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Semaphores

Asked By: tereraiterence | Asked On: Jan 26th, 2009

Describe how a semaphore is used in operating system?

Answered by: Kishore Rajendra on: Mar 6th, 2014

Semaphore is an non-negative integer, which is used to provide mutual exclusion to processes trying to access a same resource. For example, if you are copying a file, then you cannot move it to some ...

Answered by: user569 on: Feb 7th, 2013

Semaphore is a shared binary variable which can take values either 0 or 1. The primary purpose of them is to ensure mutual exclusion property between or among the two or more processes that want to en...

Is it possible system run without ram? Explain

Asked By: surya karn | Asked On: Aug 25th, 2012

Answered by: Kishore Rajendra on: Mar 6th, 2014

No. You cannot run a system without RAM. Because to start a computer, its Operating System has to be loaded into RAM(Random Access Memory).

The processor reads what to do next (instructions) from RAM. So without RAM, you cannot start a computer, and you cannot tell it what to do.

Answered by: rahul on: Sep 14th, 2013

No, it is not possible to run the system without RAM,because, ram is random access memory,it is used for the temporary holding the process data.

Difference between a process and a program?

Asked By: pinky_princess88 | Asked On: Nov 21st, 2005

Answered by: Simran Jeet Singh Bagga on: Feb 16th, 2014

A Program or Computer Program essentially provides a sequence instructions (or algorithms if you rather) to the operating system or computer. These computer programs come in an executable form that th...

Answered by: priyanka chavan on: Nov 15th, 2013

process is dynamic entity.
program is static entity.program does not perform anything by itself.

Difference between ntfs and fat32?

Asked By: ravi_poo2002 | Asked On: Mar 24th, 2006

Star Read Best Answer

Editorial / Best Answer

Answered by: Aparna Patil

Answered On : Mar 24th, 2006

NTFS

1)allows access local to w2k,w2k3,XP,win NT4 with SP4 & later may get access for somefile.

2)Maximum size of partition is 2 Terabytes & more.

3)Maximum File size is upto 16TB.

4)File & folder Encryption is possible only in NTFS.

FAT 32

1)Fat 32 Allows access to win 95,98,win millenium,win2k,xp on local partition.

2)Maximum size of partition is upto 2 TB.

3)Maximum File size is upto 4 GB.

4)File & folder Encryption is not possible.

Answered by: Vitish on: Nov 7th, 2013

New technology file system

Answered by: rahul on: Sep 14th, 2013

fat-file allocation table,not secure mostly used in win 98 and flash drive.
NTFS:-new technology file system,secure,more feature than fat,like encryption,decryption

What is the main difference between gpos and rtos?

Asked By: satyagmk | Asked On: Nov 14th, 2007

Answered by: dikshith on: Oct 21st, 2013

GPOS

1.It is used in multiuser environment
2.protected memory model
3.non scalable
4.high interrupt latency
5.time insensitive

RTOS

1.it is dedicated to a single work
2.flat memory model
3.scalable
4.low interrupt latency
5.time sensitive

Answered by: mohammadali on: Aug 7th, 2011

The main difference between GPOS and RTOS is that the RTOS should be deterministic. That is, the time consumed by the operating system to execute it's service is fixed where as in GPOS it's variable...

Define associative memory. Discuss its limitations and suggest a remedy.

Asked By: sarkarzinnia | Asked On: Aug 28th, 2007

Answered by: aravind kumar on: Jul 6th, 2013

example:neural network which classify the data based on its content

Answered by: Sandhya.Kishan on: Jul 11th, 2012

Associative memory is the type of memory that allows the recall of the data based on the degrees of similarity between the input pattern and the pattern stored in the memory.It is a memory organization where memory is accessed by content and not through address.

Typical user defined signal handler functions perform actions such as

Asked By: xyz10 | Asked On: Oct 1st, 2012

A) abort process immediately without further ADO b) perform minor house keeping prior to resumption c) roll back process state to last checkpoint d) tidy up to process abortion a) 1&2 b) 2 & 4 c) 3 d) 4

Belady's anomaly

Asked By: vineelkumar | Asked On: Jan 31st, 2008

What is belady's anomaly and why does it occur ? How would you avoid this ..?

Answered by: Aditya on: Jul 11th, 2012

Usually, on increasing the number of frames allocated to a process virtual memory, the process execution is faster, because fewer page faults occur. Sometimes, the reverse happens, i.e., the executio...

Answered by: sravan_reddy001 on: Jun 24th, 2008

The Belady's anomaly accurs in case of the FIFO page replacement policy in the OS.When this FIFO is used and the number of page frames are increased in number, then the frames that are required by...

Difference between time sharing and multitasking systems?

Asked By: Nithyaa | Asked On: Jun 18th, 2006

Answered by: Shruti Garg on: Jun 19th, 2012

Multitasking is Timesharing system + Management of timesharing system. Therefore Multitasking is broader concept.

Answered by: Deepak nehra on: Sep 18th, 2011

Multitasking can be achieved by Time sharing operating system. In time sharing O/S CPU time is divided into fixed small time slices and each task given this fixed duration of time. It uses the Round Robin scheduling algorithm.
thanks!!!!!!!!!

What is the shortest definition of os?

