If vruntime is counted since creation of a process how come such a process even gets a processor if it is competing with a newly created processor-bound process which is younger let say by days? As I’ve read the rule is simple: pick the leftmost leaf which is a process with the lowest runtime. Thanks! A…
Tag: linux
How would a Python script running on Linux call a routine in a Python script running under Wine?
I have a Python (3) script running on Linux, referred to as the main script, which has to call a routine from a proprietary DLL. So far, I have solved this with Wine using the following construct: The script dll_call.py is executed by a Windows Python (3) interpreter installed under Wine. It dumps the return …
Python Wlan Manager
Is there a way in python to check whether a Wlan router is accessible? Something like I give as input the SSID and the password and get as response if it has worked or not? Answer Check out the wireless library.
Limit Qlistview to 1 selected item at most
I try to compel the program to select the 1st item(and only it) in the QListview if user’s selection is more 1 and includes the 1st item. The selectionMode flag is multiselection, which means user can select several items in the listview. Below is my code: in the constructor: But this code does not work…
How do we compile kernel code in C?
I am new to C and Linux. I am trying to compile the below code but it gives some fatal error while compiling. Any help on fixing this appreciated. Here is the code measurecpu.c: I am trying to compile it this way: I get this error: Answer I am trying to compile it this way gcc -c -O2 -W -Wall
bash script version of forfiles
I’m currently converting a DOS batch script to a shell script and while I have 99% of it working, one part I cannot figure out how to convert over. In the batch file, I have a line that looks like How would I write that for a shell script? Answer Try this, this will delete files without prompting To be
Linux scheduling. (pthreads)
I’m trying to play around with threads and so far, with the code below, I’m doing fine. I want also want to print the current index of the executing thread but I’ve encountered some problems. I’m trying to print the current executing thread along with “Hello world!”. But, t…
How do I configure QT5 without Xlib
I am trying to configure (and build) QT5 static. I want it to draw to the framebuffer and use webkit. I searched the docs but I didn’t find anything on how I can do this without X. Does anyone know a way of doing this ? Answer Building Qt statically is totally orthogonal to the platform selection. Depen…
Get/Set the pthread scheduling policy in Linux
The code below is a sample provided by the book in my Operating Systems course. When compiling it I get the error shown below it. I compiled it using this command… However, I get this error. I tried adding -pthread: but the error remains. Thanks for your help! Answer You have the correct compiling comma…
Simple way to call ‘cat’ from c++?
I am writing some C++ code and I need to pre-allocate an array based on the contents of a file. I can definitely read the the file and parse the strings a certain way, but it’s must easier to find the proper number from the following Linux one-liner: What is the best way to use this single one liner on