-
Define task and TCB?
pbchaudhari
- Aug 26th, 2007
A Process Control Block (PCB, also called Task Control Block or Task Struct) is a data structure in the operating system kernel containing the information needed to manage a particular process. The PCB is "the manifestation of a process in an operating system"
amit
- Oct 16th, 2006
Task control block that hold all information related to task
-
What is Dispatcher?
->Dispatcher module gives control of the CPU to the process selected by the short-term scheduler; this involves:Switching contextSwitching to user modeJumping to the proper location in the user program to restart that program Dispatch latency – time it takes for the dispatcher to stop one process and start another running.
pbchaudhari
- Aug 15th, 2007
The short-term scheduler (also known as the dispatcher) decides which of the ready, in memory processes are to be executed (allocated a CPU) next, following a clock interrupt, an IO interrupt, an op...
-
If a system has 128 MB RAM and 1 GB hard Disk, and a process decides to use its fully allotted Virtual Memory 2^32 - 2GB = 2 GB, how is it practically possible?. But this works in all machines. How?
00elton00
- Aug 5th, 2007
The above is possible due to the Paging. Both the Virtual Memory and the Physical Memory are broken down into pages of equal size, and a mapping, called the page table, is used to map virtual memory pages to physical memory pages.
Guest
- Jun 24th, 2006
Min virtual Memory size is 1.5 times of RAM (Exact RAM size + 11MB)Max Virtual Memory size is 3 times of RAM
-
How chkdsk command works?
freakzilla007
- Jul 23rd, 2007
Checkdisk is a command in DOS and Microsoft Windows systems which verifies a hard disk or a floppy disk for file system integrity. It is similar to the fsck command in Unix. By default, CHKDSK neithe...
-
-
What is difference between win95, 98, 2000, and NT? What is difference between unix and linux? Difference between windows and unix?
ravikumar_koyyada
- Jan 19th, 2007
Diff between unix and linux is that linux is look alike of unix which is freely available.Linux is based on the principles of FSF(free software foundation) and whose use is subject to GPL.Every applic...
Neel
- Nov 23rd, 2006
Difference between Win95,98,2000,NTwin95 and 98 is not networking based but win 2000 and NT are networking base OS and can be made multiuser.
-
What are the main difference between Micro-Controller and Micro- Processor?
A microcontroller is by definition a is a computer on a chip. It includes all the necessary parts (including the memory) all in one IC. You just need to apply the power (and possibly clock signal) to that device and it starts executing the program programmed to it. A microcontroller generally has the main CPU core, ROM/EPROM/EEPROM/FLASH, RAM and some necessary functions (like timers and I/O controllers)...
-
Differentiate between RAM and ROM?
Semiconductor memories are of two types: RAM (random access memory) and ROM (read only memory).RAM is a read/write memory. Information can be written into and read from a RAM. It is volatile memory.It stores information so long as power supply is on. ROM is permanent type memory. Its contents are not lost when power supply goes off. the user cannot write into a ROM.Its contents are decided by...
-
-
-
I am using Windows 2000 OS. At DOS prompt while I am issuing CD command to switch to an existing directory (eg. appserver) it is throwing error 'Invalid directory'. Would appreciate if anybody have an idea how to resolve it?
gdnaidu
- Jul 26th, 2006
mr.sunil has posted as might be given password using "ren", but "ren" command does not work from Windows NT. In your case it may happen that you might not be having user level rights to access that perticular file, or that that file might be encrypted with the older OS.
hmashruf
- Jul 10th, 2006
Hi ,I found CMD and COMMAND dos prompts does have a difference. And with COMMAND I am able to resolve the problem of entering into folders.Regards,-ashruf
-
What Location(on hard disk) for the default port numbers in NT based system?
-
Deadlock Detection-Algorithm Usage?
->When, and how often, to invoke depends on:How often a deadlock is likely to occur?How many processes will need to be rolled back?->If detection algorithm is invoked arbitrarily, there may be many cycles in the resource graph and so we would not be able to tell which of the many deadlocked processes “caused” the deadlock.
-
What is multi tasking, multi programming, multi threading?
Multi programming: Multiprogramming is the technique of running several programs at a time using timesharing.It allows a computer to do several things at the same time. Multiprogramming creates logical parallelism. The concept of multiprogramming is that the operating system keeps several jobs in memory simultaneously. The operating system selects a job from the job pool and starts executing a...
-
-
What are different tasks of Lexical Analysis?
The purpose of the lexical analyzer is to partition the input text, delivering a sequence of comments and basic symbols. Comments are character sequences to be ignored, while basic symbols are character sequences that correspond to terminal symbols of the grammar defining the phrase structure of the input
-
Give a non-computer example of preemptive and non-preemptive scheduling?
Consider any system where people use some kind of resources and compete for them. The non-computer examples for preemptive scheduling the traffic on the single lane road if there is emergency or there is an ambulance on the road the other vehicles give path to the vehicles that are in need. The example for preemptive scheduling is people standing in queue for tickets.
-
-
Different types of Real-Time Scheduling?
Hard real-time systems – required to complete a critical task within a guaranteed amount of time.Soft real-time computing – requires that critical processes receive priority over less fortunate ones.
-
Windows Interview Questions
Ans