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 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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219 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 ...
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528 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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113 views

Is renaming an 'alias' for moving?

Is it true to say (on Windows and Unix\Linux\OS X) that renaming a file or directory is just an alias for moving? e.g. Are there any side effects to either which are not present on the other? Does ...
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111 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 ...
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130 views

What is the explication for the difference execution time for the same instruction?

As you know when we run instruction in our code like long a = b; we will not have the same ticks each to be executed. first exeution it take 2ticks; second exeution it take 3ticks; third exeution it ...
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48 views

Examples of operating systems capable of serving http-requests that does not support direct slash for directory separator

My php framework uses DIRECORY_SEPARATOR constant instead of /. Can there be any other options for a directory separator?
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4answers
601 views

Relation between Kernel & BIOS routines [duplicate]

How does a Kernel provides different functionality to OS? Does it use the BIOS routines or use special device drivers for this, or something else? If uses BIOS how does it come to know which routine ...
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330 views

What are the components of a process? [closed]

What exactly is a process and what all things is a process comprised of? I have read the Wikipedia page and I found only abstract details over there. I want to know what details are stored by a ...
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1answer
104 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 ...
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135 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 ...
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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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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?
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225 views

Windows OS design decisions [closed]

I've seen an interview with Richard Stallman some time ago, and he was asked a question about security and Windows OS which he answered saying that there are some relatively bad design decisions that ...
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1answer
252 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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2answers
624 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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353 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 ...
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1answer
64 views

RIOT-OS and multiple executables?

I am brand new to embedded programming and am wondering if RIOT-OS has the capabilities that my small project requires. I have 3 executables, fizz, buzz and foo. They all do separate - but very ...
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26 views

File Hashing between OSes when Perforce changes line endings

I have a system of validating file downloads from a server. The server is running Ubuntu/AWS and generates the hash using data files it pulls from the version control, which is Perforce. It passes ...
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9 views

Does the chipset also determines installablility of 32bit OS or 64bit OS? [migrated]

I have Fujitsu Lifebook A6025 with Pentium T2130 and Intel® 945GM/ ICH7-M chipset according to the spec. I want to upgrade the CPU to Intel Core 2 Duo Mobile T7400(Socket M) CPU. The T2130 CPU ...
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1answer
25 views

What if a task waits for a resource in STCF algorithm?

I am a computer science student and I have an exam tomorrow on operating systems. I have the exam questions of past years and there is one scenario in a question. There are two tasks in the ...
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118 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 ...
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3answers
275 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 ...
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1answer
96 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 ...
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1answer
178 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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2answers
1k views

What is the relationship between the command line, the OS and the microprocessor? [closed]

I'm not totally clear on how using the command line differs from working through the OS' interface using an editor for example. Obviously the UI is different but I want to understand how the command ...
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1answer
251 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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3answers
363 views

Programming in Linux (C++) [closed]

So I don't know If this is the right place to ask this. I am new to programming, I am not very in to it (I know classes,arrays,functions..etc(Basic Things)). I was programming with Visual Studio 2013 ...
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1answer
400 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
48 views

Move file into apropriate directory based upon first letter of second word, followed by the first two letters of the second word with Python [closed]

EDIT: Apparently the below question is too specific. Let me rephrase: I'm looking for a way to fit a letter into a list of specified ranges such that, if given the letter S and the ranges A-F, G-M, ...
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6answers
474 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 ...
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3answers
2k 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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What are the differences between operating systems and computer systems?

Wikipedia's definition of a "computer system" is: Computer system is define as the combination of hardware software user and data with referring to communication and procedure involved in between ...