An operating system (OS) is a basic software whose rule is to intermediate software requisitions for resources and the hardware available, manage input/output, memory allocation/deallocation, file systems, among other basic tasks a device should do.

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How does the graphics in a GUI-based Operating System work? [closed]

I have an understanding of how event-driven a gui system is. But I want to know the graphics aspect of it. That is, how the different elements like buttons are generated. Forget about frameworks. As I ...
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0answers
44 views

Concurrent Processes - Monitors and Reader/Writers

So this is a general question about the use of monitors in the Reader/Writers problem. I know the monitor procedures for the Readers/Writers problem are used for mutual exclusion to a critical ...
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1answer
65 views

What metadata do files contain? [closed]

I know when a file is created date information such as date created, last modified, last opened, is automatically updated as meta data on that file. Is there other meta data though? Specifically, is ...
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4answers
740 views

Why was Fortran never used to develop an Operating System?

I'm not a Fortran developer myself, but I'm about to use it a little and found myself wondering why, if it is much older than C but equally as performant as C, was it never used to develop any ...
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33 views

Semaphore : one for each shared resource?

Normally semaphores are implemented as integer variables. The value of a semaphore represents initially the number of processes that are allowed to access the shared resource at the same time, which ...
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1answer
198 views

What are steps in making an operating system in C ? [duplicate]

I am trying to make an my own OS. This is for educational purpose only, so that I get to understand the internals as well as get a good idea of low level programming. I have some prior application ...
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1answer
80 views

How do processes communicate? [closed]

What transports/pipes/interops are available that most or all languages support across OSs? Not necessarily, network, but interprocess. Or is interprocess communication OS specific? I mean, for ...
3
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3answers
363 views

How to operate a computer without an operating system?

How a computer can be used when there is no operating system? What tools or knowledge do I need to do it? Do I have to give all the commands in binary to use computer hardware resources like a ...
60
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11answers
8k views

Why is software OS specific?

I'm trying to determine the technical details of why software produced using programming languages for certain operating systems only work with them. It is my understanding that binaries are specific ...
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3answers
123 views

What are the limits of using OS X when it comes to compiling and running CLI-based tools and scripts that were written with Linux in mind?

I run little scientific scripts and C tools on OS X from time to time. For the C tools, I just download the source and compile using the provided Makefile. I usually don't have any problems when using ...
4
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1answer
335 views

How do programming languages integrate with OS runtimes

For example, Objective-C, Swift and Ruby (i.e. RubyMotion) integrate with the Cocoa framework. Is this done via linked libraries? I assume they call functions in existing binaries instead of simply ...
3
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1answer
137 views

Why do we need fork to create new process

In Unix whenever we want to create a new process, we fork the current process i.e. we create a new child process which is exactly the same as the parent process and then we do exec system call to ...
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6answers
509 views

Why can we not insert into files without the additional writes? (I neither mean append, nor over-write)

This occurs as a programming language independent problem to me. I have a file with the content aaabddd When I want to insert C behind b then my code needs to rewrite ddd to get aaabCddd Why ...
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2answers
110 views

Multi-level paging tables

Referring to the image here: From http://en.wikipedia.org/wiki/File:X86_Paging_4K.svg Could somebody please explain something for me? I don't get exactly how this works. As I understand it the ...
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1answer
94 views

Scheduling between child and parent process

When child processes are created using the fork system call what is there scheduling priorities..are they same? if so will always a child process run first and then parent...or is there a manipulation ...
3
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5answers
430 views

Virtual machine for a high level programming language vs an operating system

It struck me recently that a virtual machine for a high level programming language is very much like an OS. It manages resources, e.g. stack, heap, etc. similar to how an operating system manages ...
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1answer
127 views

How do memory-clean apps work? [closed]

In terms of operating system architecture, what does a memory-clean software to get rid of all data that fill the virtual memory? I assume that it simply saves all RAM data into a file, but how does ...
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1answer
121 views

How do programs generally get information from the OS?

In many languages there are libraries, either built into the language itself or built separately outside of the language, which allow information to be taken from the operating system at some level. ...
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2answers
76 views

How should an embedded OS be combined with user code?

As a side-effect of an embedded project I've been working on, I've developed a small operating system for an ARM processor. While the OS and my user code are in separate directories and have clean ...
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2answers
283 views

Little and Big endian confusion

Just to make sure if I understand this correctly. Is this right that little endian processors read the memory addresses from highest to the lowest address and where as a big endian processors suppose ...
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3answers
178 views

If mutual exclusion is not implemented, how would we detect a race condition?

Suppose we are in a distributed environment, and mutual exclusion is not implemented yet. So how would we be able to detect race conditions? When I researched, use of non-blocking algorithms was ...
0
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0answers
107 views

Why user threads are mapped to Kernel threads

Since user threads are mapped to kernel threads, why don't we create all threads as kernel threads that is a process with zero user thread. Doesn't mapping of user thread to kernel thread create ...
-1
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1answer
184 views

Linux kernel development

I am trying to understand the linux kernel and there is one thing that is puzzling me for quite a while. As linux is used across variety of platforms (like smartphones,desktop,supercomputers etc) and ...
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2answers
2k views

How Stack and Heap is allocated for threads under the same process in Windows?

Stack for different thread is different.but what about Heap. If Heap is different for different threads, then how they share objects?
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1answer
1k views

Windows Console App vs Service

My Situation I work for a company that builds software for many other companies. When I learned installers weren't built-in with VS2012, I was curious how to deploy. So far, I have just been dropping ...
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1answer
306 views

Operating systems theory — using minimum number of semaphores

This situation is prone to deadlock of processes in an operating system and I'd like to solve it with the minimum of semaphores. Basically there are three cooperating processes that all read data ...
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4answers
470 views

Testing on different operating systems

I am a developer who has windows 7 installed as the host operating system with vmware. I have linux installed using vmware. Therefore I am able to test java and c++ apps on windows 7 and Linux. I ...
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2answers
92 views

Could we set priorities only relative to each other instead of fixed numbers?

