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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Why is threading platform-dependent?

I am reading book "Foundations of Qt Development", Chapter 12, and I read that threading is platform-dependent, can someone explain, why? I know how to use threads but that what they said is not so ...
4
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1answer
75 views

Kernel operation

I'm trying to grasp the concept of an operating system at the moment (on Unix-like machines) The kernel is the process with PID 0. Of course the Kernel is not really "just another process" because a ...
0
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1answer
156 views

Kernel facilities needed for C++

I'm working on a kernel for a proprietary embeded system. I've had no issues but I'd like to expand its capabilities directly. I made it run C. I did so pretty much by giving my kernel a stack. My ...
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1answer
60 views

Where should we put folders on the user's computer? [closed]

This reddit post makes a good point: Why do developers create so many folders directly in "My Documents". My home folder is completely full of this kind of stuff (especially when I show hidden files ...
3
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1answer
81 views

Effect of demoting copy-on-write page to read-write on other processes

The Windows OS tries to conserve physical memory usage by allowing DLLs loaded in their base (desired) address in different processes to use the same physical pages with copy-on-write semantics; this ...
3
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3answers
182 views

What's the point of hidden files?

What is the point of hidden files? In Microsoft Windows they exist, in Mac OS X they exist and in Linux they exist. It seems to me that it just makes detecting malware more difficult. The only upside ...
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0answers
28 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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2answers
115 views

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 ...
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1answer
29 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 ...
3
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2answers
216 views

Trying to understand on what “user.dir” property actually means?

So basically wen I googled on what the "user.dir" property does I got this link to a similar question on stackexchange: Java “user.dir” property - what exactly it means? So basically the answer given ...
5
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1answer
105 views

Pthread scheduling (System and Process)

I've read the operating system concepts 8th edition written by abraham silberschatz. However, I don't understand Pthread Scheduling. Thread-library schedules user-level-threads on LWP(Lightweight ...
4
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1answer
106 views

Threads: the difference of concurrency between many-to-one model and one-to-one model

I am studying "Threads" part with a textbook, Operating system concepts written by Abraham Silberschatz, Peter, Greg. First, I'm going to say something in the textbook related to my question, and ...
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0answers
77 views

Architecture of an extendable application

I am developing an embedded application on an ARM platform. I want to use ArchLinux as the underlying operating system and then create my own GUI. I want the application to be extendable (have apps if ...
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1answer
88 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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1answer
49 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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4answers
936 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 ...
25
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5answers
4k views

Why don't Windows/Linux use relational Databases (RDBMS)?

Why don't Windows/Linux use relational databases (RDBMS)? I know they use file systems to store all data but don't you think it is more efficient to use databases like we use in web sites/web apps? ...
2
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0answers
501 views

Cross-compiling Java app to run directly on ARM

Please note: although I am using ARM SAM3X8E in this example, I'm just using that as a concrete example, and the answer to this question could easily be given using any other MCU such as AVR, etc. I ...
2
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2answers
248 views

Compiling and deploying a C program to an MCU running an RTOS

Please note: Even though I'm specifically talking about an RTOS called Embox here, and even though I'm talking about AVR/ARm, I think this question can be answered by anybody whose ever done a fair ...
2
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1answer
99 views

Compiling and deploying RTOS to an MCU

Please note: Even though I'm specifically talking about an RTOS called Embox here, and even though I'm talking about AVR/ARm, I think this question can be answered by anybody whose ever done a fair ...
4
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2answers
1k views

Benefits of RTOS vs Bare Metal for MCU Programming?

Please note: This question specifically mentions two RTOSes but is more generic and can probably be answered by anybody who has written C code for embedded RTOSes before, and had their software run ...
0
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2answers
118 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 ...
4
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0answers
66 views

Seeking opinions on using device tree for I/O definition

I've been working ELLCC, a clang/LLVM based development tool chain targeting ARM, Mips, Microblaze, PowerPC, and x86 targets. The tool chain is pretty complete and runs on Linux, Windows, and Mac OS ...
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1answer
549 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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3answers
134 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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2answers
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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1answer
139 views

Translation Lookaside buffer - Lookup By Page Size

I am having a hard time finding documentation that explains precisely how the various TLB caches are used in modern processors. Most modern processors have separate TLBs for code/data. That in itself ...
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5answers
947 views

Do bare computer systems (without OS installed) use (executable) files? [duplicate]

As far as I read, files are introduced in OS books. Before an OS is installed on a bare computer system, does the computer use files? In particular, executable files have formats in OSes, e.g. ...
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3answers
378 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 ...
18
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3answers
1k 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 ...
4
votes
2answers
1k 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
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1answer
124 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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2answers
8k 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 ...
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2answers
326 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
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3answers
3k 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
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4answers
417 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 ...
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1answer
97 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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4answers
174 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 ...
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0answers
113 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
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1answer
297 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 ...
2
votes
4answers
2k 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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0answers
57 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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votes
1answer
420 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 ...
0
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1answer
107 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
4k 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 ...
64
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11answers
9k 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
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3answers
138 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 ...
5
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1answer
398 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
217 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 ...
3
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7answers
687 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 ...