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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)
DIFFERENT MULTITHREADING MODELS Multithreading Models the majority multithreading models fall into one of the following categories of threading implementation: 1. M
Explain about deadlock prevention? In order for the occurrence of deadlock, the four conditions like mutual exclusion, hold and wait, no pre-emption and circular wait must hap
This exercise uses a graph-plotting program ( gnuplot ) to convert tabular data into an image. This is a technique that is very widely used to visualize scientific data; with app
How can the index blocks be implemented in the indexed allocation scheme? The index block can be implemented as follows a. Multilevel scheme b. Linked scheme c. Combin
Clocks in distributed systems : a. Why are clocks difficult to synchronize in distributed systems? b. What features in a system assume that the clocks are (reasonably) synchr
Q. Is disk scheduling except FCFS scheduling useful in a single-user environment? describe your answer. Answer: In a single-user environment the I/O queue typically is empty.
What is the use of fork and exec system calls? Fork is a system call by which a latest process is created. Exec is also a system call, which is used after a fork by one of the
QUICK FIT ALGORITHAMS Here we keep apart lists for holes and processes. Therefore this reduces the searching time for holes Hole list and Process list. If we organize the li
Hierarchical paging Single way is to use a two-level paging algorithm, in which the page table itself is also paged. A logical address is separated into a page number and a pag
The term IPC (Inter-Process Communication) defines several paths by which different process executing on some operating system interact between each other.
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