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  Practice of using spinlock instead of mutex

Spinlock and mutex are two important concepts in multithreading programs. They are used to lock some shared resource to prevent concurrent access which may affect data consistency. But they do have differences, what are the differences? when should we use spinlock instead of mutex? The Theory In theory, when a thread tries to lock a mutex and it does not succeed, because the mutex is already locked, it will go to sleep, immediately allowing another thread to run. It will continue to sleep until...

   Spinlock,Mutex,Concurrency     2014-04-19 21:54:12

  Build Hadoop environment in Linux

Hadoop standalone installation: 1. Install JDK Install JDK with below command: sudo apt-get install sun-java6-jdk Configure Java environment, open /etc/profile, add below contents: export JAVA_HOME = （Java installation directory） export CLASSPATH =".:$JAVA_HOME/lib:$CLASSPATH" export PATH = "$JAVA_HOME/:PATH" Verify installation of Java Type java --version, if it outputs Java version information, then Java is successfully installed. 2. Install SSH Install SSH with below command: sudo ...

   Hadoop.Linux,Configuration     2013-07-31 23:22:27

  How To Find Link Prospects Without Using Google

I’m obsessed with Google. (I mean, you kind of have to be if you’re in this industry.) But sometimes, you need a break from the hand that feeds. There’s no denying the power of advanced search queries, but you’d be surprised how many other and different prospects you can find without using the search engine at all. Curated Lists OK, I lied. You do have to use Google for this, but not nearly in the capacity you would with normal searches. With lists, you have less ...

   Search engine,Web site prospect,SEO     2012-02-25 12:02:50

  Apple.com is down

UPDATE : The service is back now! Apple.com is now inaccessible. It shows below "Access denied" message on its official site. It is still unknown why the service is down. And there is no ETA on when the service will be back to normal. From the error message, some people think this happens because Apple uses Akamai's security product and the security policy in place is violated. It's basically a WAF. The big issue is it takes 45 minutes for changes to propagate through Akamai's network. So, you ...

   IPHONE 6S,IPHONE 6S PLUS,APPLE     2015-09-12 00:50:17

  Necessary Elements for Developing a Website

Website has given businesses a great way to communicate with their existing customers. Without a user-friendly and attractive website, you may not receive as many customers as you may have expected prior launching your website. Therefore, it is usually advisable to outsource your web development services to one of the best web development companies in Singapore. Web development services in Singapore ensures proper development of your website without missing out on any important element. These a...

   WEB DEVELOPMENT SERVICES IN SINGAPORE     2015-09-30 07:07:27

  Top 8 website operation laws

As a website operator, in addition to have some necessary professional knowledge to master a website, such as prototype planning, interaction design, SEO, as well as basic html code, you should also know more about some of the theories which are good for site operations to ensure that the site can be long-term, stable. 1. Law of 250 Girard thinks every person knows at least 250 people. If you win the goodwill of a customer, it means you win the goodwill of 250 individuals; Conversely, if you off...

   Website management,Rules     2012-09-13 20:55:50

  Different types of font icons

A website with just text belongs to the pre Web 2.0 era. A modern site will have different icons appearing on different places on the site. This will give the visitor a better visual feeling. But to have a set of consistent and well crafted icons is not an easy task. It may even require a dedicated icon designer to design them. Fortunately, we now can use font icons provided by many people around the web. Today we will introduce some of them. Font Awesome Font Awesome is an open source font ico...

   font icon, web design, font awesome     2015-07-19 06:22:48

  Some hidden XSS injection vulnerabilities

XSS injection refers to a Web page generates some unexpected executable js codes based on user input  and these executable codes are executed by web browser,i.e, the source code sent to web browser by the server contains some illegal js codes, and these illegal js codes are related to user's input. Common XSS injection vulnerabilities can be fixed with some functions such as htmlspecialchars(escaping HTML special characters) and strip_tags() or similar, but there are some hidden XSS injecti...

   XSS,PHP,Security,Code,JavaScript     2012-08-27 20:32:08

  30 minutes to fix Java vulnerability

On September 25, Adam Gowdiak from the Polish security consulting firm Security Explorations submitted a Java security vulnerability to Oracle and provided a proof-of-concept. The vulnerability exists in Java 5 6,7, once the user accesses hosted malware site, an attacker can remotely control the infected machine.Gowdiak later got in touch again with Oracle and got the response that the fix has reached the final stage. He can expect the patch in four months later. He eventually unbearable Oracle'...

   Java, Vulnerability,Fix     2012-10-29 11:53:43

  Instagram has more than 100 million users

On TechCrunch Disrupt, Facebook CEO Mark Zuckerberg said that Instagram users is over $100 million.According to comScore data, Instagram traffic in July rose 38%, it becomes the 56th site in United States. And Instagram official said that the number of users was 80 million and over four billion photos uploaded to the server in July.Last week, Facebook formally completed the acquisition of Instagram, the final cost is $735 million. Zuckerberg says he wants to help the growth of the application, ...

   Facebook,Instagram,Users     2012-09-11 19:50:57

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