Explain the per thread scoping, Operating System

Assignment Help:

Explain the Per Thread Scoping

Thread-level programming introduces new twists for application-level variable scoping. Threads are commonly used in one of two ways.

  • To execute independent parts of the application program
  • To execute similar application functions on a per-user basis

 

In the latter case, any global variables used by the threads may be subject to modification by more than one thread at a time. Disastrous results may occur if this is left unchecked.

Since threads are potentially executing  the same procedures within an application. Or accessing similar data, per-thread data items may be required.

A common practice in a multithreaded program is  to repentantly call application functions on a per-user or per-function basis. In order to make a function reentrant, variables within the function must either be local or have sterilized access to global data. When executing functions on be half of a user, however, these functions may need access to some user contextual data.

The application developer has one of two choices to make:

  • A variable could be passed to the functions representing an index into a user data structure or a pointer to user data. This is cumbersome, however, because that same variable will need to be passed to each subsequent function so that its scope is visible to application components down the line.
  • The developer can set up a similar variable with the global application scope but with per-threads access. The user data must be unique for each thread and be globally addressable by application functions.

Related Discussions:- Explain the per thread scoping

Business, why some companies do not pay sufficient attention to staff induc...

why some companies do not pay sufficient attention to staff induction

Briefly explain about file system implementation, Briefly explain about fil...

Briefly explain about file system implementation? Several on-disk and in-memory structures are used to execute a file system. On disk, the file system may have information abou

What are the system components of an operating system, What are the system ...

What are the system components of an operating system and explain them? a) Process management b) Main-memory management c) I/O management d) File management e) Seco

Compression regarding the file system in windows 2000, Write short note on ...

Write short note on compression regarding the file system in Windows 2000. NTFS is able to perform data compression on individual files or on all data files in a directory. To

History of operating systems, Operating Systems have evolved tremendously i...

Operating Systems have evolved tremendously in the last few decades. The first approach for building Operating Systems, taken during the 40s through early 60s, was to allow only on

Explain worst fit algorithm, Worst Fit Algorithm Here we obtain the la...

Worst Fit Algorithm Here we obtain the largest space available for the smallest. Therefore after that process entered there will be much more space remaining. In this space we

What is internal fragmentation?, What is internal fragmentation? Consid...

What is internal fragmentation? Consider holes of 20k assume the process requests 18 bites. If we allocate accurately the request block, we are left with a hole of 2k. The over

Elimination of common sub expression - code optimizatin, Elimination of com...

Elimination of common sub expression during code optimization An optimizing transformation is a rule for rewriting a section of a program to enhance its execution efficiency wi

What is a sequential file, What is a sequential file? A file that is re...

What is a sequential file? A file that is read one record or block or parameter at a time in order, based on a tape model of a file.

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