let i = 0;
async function handler() {
    i++;
    console.log(new Date().getTime()/1000, '处理程序开始', i);
    await new Promise(resolve => setTimeout(resolve, 2000)); // 模拟异步操作
    console.log(new Date().getTime()/1000, '处理程序完成', i);
};

function call1() {
    handler();
    handler();
}
call1();

1732934781.962 处理程序开始 1
1732934781.966 处理程序开始 2
1732934783.969 处理程序完成 2
1732934783.97 处理程序完成 2

async function call2() {
    await handler();
    await handler();
}
call2();

1732934929.563 处理程序开始 1
1732934931.569 处理程序完成 1
1732934931.57 处理程序开始 2
1732934933.571 处理程序完成 2

let lastlock = Promise.resolve();
async function getlock() {
    let unlock = () => {};
    let lock = lastlock;
    let nlock = new Promise<void>((resolve) => {unlock = resolve;});
    lastlock = nlock;
    await lock;
    return unlock;
}

async function handler() {
    const unlock = await getlock();
    try  {
        i++;
        console.log(new Date().getTime()/1000, '处理程序开始', i);
        await new Promise(resolve => setTimeout(resolve, 2000)); // 模拟异步操作
        console.log(new Date().getTime()/1000, '处理程序完成', i);
    } finally {
        unlock();
    }
};

1732935948.492 处理程序开始 1
1732935950.497 处理程序完成 1
1732935950.497 处理程序开始 2
1732935952.499 处理程序完成 2

1732936175.165 处理程序开始 1
1732936177.171 处理程序完成 1
1732936177.171 处理程序开始 2
1732936179.173 处理程序完成 2

Type 类型
Value 值

类型 零值
string ""
int 0
float 0
bool false
数组(固定长度) 所有成员的零值
struct 所有成员的零值
slice nil
map nil
指针 nil
函数 nil
通道 nil
接口interface Type Value均为nil

package main

import "fmt"

func main() {
    type Man struct {
        name int
    }
    type Human interface {
        GetName() string
    }
    var (
        a string
        b int
        c float32
        d bool
        e [3]int
        f Man
        g []int
        h map[string]string
        i *int
        j func() int
        k chan int
        l Human
    )
    fmt.Printf("a=%#v b=%#v c=%#v d=%#v e=%#v f=%#v g=%#v h=%#v i=%#v j=%#v k=%#v l=%#v\n", a, b, c, d, e, f, g, h, i, j, k, l)

}

// a="" b=0 c=0 d=false e=[3]int{0, 0, 0} f=main.Man{name:0} g=[]int(nil) h=map[string]string(nil) i=(*int)(nil) j=(func() int)(nil) k=(chan int)(nil) l=<nil>

use xx_database;
show table status;

+-----------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
| Name            | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time         | Update_time | Check_time | Collation       | Checksum | Create_options | Comment |
+-----------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
| game         | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |            0 |   7340032 |              1 | 2014-11-13 15:18:13 | NULL        | NULL       | utf8_general_ci |     NULL |                |         |
| goods        | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |            0 |   7340032 |              1 | 2014-11-13 15:20:18 | NULL        | NULL       | utf8_general_ci |     NULL |                |         |

show full fields from xxx_table;

+------------+------------------+-----------------+------+-----+---------+----------------+---------------------------------+---------+
| Field      | Type             | Collation       | Null | Key | Default | Extra          | Privileges                      | Comment |
+------------+------------------+-----------------+------+-----+---------+----------------+---------------------------------+---------+
| id         | int(10) unsigned | NULL            | NO   | PRI | NULL    | auto_increment | select,insert,update,references |         |
| name       | varchar(200)     | utf8_general_ci | NO   |     | NULL    |                | select,insert,update,references |         |
| url        | varchar(1000)    | utf8_general_ci | NO   |     | NULL    |                | select,insert,update,references |         |
| created_at | int(10) unsigned | NULL            | NO   |     | NULL    |                | select,insert,update,references |         |
| updated_at | int(10) unsigned | NULL            | NO   |     | NULL    |                | select,insert,update,references |         |
+------------+------------------+-----------------+------+-----+---------+----------------+---------------------------------+---------+

apt-get install php5-sybase 

"Unicode data in a Unicode-only collation or ntext data cannot be sent to clients using DB-Library (such as ISQL) or ODBC version 3.7 or earlier."

