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For example, by initializing a semaphore to 0, threads can wait for an event to occur, and impose an ordering constraint, similar to a monitor using condition variables, but with memory: semaphore sem=0; // 0==locked for a semaphore
thread Adown(sem) // wait for thread B; note sem has memory!// do stuffthread B// do stuff, then wake up Aup(sem)
Since most of the programs require a lot of memory allocation/deallocation, we expect the memory management to be fast, to have low fragmentation, make good use of locality, and be
define semaphore. how can we use semaphore to deal with n-process critical section problem.
mention the three problems that mat be caused by wrong initialization and placement of wait() and signal()operations in the use of semaphore
Transparency Users must be able to access remote resources as though these resources were local. Transparency should as well promote user mobility. Users must be allowed
Q. Polling for an I/O completion is able to waste a large number of CPU cycles if the processor iterates a busy-waiting loop several times before the I/O completes. However if the
Signal handling A signal is used in UNIX systems to inform a process that a particular event has occurred. 1. A signal is produced by the occurrence of a particular event.
Interval among the time of submission and completion of the job is known as Interval among the time of submission and completion of the job is known as Turn
Page Fault Handling conditions like, where the copy on write bit of a page is set and that page is send by more than one process, the Kernel assign new page and copies the conten
What are the different directory structures? Explain each type. There are five dissimilar directory structures: 1. Single level directory 2. Two level directory
explain how response time are reduced by allowing time sharing on top of multiprogramming
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