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.

learn more… | top users | synonyms (1)

-1
votes
0answers
34 views

I'm trying to get the exact time from either www.time.gov or my computers internal clock [on hold]

I'm not sure even where to start, any good way to go about this? I'm trying to figure out how to get it in the form of a string or just raw data that I could then interpret in code. I'd appreciate any ...
13
votes
3answers
503 views

Why aren't “fat binaries” more widely used for cross-platform applications?

As far as I know, so-called "fat binaries"--executable files that contain machine code for multiple systems--are only really used on Apple PCs, and even there it seems like they only used them because ...
3
votes
2answers
622 views

How do you usually compile C/C++ source code ? (Large code bases) [closed]

It's been quite some times since I began learning C and C++ but I've been very limited only to the Windows platform and the Visual Studio environment. Recently, I wanted to look into some open source ...
0
votes
1answer
41 views

What are the languages, objects, data types, operations and features for lower levels in a multilevel model of a computer system?

From Structural Computer Organization by Tanenbuam In a certain sense, a computer with n levels can be regarded as n different virtual machines, each one with a different machine language. We ...
1
vote
2answers
106 views

How does a DMA controller work?

From Section 5.1.4 Direct Memory Access in Modern Operating Systems by Andrew S. Tanenbaum, Herbert Bos, 2014, To simplify the explanation, we assume that the CPU accesses all devices and memory ...
3
votes
2answers
108 views

are multithreading, multiprocessing, multitasking implemented at instruction set or OS?

On a computer with a single cpu core, must a multithreading program be implemented based on an OS? Can it be implemented in the instruction set and run without an OS? Can multiple programs run in ...
27
votes
3answers
2k views

Kernel mode web servers: A clever optimization or a security nightmare?

I was reading a Hacker News thread where one user posts a link from 2011 explaining that IIS is much faster than most other (*nix) web servers. Another user replies, explaining that IIS gets that ...
3
votes
4answers
324 views

Does it make sense to say if an OS is Turing complete

The book "Modern Operating systems", says The Operating System is an Extended Machine. So I wonder if an OS is a model of computaion, and whether it makes sense to say if an OS is Turing ...
-1
votes
1answer
83 views

What differences are between “play-by-play”, design and implementation of an OS? [closed]

From two books' review Daniel Bovet and Marco Cesati. Understanding the Linux Kernel (2nd Edition or newer): Note: this book has some tendency to function as a play-by-play of what happens ...
0
votes
4answers
169 views

Why is there little use of filesharing as compression (outside of libraries)?

Recently I was looking for a program that will run as a daemon and find files that have the same size/type, check if they're the same, then make both a hard link to a single copy if they are. And I ...
0
votes
0answers
55 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 ...
0
votes
1answer
80 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 ...
0
votes
4answers
849 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 ...
0
votes
0answers
37 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 ...
-2
votes
1answer
239 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 ...
-1
votes
1answer
81 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
votes
3answers
563 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 ...
61
votes
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 ...
0
votes
3answers
126 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
votes
1answer
341 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
votes
1answer
143 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 ...
1
vote
6answers
512 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 ...
0
votes
2answers
148 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 ...
0
votes
1answer
125 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
votes
5answers
493 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 ...
-1
votes
1answer
135 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 ...
1
vote
1answer
122 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. ...
2
votes
2answers
79 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 ...
0
votes
2answers
327 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 ...
0
votes
3answers
187 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
votes
0answers
108 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
votes
1answer
198 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 ...
2
votes
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?
3
votes
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 ...
1
vote
1answer
325 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 ...
1
vote
4answers
563 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 ...
1
vote
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
votes
1answer
774 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
votes
1answer
384 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 ...
5
votes
3answers
314 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
votes
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
votes
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 ...
1
vote
1answer
851 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.
4
votes
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
votes
9answers
4k 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
votes
2answers
360 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 ...
0
votes
3answers
208 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 ...
-3
votes
6answers
399 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
votes
3answers
510 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 ...
-1
votes
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?