prometheus/vendor/github.com/petermattis/goid/goid.go

// Copyright 2016 Peter Mattis.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License. See the AUTHORS file
// for names of contributors.

package goid

import (
	"bytes"
	"runtime"
	"strconv"
)

func ExtractGID(s []byte) int64 {
	s = s[len("goroutine "):]
	s = s[:bytes.IndexByte(s, ' ')]
	gid, _ := strconv.ParseInt(string(s), 10, 64)
	return gid
}

// Parse the goid from runtime.Stack() output. Slow, but it works.
func getSlow() int64 {
	var buf [64]byte
	return ExtractGID(buf[:runtime.Stack(buf[:], false)])
}