AFAIK the lowest priority has the highest number in scheduling and in my system all priorities must be different. But isn't other policies thinkable? For instance, how about a policy where priorities ...
2
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1answer
699 views

Multilevel Queue Scheduling (MQS) with Round Robin

I'm trying to use MQS to create a Gantt chart of 5 processes (P1-P5) as well as their waiting, response, and turnaround times (and averages of those metrics) within a CPU task schedule. Here's the ...
3
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1answer
349 views

What do goroutines, Ruby Fibers, etc. look like to the OS/Kernel?

In process concurrency and thread concurrency it's quite obvious how the kernel sees these as they map directly to real things that the kernel manages. When it comes to Golang goroutines and Ruby ...
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3answers
296 views

Writing a bootloader with no bootloader

I have a question that I really can't find a straight answer to. Let me start by saying I'm not asking for a step by step tutorial, or even plan on doing anything. I'm just curious. I've been ...
20
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3answers
1k views

In reality, a developer also administers DBMS and system? [closed]

I really don't know where else to ask. So here it goes. I'm working at a very tiny company that makes ERP software and websites. 1 developer with + 10 years experience. 2 developers with + 3years ...
5
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5answers
4k views

Is it possible to write an operating system in C?

A while back I saw a comment on a Stack Overflow question that surprised me: No one can write an operating system in C. It is not possible. What one can do is write an operating system in a ...
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1answer
750 views

Which child process will inherit threads of parent process?

What happens when one process have child threads and child process , will child process inherit all child threads of parent process.? Assume OS is Linux . Let it be Java Threading model.
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4answers
1k views

Should multi-threading be used for tasks which does not involve IO operation?

I was reading a book on OS and got confused between different terminologies. I hope i will get my doubt cleared here. These questions might be very basic for some experts, but i find this platform ...
36
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9answers
3k views

Why not have a High Level Language based OS? Are Low Level Languages more efficient?

Without being presumptuous, I would like you to consider the possibility of this. Most OS today are based on pretty low level languages (mainly C/C++) Even the new ones such as Android uses JNI & ...
3
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2answers
317 views

Can I fork Linux source code, change it around to suit my desires, and claim it as my own kernel without doing any of the originating work?

Is it acceptable form to take Linux kernel source from any version, change it, claim it is mine, and then distribute it for monetary gain? In such a case open-source software is entitled to a sort of ...
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3answers
187 views

How does the operating system regain control when multitasking? [duplicate]

I get how multiple processes can run on a single core by interleaving the processing. What I don't understand is how the operating system ensures that the program releases the processor after a ...
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6answers
392 views

Does Turing-complete implies possibility of malware? [closed]

Is it possible to build an operating system that contains some Turing complete compiler (language?) but is unable to run any malware? Or is there any definition for a malware? This question popped on ...
4
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3answers
479 views

Javascript behavior depends only on browser or browser + OS?

Generally for a javascript application, compatibility is mentioned in terms of browser types and browser versions it supports. Frameworks/Libraries like ExtJs also mention about the browser versions ...
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4answers
2k views

C++ or C#: Which language is Microsoft going to use in development of future Windows versions? [closed]

I heard almost all parts of Windows are written in C and C++ with some assembly. Why did Microsoft skip C#? Is there any scope for C# in the development of future Windows versions?
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3answers
1k views

Why Apple doesn't “force” the user to update by installing the needed API updates when the user downloads a new app? [closed]

I was here programming in iOS with a class that's available only for iOS 6, and I was wondering: why should I implement my app to handle multiple operating systems when my app will be distributed by ...
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1answer
208 views

Technical interview graphics-related concepts fundamentals [closed]

I'm having a technical interview with a graphics society in a few time and I'd like to expand my knowledge related to the following subjects: TLB (translation lookaside buffers and their role) low ...
1
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2answers
517 views

JVM vs operating systems [closed]

Recently i was re-visiting the basic concepts of operating systems. Since I am a java developer, I have inherently started looking at everything from java point of view. I am also reading 'Inside the ...
16
votes
4answers
4k views

Is it possible to read memory from another program by allocating all the empty space on a system?

Theoretically, if I were to build a program that allocated all the unused memory on a system, and continued to request more and more memory as other applications released memory that they no longer ...
-1
votes
3answers
252 views

How flexible can hardware get? [closed]

This subject is long time in the making for me and it particularly took off when I was researching bootloaders for computers and consumer electronics, which, I will note, differ drastically. I've ...
4
votes
2answers
317 views

What is the lifecycle for loading a Linux Desktop Environment?

I'm looking into delving into a bit of custom OS work (and yes I understand that doing any development at the DE level or lower on an OS is extremely complex and not a light thing to undertake, ...
0
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2answers
262 views

Are monolith and microkernel design patterns or strategies?

What's the difference between a design pattern and a strategy? Is the monolith actually an anti-pattern?
1
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3answers
329 views

Inter-process and inter-thread data sharing [closed]

I know that operating systems facilitate inter-process and inter-thread data sharing. I want to know about the mechanisms used to facilitate such sharing. I read about "pipes". What are the other ...
136
votes
11answers
12k views

How do operating systems… run… without having an OS to run in?

I'm really curious right now. I'm a Python programmer, and this question just boggled me: You write an OS. How do you run it? It has to be run somehow, and that way is within another OS? How can an ...