Top "Operating-system" questions

An operating System (OS) is a basic software whose role is to be an abstract layer between software requisitions for resources and the hardware available, manage input/output, memory allocation/deallocation, file systems, among other basic tasks a device (not necessarily a computer) should do.

What are the five most commonly used real-time operating systems?

I am looking for mostly used 5 Real-Time operating systems. I searched on Google and Wikipedia has a list of RTOSs, …

operating-system real-time rtos
python: get directory two levels up

Ok...I dont know where module x is, but I know that I need to get the path to the …

python path operating-system directory
How does Software/Code actually communicate with Hardware?

My question is: When I press the "Shut down" button in Windows/Linux,the computer shuts down. How did the …

operating-system
What's the difference between "virtual memory" and "swap space"?

Can any one please make me clear what is the difference between virtual memory and swap space? And why do …

operating-system terminology
Maximum memory which malloc can allocate

I was trying to figure out how much memory I can malloc to maximum extent on my machine (1 Gb RAM 160 …

c memory-management operating-system malloc cpu-architecture
How to get the PATH environment-variable separator in Python?

When multiple directories need to be concatenated, as in an executable search path, there is an os-dependent separator character. For …

python operating-system environment-variables
Java get available memory

Is there any good way to get the remaining memory available to the JVM at run time? The use case …

java performance web-services memory operating-system
Understanding load average vs. cpu usage

Okay, I'm very much a Windows user myself, so my knowledge of Linux-y type things is a bit limited. However …

linux operating-system load
Difference between user-level and kernel-supported threads?

I've been looking through a few notes based on this topic, and although I have an understanding of threads in …

multithreading process operating-system theory
What does fflush(stdin) do in C programing?

I am very new to C programming and I am trying to understand how fflush(stdin) really works. In the …

c operating-system signals