I need to use an atomic variable in C as this variable is accessed across different threads. Don’t want a race condition. My code is running on CentOS. What are my options? Answer If you are using GCC on your CentOS platform, then you can use the __atomic built-in functions. Of particular interest might…
System commands in c#
Does C# have an equivalent to the system command in C? for example, how would I do this in c#?. I’m using Mono on Linux. Answer No problem I got it. Tested and working on Ubuntu 13.10
free(): invalid pointer; ld terminated with signal 6 [Aborted], core dumped
Error Currently using this to compile my C++ program: I am using Mingw to compile my C++ program from Linux (Ubuntu) to a Windows executable. I am relatively new to compiling via command line, but I would like to switch my work environment completely over to Linux. When I attempt to compile the program, I get…
Determining if ephemeral storage is attached to an instance in Amazon Web Services console?
Short question: How do I know if an instance has ephemeral storage attached? Do I have to ssh in and look at the mounts with lsblk on Linux? Since ephemeral storage is lost when an instance is stopped, you need to know if ephemeral drives are attached at all. The first thing to check is the “root device…
Variable reset after scanf
I wrote the below function : I print the currentPlayer on any level to see what’s going on -> here what I get: Why the current player is 0 after scanf? I didn’t touch it. Answer The buffer location has only room for 2 characters and scanf puts an extra NUL character at end. Therefore you have a…
Completely remove Qt environment?
How to completely remove Qt environment? I installed Qt Creator Integrated Development from the Ubuntu Software Center,then I compiled and installed Qt 4.8.6 .There were few errors when I try to compile an Application. I Uninstalled / Removed via the Ubuntu Software Center. But when I tried to install QT 5.3 …
Basler Pylon 4 SDK and OPENCV 2.4.8, Linux simple viewer
I am developing a simple camera viewer to test Basler camera acA1300-30gc. I am working in Ubuntu 14.04 with Basler Pylon 4 and OPENCV version 2.4.8 because I am going to develop a machine vision application and I need to analyze frames on the fly. Based on OpenCV Display Image Tutorial, Sample Code in Pylon …
How to count the number of black and white pixels (linux, imagemagik, etc)
I have black and white images (see below). How count white and black pixels (as example 30% black and 70% white, or 123456 black pixels and 39393 white pixels)? p.s. I work in linux, what i must use? imagemagick? i prefer a command line interface program. Answer You can use ImageMagick’s histogram funct…
How to deploy Qt5 application on Linux in compliance with LGPL? [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. This question does not appear to be about programming within the scope defined in the help center. Closed 7 years ago. Improve this question Recently, I have successfully migrated my Qt4 application to Qt5. I…
SSH – Entering a Passphrase Only Once
On $ ssh localhost, I was being asked to provide password. It was tedious and kind of annoying to provide password for every login. So, I have created ssh keys with passphrase.. I have copied the content of the ~/.ssh/id_rsa.pub to ~/.ssh/authorized_keys Now, on $ ssh localhost I was being asked to provide pa…