definition of User-Level Thread?, Basic Computer Science

Assignment Help:
User-level threads apply in user-level libraries, before via systems calls, so thread switching does not require to call operating system and to cause interrupt to the kernel. Actually, the kernel knows nothing about user-level threads and handles them as if they were single-threaded processes.
Advantages of User-Level Threads:
1. The most obvious benefit of this technique is that a user-level threads package can be implemented on an Operating System that does not support threads. Some other advantages are
2. A user-level thread does not require alteration to operating systems.
3. Straightforward Representation:
Each thread is represented simply by a registers, PC, stack and a small control block, all stored in the user process address space.
4. Fast and well-organized:
Thread switching is not much more costly than a procedure call.
5. Unproblematic Management:
This basically means that making a thread, switching between threads and synchronization between threads can all be done lacking of intervention of the kernel.

Disadvantages of User-Level Threads:
1. There is a short of coordination between threads and operating system kernel. Consequently, process as whole gets one time slice irrespective of whether process has one thread or 1000 threads within. It is up to every thread to relinquish control to other threads.
2. A user-level thread needs non-blocking systems call that means a multithreaded kernel. Or else, entire process will blocked in the kernel, even if there are run able threads left in the processes. For instance, if one thread causes a page fault, the process blocks.

Related Discussions:- definition of User-Level Thread?

Algorithm, algorithm to determine if a number is odd or even

algorithm to determine if a number is odd or even

Types of pc, TYPES OF PC:  In general,  basic function of all the comp...

TYPES OF PC:  In general,  basic function of all the computers is same i.e. Computers accept data as input, perform operations on these data and generates the desired output t

Define the elements of contlor unit , The three main elements of the con...

The three main elements of the control unit are: 1. Decoder this is used to decode the instructions that create a program when they are being processed, and to establish in what ac

Kids, how do you let kids learn on it

how do you let kids learn on it

Magnetic core memory, MAGNETIC CORE MEMORY: This type of memory is used...

MAGNETIC CORE MEMORY: This type of memory is used extensively in airborne digital systems, although integrated circuits are being developed with most modern aircraft systems.

Meaning of primary data, Problem 1 Research designs have a critical and...

Problem 1 Research designs have a critical and directive role to play in the research process. Explain the meaning of research design. Describe the various types of research de

Probability, Mike sells on the average 15 newspapers per week (Monday – Fri...

Mike sells on the average 15 newspapers per week (Monday – Friday). Find the probability that 2.1 In a given week he will sell all the newspapers [7] 2.2 In a given day he will sel

Twisted pairs, Twisted Pairs: Twisted pairs are familiar to all of us ...

Twisted Pairs: Twisted pairs are familiar to all of us as the copper wire telephone lines. These are of low frequency, and support a limited bandwidth (one voice channel) but

Write a note on file permissions on linux, Question 1 Write a note on a...

Question 1 Write a note on advantages and disadvantages of Linux 2 Write a note on "File Permissions" on linux 3 Explain the usage of following Linux commands Cd kill

Explain distributed file systems, Question 1 Write short note on          ...

Question 1 Write short note on                             1) NFS 2) CIFS Question 2 What is Virtual Application? Write down the benefits and drawbacks of it Questi

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd