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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5answers
168 views
Is learning about operating systems useful for a software developer? [closed]
Most of the underlying workings of the operating system is hidden from the programmer. I believe that is also one of the purposes of an operating system. Then what are the reasons a software developer ...
0
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1answer
142 views
Two C program sharing same addresses
I was trying to understand structure padding , so i wrote a simple program as written below and i executed it .
just to make clear i made two copy of this program program1.c and program2.c and ...
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1answer
246 views
Can an OS be created with Python?
I have been pondering over the idea of a Python-based Operating System on top of the Linux kernel, much like how Android uses Java.
What if most of the system components were built using Python, this ...
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votes
1answer
69 views
In a OS how will threads communicate with other threads? [closed]
Lets say we have multiprocessor system(CPU 1,2,3). Each processor contain n processes. And each process contain multiple threads. How threads will communicate with the thread inside same process(P1) ...
2
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3answers
87 views
What is the relationship between a program and processes in the Operating System?
A program, I am referring to any program written in any programming language. It could be a Java program which has only one method to do the multiplication, and a main method executes that ...
0
votes
1answer
105 views
how is stack and heap are assigned to each processes?
How multiples processes are stored in the main memory , i understand every process will be divided into the equal size pages and will be stored in the frames of main memory. if whole main memory is ...
3
votes
1answer
95 views
How does I/O occur for large data files?
Assume that we have a 4GB RAM processor. Let's say we want to play a 4GB movie in VLC player. Now, processor first starts VLC Process and then starts to load 4Gb data. My question is how does this ...
0
votes
2answers
94 views
Why a thread uses a stack in a context switch?
Correct me if I'm wrong, but if I have an operating system that makes a context switch, then that context switch is in practice a switch from one thread to another, where one thread was running one ...
-1
votes
2answers
117 views
How to write code for different versions of linux
So, I've written some fairly big code for cent OS 7.1. The code essentially makes use of different command line tools by parsing the text output and shoving it in a database... pretty straight forward....
6
votes
2answers
386 views
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
votes
1answer
90 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
votes
1answer
171 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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votes
1answer
66 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 ...
4
votes
2answers
166 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
votes
3answers
199 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 ...
0
votes
0answers
35 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 ...
-3
votes
2answers
625 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 ...
0
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1answer
38 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 ready-to-...
3
votes
2answers
595 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
votes
1answer
184 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
votes
1answer
204 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 ...
0
votes
0answers
82 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 ...
0
votes
1answer
114 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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votes
1answer
56 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, N-...
0
votes
4answers
2k 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 ...
26
votes
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
votes
0answers
626 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
votes
2answers
318 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
votes
1answer
110 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
votes
2answers
2k 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
votes
2answers
120 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
votes
0answers
72 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 X....
0
votes
1answer
823 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 ...
0
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3answers
147 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 ...
0
votes
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?
1
vote
1answer
164 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 ...
0
votes
5answers
1k 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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votes
3answers
406 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 ...
20
votes
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
2k 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
149 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 ...
3
votes
2answers
11k 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 ...
5
votes
2answers
361 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 ...
28
votes
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
votes
4answers
438 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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votes
1answer
103 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
176 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 ...
1
vote
0answers
115 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
399 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 ...
