An embedded operating system is an operating system for embedded computer systems. This type of operating system is typically designed to be resource-efficient and reliable. Resource efficiency comes at the cost of losing some functionality or granularity that larger computer operating systems provide, including functions which may not be used by the specialized applications they run. Depending on the method used for multitasking, this type of OS is frequently considered to be a real-time operating system, or RTOS.
The hardware running an embedded operating system can be very limited in resources such as RAM and ROM, therefore embedded design of these operating systems may have a narrow scope tailored to a specific application in order to achieve desired operation under these constraints. In order to take better advantage of the processing power of the CPU, software developers may write critical code directly in assembly. This machine efficient language can potentially result in gains in speed and determinism at the cost of portability and maintainability. Often times, embedded operating systems are written entirely in more portable languages, like C, however.
An important difference between most embedded operating systems and desktop operating systems is that the application, including the operating system, is usually statically linked together into a single executable image. Unlike a desktop operating system, the embedded operating system does not load and execute applications.[1] This means that the system is only able to run a single application.
See also[edit]
![Embedded Embedded](/uploads/1/2/6/3/126376970/233206765.png)
- Embeddable Linux Kernel Subset, a Linux operating system that fits on a floppy disk
- Principle of least privilege (computer security)
References[edit]
Ask a question here View 7 questions. The embedded server. Mysqlfindrows Read files containing SQL statements and extract statements that match a pattern. Replace Utility The replace utility program changes strings in place infiles or on the standard input.
- ^Programming Embedded Systems, Second Edition, Michael Barr and Anthony Massa
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Embedded_operating_system&oldid=925630911'
Here is a spurious collection of semi to totally unserious stuff,mostly postings found wafting gently in the comp.lang.pythonnewsgroup (a.k.a. the python-list mailinglist).
See also Andrew Kuchling's collection of Python quotations, containing in acondensed form some sterling examples of the wit and wisdomencountered in the Python world.
Contents
Explicit is better than implicit.
Complex is better than complicated.
Sparse is better than dense.
Special cases aren't special enough to break the rules.
Errors should never pass silently.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Although never is often better than right now.
![Macos and ios internals, volume i: user mode pdf download Macos and ios internals, volume i: user mode pdf download](/uploads/1/2/6/3/126376970/747166480.png)
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!
—Tim Peters
(This classic is also available in the Python interactive interpreter,just import this!)
A little girl goes into a pet show and asks for a wabbit. The shopkeeper looks down at her, smiles and says:
'Would you like a lovely fluffy little white rabbit, or a cutesywootesly little brown rabbit?'
'Actually', says the little girl, 'I don't think my python wouldnotice.'
—Nick Leaton, Wed, 04 Dec 1996
There's an endless series of jokes about how to shoot yourself in thefoot using a particular programming language. Here are entries forPython and Java:
Python: You create a gun module, a gun class, a foot moduleand a foot class. After realising you can't point the gun at thefoot, you pass a reference to the gun to a foot object. After thefoot is blown up, the gun object remains alive for eternity, readyto shoot all future feet that may happen to appear.
Java: You find that Microsoft and Sun have releasedimcompatible class libraries both implementing Gun objects. Youthen find that although there are plenty of feet objectsimplemented in the past in many other languages, you cannot getaccess to one. But seeing as Java is so cool, you dont care and goaround shooting anything else you can find.
—Mark Hammond
[Reuters] There are unconfirmed reports that MicroSoft Inc. isconsidering bringing an intellectual property infringement actionagainst the inventer of the Python programming language claimingthat the language documentation infringes on MicroSoft's rights tothe Monty Python Flying Circus. Steve Ballmer, MicrosoftExecutive Vice President, is reported to have said 'This is veryserious -- we paid almost a quarter billion for those rights; thisis almost up there with the Mona Lisa thing.'
Microsoft reportedly is willing to stop the action if either alicensing agreement can be worked out or if Guido Van Rossum, theinventer, changes the name of the computer language and personallydestroys all references to Spam, the Spanish Inquisition, and soforth, in all copies of the Python code and documentationwhereever they may have propagated.
A highly placed White House Official claims that President Clintontakes the matter very seriously and is willing to break off alldiplomatic relations with the government of Japan over the issue.'We're beginning to wonder if this information super-highway thingis such a good idea after all,' she said. The ambassador of Japanin Washington is reportedly 'very, very confused.'
A highly placed Speaker of the House, who asked not to be named,is reported to have said, 'I thought Guido was an Italian name.Those damn Japanese are sure crafty!'
In an unrelated development, Stacker Inc. is reportedlyconsidering bringing action against Van Rossum, Brian Kernigan,and Don Knuth over their alleged infringement on Stacker's 'forloop' patent.
—Aaron Watters, Thu, 30 Mar 1995
Washington DC: April 1, 1998.
Senators Exon and Danforth today called a press conference toannounce new efforts to make the internet safe for children.
'Bleeding heart, do-good, L-word lawyers and judges have twisted thefounding father's obvious intentions and used First Amendment as aprotection for subversives, satanists and pederasts', said theirrelease. 'But today we have uncovered a threat so insidious, somorally debilitating, so counter to any notion of the public good,that it is unimaginable that even the most depraved, card-carryingACLU member will fail to see the need for immediate action.'
The Senators refused to describe the practice in detail, butreliable sources referred to it as 'fractional winkery'. Medicalresearch into the affects of the practice had to be halted when aimpromptu VIP tour of the facilities came upon the researchers, starknaked, in their lab. 'They had 16 rolls of duct tape, 2 bags ofclothes pins, 130 hampsters from the cancer labs down the hall, andat least 500 pounds of grape jello and unknown amounts of choppedliver' said the source on a recent Geraldo interview. The researcherswere summarily dismissed. 'What's truly disturbing is that theyapparently showed absolutely no sign of remorse' commented Geraldo.'These were ordinary, hard working people... They could have beenyour children... All they could do was laugh.'
In a possibly related anouncment, the Massachusetts Home for theBewildered (soon to become the Massachusetts Institute of TabSciences) reports the recent discovery of an escape that took placesome time ago. The escapee is thought to be a practioner of'fractional winkery' according to second hand reports, (first handreports being unreliable, because most of the original staff are nowinmates). The escape was discovered during an outside audit of MHB'scomputer systems. 'I became suspicious of some code in the inmaterelease modules', said the auditor. 'It suddenly occurred to me thatI was looking at code that was much better than anything MHB'sinternal staff could write. It was really very, very, very, very,very, very clever. If he weren't such a wacko, I'd hire him myself.'
Happy NTPAD!
—Gordon McMillan, Wed, 1 Apr 1998
... and ...
... and THEN someone had the AUDACITY to say ...