[global]
;tds version = 4.2
tds version = 8.0
client charset = UTF-8

; Specify client character set..
; If empty or not set the client charset from freetds.comf is used
; This is only used when compiled with FreeTDS
mssql.charset = "UTF-8"

mssql.datetimeconvert = Off

vim /etc/network/interfaces

/**
 * PNG ALPHA CHANNEL SUPPORT for imagecopymerge();
 * This is a function like imagecopymerge but it handle alpha channel well!!!
 **/
function imagecopymerge_alpha($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct){
    $opacity=$pct;
    // getting the watermark width
    $w = imagesx($src_im);
    // getting the watermark height
    $h = imagesy($src_im);
    
    // creating a cut resource
    $cut = imagecreatetruecolor($src_w, $src_h);
    // copying that section of the background to the cut
    imagecopy($cut, $dst_im, 0, 0, $dst_x, $dst_y, $src_w, $src_h);
    // inverting the opacity
    $opacity = $opacity;
    
    // placing the watermark now
    imagecopy($cut, $src_im, 0, 0, $src_x, $src_y, $src_w, $src_h);
    imagecopymerge($dst_im, $cut, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $opacity);

package cn.asarea.app.testandroid;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;

public class MainActivity extends Activity {
    private static final String TAG = "test andriod";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        Log.e(TAG, Thread.currentThread().getStackTrace()[2].getMethodName());
    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        
//        StackTraceElement stackTraceElements[] =  Thread.currentThread().getStackTrace();
//        for (StackTraceElement stackTraceElement : stackTraceElements) {
//            Log.e(TAG, stackTraceElement.getClassName() + ":" + stackTraceElement.getMethodName());
//        }
        
        Log.e(TAG, Thread.currentThread().getStackTrace()[2].getMethodName());
    }

    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        super.onRestart();
        
        Log.e(TAG, Thread.currentThread().getStackTrace()[2].getMethodName());
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        
        Log.e(TAG, Thread.currentThread().getStackTrace()[2].getMethodName());
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        
        Log.e(TAG, Thread.currentThread().getStackTrace()[2].getMethodName());
    }

    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        
        Log.e(TAG, Thread.currentThread().getStackTrace()[2].getMethodName());
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        
        Log.e(TAG, Thread.currentThread().getStackTrace()[2].getMethodName());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

apt-get install git

#cd到你准备存放库的目录
git init --bare myproject.git
#这就会新建一个目录叫myproject.git，并且初始化了一个git库
#bare的意思就是不需要workspace，只要.git中的git信息内容

adduser git
#将创建的中心库改为git用户所有
chown -R git:git myproject.git
#禁止用putty等用git账号登陆
vim /etc/passwd
#将git:x:1001:1001:,,,:/home/git:/bin/bash改为
git:x:1001:1001:,,,:/home/git:/usr/bin/git-shell

ssh://git@xxx.net:222/mygitposition/myproject.git

#cd到你的workspace目录
git clone ssh://git@xxx.net:222/mygitposition/myproject.git
#工程会clone到myproject目录中

#author.txt是将svn的账号转化为git账号
#内容如：ather = Ather Shu <shushenghong@gmail.com>
git svn clone http://localhost/svn/repository/myproject --authors-file=author.txt --no-metadata
cd myproject
#将svn ignore转化为git ignore
#可以导出到exclude
git svn show-ignore > .git/info/exclude
#或者生成.gitignore文件
git svn create-ignore

git remote add origin ssh://git@xxx.net:222/mygitposition/myproject.git
git push origin master --tags