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Significance and use of do{...}while(0)
In some Linux kernel and other open source codes, we can see some codes like below: do{ ... }while(0) This code snippet is not a loop, it seems there is no significance of using do...while this way, then why should we use it? In fact, the significance of do{...}while(0) is better than optimizing your code. After some research, we summarize some benefits of it. 1. Help define complex macro to avoid error #define DOSOMETHING()\ foo1();\ foo2(); The me...
do{...}while(0), optimization 2012-10-21 21:13:22
About .NET memory leak--GC,Delegate and weak reference
Memory leak is always a headache for many programmers, the situation is much better now in some languages which have GC mechanism, but still we may face some memory leak issues when we write programs. 1. What is memory leak? Memory leak is not that the memory chip is broken. In short, it's about that the memory requested is not released at the expected time as an expect way. So what is the expected time? This is very important for you to understand memory leak. If the time an object taking the m...
.NET,GC,Reference counting,Mark and sweep,Weak reference 2013-05-25 12:59:09
Comparing Floating Point Numbers, 2012 Edition
We’ve finally reached the point in this series that I’ve been waiting for. In this post I am going to share the most crucial piece of floating-point math knowledge that I have. Here it is:[Floating-point] math is hard.You just won’t believe how vastly, hugely, mind-bogglingly hard it is. I mean, you may think it’s difficult to calculate when trains from Chicago and Los Angeles will collide, but that’s just peanuts to floating-point math.Seriously. Each ti...
Floating point number,Comparison,True value 2012-02-23 07:11:03
Go vs C benchmark. Could Go be faster than C?
During last semester I was attending Multiprocessor Architectures course, given at Facultad de Informática where I study my Computer Science degree. As part of the assignments due to pass the course, we had to do several programs written in C to benchmark matrix multiplication by testing different techniques and technologies. First of all we had to do a secuential program in three different versions: A normal one where the result matrix is ordered by rows and the loops range the matrix by ...
We’re working our young people too hard
Yesterday, I shared an anecdote involving a school I once attended with a list. This anecdote eventually became the basis for a blog post. Traffic was fairly normal for the first few hours until it found its way onto hackernews.Then it exploded.The comments on both the original blog post and the post on hackernews filled almost immediately with opinionated hackers, teachers and students sharing similar experiences, discussing the problem and figuring out what should be done about it.Repeate...
SQL Injection through HTTP Headers
During vulnerability assessment or penetration testing, identifying the input vectors of the target application is a primordial step. Sometimes, when dealing with Web application testing, verification routines related to SQL injection flaws discovery are restricted to the GET and POST variables as the unique inputs vectors ever. What about other HTTP header parameters? Aren’t they potential input vectors for SQL injection attacks? How can one test all these HTTP parameters and whic...
Code security,SQL injection,HTTP header 2012-04-05 11:42:04
How Can Anyone Still Hate Bill Gates
David Coursey from Forbes has a nice article on Gates titled - How Can Anyone Still Hate Bill Gates?There were a couple of line in Coursey's article that rang very true.All that money you think Gates stole from you? He’s giving it back, with interest, to the world’s poorest.All that money you think Apple has overcharged people? Apple still has it and Steve got and kept his share.Steve Jobs has fittingly had a long list of tributes. He was among the greatest technologists, busi...
Bill Gates,Steve Jobs,Glory,Competition,Good guy 2011-11-05 07:08:56
Java Interview Questions
Currently there are many articles online which summarize the list of Java interview questions. Some cover lots of basic questions and some cover some specific questions in specific area such as multithreading. In this post, we will not cover the really basic questions, we will cover something different. For basic question, you can read Java Interview Questions。 Basic What is primitive data type? How many primitive data types in Java? What are they? -- A primitive type is prede...
JAVA,SECURITY,INTERVIEW,CAREER,MULTITHREADING,QUESTION,JAVA INTERVIEW,JAVA CORE 2019-01-21 07:07:08
It’s Not China; It’s Efficiency That Is Killing Our Jobs
The majority of wealth is now concentrated at the top of the social ladder. This is particularly true in the US, and the gap is widening every year. This, I believe, is because of efficiency, not China. Today the best ideas can efficiently and quickly propagate worldwide, and everyone can efficiently find them and buy them. This makes the owners of these ideas filthy rich, and those ideas that are not the best, can hardly survive. It’s not just transfer of information that is fast; wealth...
China,Efficiency,Job,Opportunity,Wealth 2011-10-23 11:43:18
JavaScript Needs Blocks
While reading Hacker News posts about JavaScript, I often come across the misconception that Ruby’s blocks are essentially equivalent to JavaScript’s “first class functionsâ€. Because the ability to pass functions around, especially when you can create them anonymously, is extremely powerful, the fact that both JavaScript and Ruby have a mechanism to do so makes it natural to assume equivalence. In fact, when people talk about why Ruby’s blocks are different ...
JavaScript,Block,Style,Format,Maintainebility 2012-01-11 11:59:35
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