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✏️ tors.go

// Copyright 2018 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.

package main

import (
	"bytes"
	"fmt"
	"runtime"
	"strings"
)

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

const numGoroutines = 3
const numFrames = 2

func TracebackAncestors() {
	w := make(chan struct{})
	recurseThenCallGo(w, numGoroutines, numFrames, true)
	<-w
	printStack()
	close(w)
}

var ignoreGoroutines = make(map[string]bool)

func printStack() {
	buf := make([]byte, 1024)
	for {
		n := runtime.Stack(buf, true)
		if n < len(buf) {
			all := string(buf[:n])
			var saved string

// Delete any ignored goroutines, if present.
			for all != "" {
				var g string
				g, all, _ = strings.Cut(all, "\n\n")

if strings.HasPrefix(g, "goroutine ") {
					id, _, _ := strings.Cut(strings.TrimPrefix(g, "goroutine "), " ")
					if ignoreGoroutines[id] {
						continue
					}
				}
				if saved != "" {
					saved += "\n\n"
				}
				saved += g
			}

fmt.Print(saved)
			return
		}
		buf = make([]byte, 2*len(buf))
	}
}

func recurseThenCallGo(w chan struct{}, frames int, goroutines int, main bool) {
	if frames == 0 {
		// Signal to TracebackAncestors that we are done recursing and starting goroutines.
		w <- struct{}{}
		<-w
		return
	}
	if goroutines == 0 {
		// Record which goroutine this is so we can ignore it
		// in the traceback if it hasn't finished exiting by
		// the time we printStack.
		if !main {
			ignoreGoroutines[goroutineID()] = true
		}

// Start the next goroutine now that there are no more recursions left
		// for this current goroutine.
		go recurseThenCallGo(w, frames-1, numFrames, false)
		return
	}
	recurseThenCallGo(w, frames, goroutines-1, main)
}

func goroutineID() string {
	buf := make([]byte, 128)
	runtime.Stack(buf, false)
	prefix := []byte("goroutine ")
	var found bool
	if buf, found = bytes.CutPrefix(buf, prefix); !found {
		panic(fmt.Sprintf("expected %q at beginning of traceback:\n%s", prefix, buf))
	}
	id, _, _ := bytes.Cut(buf, []byte(" "))
	return string(id)
}

Batal

⬅ testdata 32 item

Nama	Tipe	Ukuran	Diubah	Aksi
🔵abort.go	go	449 B	2024-02-02 18:09	✏️ 👁️
🔵badtraceback.go	go	1.2 KB	2024-02-02 18:09	✏️ 👁️
🔵checkptr.go	go	2.4 KB	2024-02-02 18:09	✏️ 👁️
🔵crash.go	go	2.5 KB	2024-02-02 18:09	✏️ 👁️
🔵crashdump.go	go	917 B	2024-02-02 18:09	✏️ 👁️
🔵deadlock.go	go	6.5 KB	2024-02-02 18:09	✏️ 👁️
🔵framepointer.go	go	839 B	2024-02-02 18:09	✏️ 👁️
📄framepointer_amd64.s	s	248 B	2024-02-02 18:09	✏️ 👁️
📄framepointer_arm64.s	s	249 B	2024-02-02 18:09	✏️ 👁️
🔵gc.go	go	12.1 KB	2024-02-02 18:09	✏️ 👁️
🔵lockosthread.go	go	6.5 KB	2024-02-02 18:09	✏️ 👁️
🔵main.go	go	651 B	2024-02-02 18:09	✏️ 👁️
🔵map.go	go	1.3 KB	2024-02-02 18:09	✏️ 👁️
🔵memprof.go	go	869 B	2024-02-02 18:09	✏️ 👁️
🔵misc.go	go	306 B	2024-02-02 18:09	✏️ 👁️
🔵numcpu_freebsd.go	go	3.4 KB	2024-02-02 18:09	✏️ 👁️
🔵panicprint.go	go	2.2 KB	2024-02-02 18:09	✏️ 👁️
🔵panicrace.go	go	414 B	2024-02-02 18:09	✏️ 👁️
🔵preempt.go	go	1.6 KB	2024-02-02 18:09	✏️ 👁️
🔵segv.go	go	479 B	2024-02-02 18:09	✏️ 👁️
🔵segv_linux.go	go	517 B	2024-02-02 18:09	✏️ 👁️
🔵signal.go	go	861 B	2024-02-02 18:09	✏️ 👁️
🔵sleep.go	go	378 B	2024-02-02 18:09	✏️ 👁️
🔵stringconcat.go	go	443 B	2024-02-02 18:09	✏️ 👁️
🔵syscall_windows.go	go	1.5 KB	2024-02-02 18:09	✏️ 👁️
🔵syscalls.go	go	256 B	2024-02-02 18:09	✏️ 👁️
🔵syscalls_linux.go	go	1.2 KB	2024-02-02 18:09	✏️ 👁️
🔵syscalls_none.go	go	455 B	2024-02-02 18:09	✏️ 👁️
🔵timeprof.go	go	813 B	2024-02-02 18:09	✏️ 👁️
🔵traceback_ancestors.go	go	2.1 KB	2024-02-02 18:09	✏️ 👁️
🔵unsafe.go	go	195 B	2024-02-02 18:09	✏️ 👁️
🔵vdso.go	go	1005 B	2024-02-02 18:09	✏️ 👁️

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