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Explain the concept of Reentrancy?
It is a useful, memory-saving method for multiprogrammed timesharing systems. A Reentrant Procedure is one in which many users can share a single copy of a program during the similar period. Reentrancy has 2 key aspects: The program code cannot change itself, and the local data for each user process must be kept separately.
Therefore, the permanent part is the code, and the temporary part is the pointer back to the calling program and local variables used by that program. Each implementation instance is called activation. It implements the code in the permanent part, but has its own copy of local variables/parameters. The temporary part associated with each activation is the activation record.
five major activities on file management in operating system.? Explain it.?
Grouping Threads That Execute Similar Functions Thread Groups are generally used to group threads that execute similar functions of the application program. For instance, if
Determine the reasons for Poor response time Process busy or High I/O rates or High paging rates
FIFO page replacement This is the easiest page replacement algorithm. At this juncture the 1 st page entering is the 1 st to leave that is the oldest page leaves. To execute
Some CPUs provide for more than two modes of operation. What are two possible uses of these multiple modes?
What are the phases of background processing? Phases are:- Job Scheduling. Job Processing. Job Overview.
KERNEL-LEVEL THREADS (KLT) In this level every thread management is done by kernel .No thread library except an API system calls to the kernel thread facility exists. The kern
What are threads? A thread - sometimes called as an implementation context or a lightweight process - is a single sequential flow of control within a program. We use threads
A system consists of 10 units of resource class Ru. The resource needs of three user processes P1, P2 and P3 are like this Using Banker's algorithm, de
List the task regions in the Spiral model. Customer communication - In this region it is suggested to set up customer communication. Planning - All planning activities
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