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Direct IO in Python
Doing file I/O of any kind in Python is really easy. You can start with plain open() and friends, working with Python’s file objects. by the way, Python’s open() resembles C‘s fopen() so closely that I...
View ArticleRecursively deleting symbolic link and what it points to
Recently I looked for a solution to this little problem. how do you, programmatically, delete a symbolic link and a file that it points to? One problem that you should take care of when tackling this...
View ArticleHow less processes its input
Here’s an interesting bit I ran into few days ago. I got curious how is that less (or more) can read file contents from standard input and yet it is able to process input that comes from user. Both of...
View ArticleCall a constructor or allocate an object in-place
Since I joined Dell, my main field of research and work has somewhat changed. Now I am mostly working with C++ and file-systems. This world is not entirely new to me, but apparently I have a lot of...
View Articlepthread_exit() in C++
Today I ran into an interesting problem that I would like to share. I am working on multi-threaded code in C++. Here’s what happened. I started a thread that looks like this: try { do_something() }...
View ArticlePython for bash replacement
When I started learning Python, I was looking for a programming language that would replace BASH, AWK and SED. I am a C/C++ programmer and as such I better invest my time into studying C and C++....
View ArticleModels for multithreaded applications
As you know, I changed a couple of workplaces during my career. Long story short, one interesting thing that I noticed in different companies is various models for multi-threaded programs (mostly for...
View ArticleMaking writes durable – is your data on disk?
Here is an interesting article written by Evan Jones. The article explains how you can be guaranteed when your data is on disk. In case you’re wondering, when write(), fwrite() or any other library...
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UML cheatsheet
Every once in awhile, I have to draw a UML diagram. I rarely do serious designs with UML, however sometimes I do need to depict some piece of code in a diagram and UML seems to be the best notation...
View Articleprintf() vs stream IO in C++
Before joining Dell I was mostly working in kernel writing in C programming language. At Dell I still work on mostly low level stuff, but this time it is user-mode, so I am not tied up to C anymore....
View ArticleWhy you need a mutex to protect an int
This is a follow up on my previous post about need to protect access to even simplest variables when working in multi-threaded environment. In this post I would like to explain what’s going on under...
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