java lock-free concurrency

Is the ratio of lock-free and locked in the following code better? I use jmeter to make 20 requests per second. Most of the output of the sleep operation in test() of the lock-free code is very different from 500 milliseconds, while the output of the locked code is basically 500 milliseconds with a ...

我想大声告诉你 2017-05-17 10:01:02 0  1  744

mysql - Why does the database need a lock mechanism?

Why does the database need a lock mechanism? Can you give a detailed example using code? Thank you!

曾经蜡笔没有小新 2017-05-18 10:54:59 0  3  749

Unable to log in to personal center on mobile phone

I cannot log in to the personal center on the mobile webpage. The mobile phone card is mobile, but it prompts that non-China Unicom and Telecom mobile phone numbers are not allowed to be used. I don’t know what the problem is and whether there is any official person to solve it.

做自己的小太阳 2021-07-16 22:00:43 0  2  1793

virtualbox - Redis使能密码后Ubuntu虚拟机无法正常关机

我一直在虚拟机中开发自己的服务器程序。 VirtualBox V5 Ubuntu Server 12.04LTS 32bit Python 2.7.3 MySQL 5.5 Redis Redis缺省是没有密码的，我使能密码后，发现虚拟机无法正常关机。关机时Redis报告脚本密码错...

阿神 2017-04-25 09:02:50 0  3  1038

MutationObserver not working properly on localhost

TL;DR: For some reason, the MutationObserver doesn't fire at all on my page. The same console snippet works on other pages, but not when run on my localhost. I'm working on a standard reactSPA built with webpack and running on localhost. Now I'm trying to use https://github.com/KingSora/OverlayScrol...

P粉894008490 2023-08-31 21:38:41 0  1  603

laravel - nginx+php7 configuration virtual host cannot be accessed

The nginx+php7 configured virtual host cannot access my laravel project, and the access page keeps reporting a 500 error code. My configuration: {code...}

伊谢尔伦 2017-05-16 16:51:52 0  2  642

angular.js - directive custom directive mobile debugging has no effect

directive custom instructions have no effect on mobile phone debugging<div nx-form nx-fields="view.fields" nx-values="view.defaultValue" nx-methods="methods"></div> chrome has an effect Yes, but after packaging it and putting it on the mobile...

大家讲道理 2017-05-15 17:03:16 0  1  516

centos - virtualbox虚拟机无界面运行 windows7 不行吗？

母鸡CentOS 7 64位DVD版本，rpm安装了virtualbox虚拟机。新建了两个虚拟机，一个名为windows7，一个名为centos7minimal。图形界面下开机关机一切正常，但是在无界面或没打开virtualbox窗口时，启动windows7失败，...

淡淡烟草味 2017-04-25 09:03:19 0  2  984

When setting up a virtual machine in the environment, it shows that the virtual computer cannot be opened.

When setting up a virtual machine in the environment, it shows that the virtual computer cannot be opened.

終,_____點 2020-03-20 22:36:39 0  0  1241

如何解决docker宿主机无法访问容器中的服务？

1、在容器中访问容器中的服务有响应,在宿主机访问容器服务无响应，但是宿主机可以访问到容器nginx服务的欢迎界面，截图如下： 在容器中访问容器中的服务有响应： {代码...} 在宿主机访问容器中的服务无响应： {代...

PHP中文网 2017-04-27 09:03:17 0  2  1019

Why can't the database be operated normally when uploaded to a virtual host?

Why can’t the database be operated normally when uploaded to a virtual host?

笑该动人 2018-07-31 16:51:55 0  1  1186

php artisan serve 报错 'Fatal Error Unable to create lock file: No such file or directory'。

When I run the following command on AlmaLinux 8 as a user, I encounter a fatal error. I just installed a simple Laravel project from the internet using a simple command in the user's home directory. bash-4.4$ php artisan serve Warning: Mon Jul 17 01:26:11 2023 (115): Fatal error: Unable to create ...

P粉252423906 2023-07-17 18:42:09 0  1  648

Regarding the disabling of the sorting function and menu in system management is invalid

Regarding the sorting function and menu disabling function in system management, is it invalid? Did the teacher forget to write it, or is there something wrong with my code?

 2018-12-28 14:54:54 0  2  1285

c++ - VS2013 debug mode opencv cannot open local images

Problem: VS2013community+opencv2.4.13.x86 cannot open local images in debugging mode, prompting an error: But entering the debugging directory and running the generated exe file directly can run the program code: {code...}

怪我咯 2017-05-16 13:26:41 0  1  692

I found that if phpstudy is not connected to the Internet, the program cannot be started.

I found that if the phpstudy program cannot be started on a machine that is not connected to the Internet, do you have any solutions? Thank you

阳光 2018-07-12 09:50:17 0  4  1322

PHPMailer: SMTP error: Unable to connect to SMTP host

I've used PHPMailer on several projects but now I'm stuck. It gave me the error: SMTP Error: Unable to connect to SMTP host. I've tried sending email from Thunderbird and it works! But not through PHPMailer... Here are the settings for Thunderbird: Server Name: mail.exampleserver.com Port: 587 Usern...

P粉990008428 2023-10-12 21:00:22 0  1  789

Why can't I slide down or click on the website when accessing it through a mobile phone?

My personal website cannot be scrolled down or clicked when accessed through a mobile phone. What's going on? What codes need to be modified and deleted? Website: http://t.iaozi.com

**推广网 2018-04-13 17:48:39 0  2  2037

Efficient ways to resolve cURL Error (7): Unable to connect to host

I'm using cUrl (php) to send a project code to a web service in xml format. On localhost I get the correct response, but when executed on the server it shows: cURL Error (7): Unable to connect to host Here is my code: functionxml_post($post_xml,$url){$user_agent =$_SERVER['HTTP_USER_AGENT'];$ch=curl...

P粉674999420 2023-08-20 16:21:20 0  1  774

CentOS6中安装gogs就是无法开机自动启动，求助？

我在centos6中安装了gogs，手动可以启动，启动命令为：service gogs start，启动后可以正常访问，但是就是死活无法配置为开机自动启动，chkconfig gogs on也执行过. {代码...} 也尝试过在/etc/rc.d/rc.local里面...

天蓬老师 2017-04-25 09:03:57 0  0  655

After adding a virtual host to the local PHP toolbox and binding the domain name, the LAN computer cannot access it.

I would like to ask why, after adding a virtual host to the local PHP toolbox and binding the virtual domain name, the domain name can only be accessed locally, and other computers in the LAN cannot access it through the domain name. But if the domain name is changed to IP binding mode, the local co...

Jackie 2019-03-11 14:31:04 0  4  1411