changkun

package main

import (
	"encoding/json"
	"fmt"
	"runtime"
	"time"
)

type Monitor struct {

changkun

func Socketpair() (net.Conn, net.Conn, error) {
       fds, err := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM, 0)
       if err != nil {
               return nil, nil, err
       }

       c1, err := fdToFileConn(fds[0])
       if err != nil {
               return nil, nil, err
       }

changkun

package main

import (
	"log"
	"math/rand"
	"time"
)

const (
	size  = 1000

changkun

package main

/*
#cgo CFLAGS: -I/usr/local/include/pango-1.0
#cgo CFLAGS: -I/usr/local/include/glib-2.0
#cgo CFLAGS: -I/usr/local/include/cairo
#cgo LDFLAGS: -L/usr/local/lib -lpangocairo-1.0 -lpango-1.0 -lcairo -lgobject-2.0 -lglib-2.0
#include <pango/pangocairo.h>
#include <stdio.h>
#include <pthread.h>

changkun

// stacklog2 returns ⌊log_2(n)⌋.
func stacklog2(n uintptr) int {
	log2 := 0
	for n > 1 {
		n >>= 1
		log2++
	}
	return log2
}

changkun

Go (Golang) GOOS and GOARCH

All of the following information is based on go version go1.8.3 darwin/amd64.

A list of valid GOOS values

(Bold = supported by go out of the box, ie. without the help of a C compiler, etc.)

• android
• darwin

changkun

FILENAME=$(basename $(pwd))
go test -run=. -bench=. -cpuprofile=cpu.out -benchmem -memprofile=mem.out -trace trace.out
go tool pprof -pdf $FILENAME.test cpu.out > cpu.pdf && open cpu.pdf
go tool pprof -pdf --alloc_space $FILENAME.test mem.out > alloc_space.pdf && open alloc_space.pdf
go tool pprof -pdf --alloc_objects $FILENAME.test mem.out > alloc_objects.pdf && open alloc_objects.pdf
go tool pprof -pdf --inuse_space $FILENAME.test mem.out > inuse_space.pdf && open inuse_space.pdf
go tool pprof -pdf --inuse_objects $FILENAME.test mem.out > inuse_objects.pdf && open inuse_objects.pdf
go tool trace trace.out

go-torch $FILENAME.test cpu.out -f ${FILENAME}_cpu.svg && open ${FILENAME}_cpu.svg

changkun

#!/usr/bin/perl -w

use strict;
use warnings;

# 单行注释
print('Hello, 
    $world!\n');
my $world = "world";
print "Hello, 

changkun

https://github.com/golang/go/issues/7560
https://github.com/golang/go/commit/2d1a9510edc59cad463029fdc8ac93e62247baad
https://dave.cheney.net/2015/10/09/padding-is-hard

changkun

docker rm $(docker ps -a -q)