Asked By: ashish garg | Asked On: Aug 30th, 2006

Answered by: Lingapandi on: Jun 4th, 2012

Operating system is a system software.

Answered by: anon on: May 3rd, 2012

Operating System;
System which controls the operations of the hardware. Serves as an intermediary between the application layer and the hardware it interfaces with.

Multitasking and timesharing system

Asked By: sandipan ds | Asked On: Feb 27th, 2010

What is the difference between multitasking and timesharing system? What are their properties, merits and demerits?

Answered by: RANJAN on: Dec 20th, 2011

Timesharing system: There is a given time for each process and on the basis of this time, multiple programs are executed.

Multi-tasking system: Multiple request come to processor and one after another task should be carried out. It may be take more time than the timesharing system.

Discuss the layered structure of an operating system. List the major services provided by an operating system

Asked By: aakansha_133 | Asked On: May 15th, 2007

Answered by: Lokesh M on: Dec 19th, 2011

Layered structure of an operating system: LAYERS ===== User User Interface Program / Application Program System Services and File System Input and Output Management User Console Memory Management Pro...

Resource manager parameters

Asked By: sk_naresh | Asked On: Aug 4th, 2008

What are the parameter of resource manager?

Answered by: Lokesh M on: Nov 30th, 2011

Resource Parameters are classified under 2 categories: Main Parameters Additional Parameters Main parameters are the most important parameters pertaining to functionality, performance, and availabil...

Before operating systems

Asked By: ramya kandasamy | Asked On: Mar 10th, 2010

Before the introduction of operating systems what concept was used in computer?

Answered by: Lokesh M on: Nov 30th, 2011

Prior to the introduction of Operating System, operation instructions were generally fed into the electronic system bit by bit on rows of mechanical switches or by jumper wires on plug boards.

Give tabular difference between batch processing,time sharing,online time sharing,multiprogramming batch system and distributed operating sustems?

Asked By: amrinder singh | Asked On: Aug 1st, 2006

Answered by: patel rajanikant on: Nov 13th, 2011

Batch Processing:In batch processing Operating systems the tasks are performed in batches,os waits for a batch of tasks to arrive and performs the operation on the batch. Time Sharing: in time sharin...

Answered by: mamta09 on: May 17th, 2008

batch processing when all the job in a batch is processed by the os on the basis of priority of job without user intervention is called batch processingIn time sharing systems the cpu time is shared b...

What is the meaning of physical memory and virtual memory?

Asked By: vanitha | Asked On: Mar 5th, 2006

Answered by: mohamed Tausif on: Oct 16th, 2011

Wrong Ans ........bro ............. virtual memory is a feature of operating system that enables a process a memory(RAM) address space that is independent of other processes running, and USE THE SPACE THAT IS LARGER THEN THE ACTUAL AMOUNT OF RAM IS PRESENT.

Answered by: Parthiban on: Oct 13th, 2011

Physical memory is the actual real memory used in RAM. Virtual memory as the name suggests is not real. The OS uses virtual memory as a memory management technique in which non-contiguous memory is pr...

The first-fit test and the worst-fit algorithm can be used for 1. Contiguous alocation allocation of memory 2. Linked alocation allocation of memory 3. Indexed alocation allocation...

Asked By: Rujul | Asked On: Mar 9th, 2007

Answered by: shiv prakash on: Oct 16th, 2011

Answer 1: use for contiguous memory allocation.

Answered by: shweta on: Sep 11th, 2011

Answre is 1. For contiguous memory allocations

What is the hibernation mode?

Asked By: Gagan Anand | Asked On: Jan 4th, 2006

Answered by: Sunny on: Aug 10th, 2011

Pre above explanation, only computer has "Hibernation Mode", whether the LAN HUB also include the function or not?

Answered by: kartik prakash on: May 18th, 2006

hibernation mode in windows refers to the mode in which we can just conserve power without closing applications.when we shut down,all the applications closes first and then the system gets off. but in...

Types of file system in LINUX?

Asked By: kishora | Asked On: Sep 22nd, 2006

Answered by: sunilbaglur on: May 12th, 2011

Linux - File System format supported

EXT2 - Extended 2

EXT3 - Extended 2 + Journal

JFS - Journal file system

Resier - Advanced Journal

LVM - Logical Volume manager

VFAT - FAT 16 / 32

EXT 4 [WHICH IS LATEST IN RHEL6.0]

Answered by: moorthyvsm on: Jul 8th, 2008

There are lot of file system types are used in Linux. Mostly Linux uses ext3 file ystem.You can know by using the command given below.

fdisk /dev/dsa
fdisk /dev/hda

Once you executed the above one just type "l" and it will show all fil system types in linux.

Difference between win98 and windowsxp?

Asked By: Prince | Asked On: Jul 29th, 2006

Answered by: parupradhi85 on: Jul 22nd, 2008

  Dear frnd,Win981. Win98 Support FAT file system & XP support NTFS And Also FAT. 2. Win98 Does not Having Remote Access facility While in XP there is.3. win98 Does not need faster proce...

Answered by: parupradhi85 on: Jul 21st, 2008

1. Win98 Support FAT file system & XP support NTFS And Also FAT. 2. Win98 Does not Having Remote Access facility While in XP there is. 3. win98 Does not need faster processing speed while XP Need ...

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