 B)
📄 bigstack_windows.c(1.2 KB)
📄 bigstack_windows.go(586 B)
📄 callback.go(1.4 KB)
📄 catchpanic.go(993 B)
📄 cgo.go(1.82 KB)
📄 crash.go(743 B)
📄 deadlock.go(509 B)
📄 dll_windows.go(459 B)
📄 dropm.go(1.05 KB)
📄 dropm_stub.go(336 B)
📄 eintr.go(5.17 KB)
📄 exec.go(2.1 KB)
📄 gprof.go(868 B)
📄 gprof_c.c(700 B)
📄 lockosthread.c(301 B)
📄 lockosthread.go(2.59 KB)
📄 main.go(651 B)
📄 needmdeadlock.go(1.83 KB)
📄 numgoroutine.go(1.92 KB)
📄 panic.c(239 B)
📄 panic.go(312 B)
📄 pprof.go(1.67 KB)
📄 pprof_callback.go(1.82 KB)
📄 raceprof.go(1.72 KB)
📄 racesig.go(1.94 KB)
📄 segv.go(839 B)
📄 sigpanic.go(484 B)
📄 sigstack.go(2.09 KB)
📄 sigthrow.go(312 B)
📄 stack_windows.go(987 B)
📄 threadpanic.go(428 B)
📄 threadpanic_unix.c(435 B)
📄 threadpanic_windows.c(435 B)
📄 threadpprof.go(2.54 KB)
📄 threadprof.go(2.34 KB)
📄 traceback.go(949 B)
📄 traceback_c.c(1.21 KB)
📄 tracebackctxt.go(2.85 KB)
📄 tracebackctxt_c.c(2.33 KB)
📁 windows

Editing: pprof_callback.go

// Copyright 2022 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

package main

// Make many C-to-Go callback while collecting a CPU profile.
//
// This is a regression test for issue 50936.

/*
#include <unistd.h>

void goCallbackPprof();

static void callGo() {
	// Spent >20us in C so this thread is eligible for sysmon to retake its
	// P.
	usleep(50);
	goCallbackPprof();
}
*/
import "C"

import (
	"fmt"
	"os"
	"runtime"
	"runtime/pprof"
	"time"
)

func init() {
	register("CgoPprofCallback", CgoPprofCallback)
}

//export goCallbackPprof
func goCallbackPprof() {
	// No-op. We want to stress the cgocall and cgocallback internals,
	// landing as many pprof signals there as possible.
}

func CgoPprofCallback() {
	// Issue 50936 was a crash in the SIGPROF handler when the signal
	// arrived during the exitsyscall following a cgocall(back) in dropg or
	// execute, when updating mp.curg.
	//
	// These are reachable only when exitsyscall finds no P available. Thus
	// we make C calls from significantly more Gs than there are available
	// Ps. Lots of runnable work combined with >20us spent in callGo makes
	// it possible for sysmon to retake Ps, forcing C calls to go down the
	// desired exitsyscall path.
	//
	// High GOMAXPROCS is used to increase opportunities for failure on
	// high CPU machines.
	const (
		P = 16
		G = 64
	)
	runtime.GOMAXPROCS(P)

f, err := os.CreateTemp("", "prof")
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(2)
	}
	defer f.Close()

if err := pprof.StartCPUProfile(f); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(2)
	}

for i := 0; i < G; i++ {
		go func() {
			for {
				C.callGo()
			}
		}()
	}

time.Sleep(time.Second)

pprof.StopCPUProfile()

fmt.Println("OK")
}

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Editing: pprof_callback.go

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