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Q. Example of shared programming using library routines?
Think about subsequent set of statements
Process A Process B
: :
fork B; :
Join B; end B;
In the above group of statements process A creates a child process B by statement fork B. Then A and B carry on their computations separately till A reaches join statement At this phase if B is already completed then A continues executing subsequent statement or else it waits for B to complete.
In the shared memory model a general problem is to synchronize the processes. It can be possible that more than one process is trying to concurrently edit the same variable. To solve this problem numerous synchronization mechanism such as test_and_set, semaphores and monitors have been used. We will not go in the details of these mechanisms. Rather we will symbolize them by a pair of two processes known as lock and unlock. Whenever a process P locks a common variable then only P can use that variable.
Other simultaneous processes have to wait for common variable till P calls the unlock on that variable. Let's see effect of locking on output of a program when we don't employ lock and when we employ lock.
Q. Concurrently read exclusively write? It's one of the models based on PRAM. In this model, processors access the memory location simultaneously for reading whereas exclusivel
UDP (User Diagram Protocol) is? It is both Connectionless and Message Oriented.
Q. Explain Call and Return Statements? CALL: CALL X Procedure Call to procedure/function named X CALL instruction causes the following to happen: 1. Decre
Next add a layout cell for the Learn More About graphic. 1. In Objects panel, click the Draw Layout Cell icon. 2. In Document window, draw a new cell in the space below nav
As per the JMS specification, when you are in a transaction, the acknowledge Mode is ignored. If acknowledge() is known as within a transaction, it is ignored.
difference between lexical & semantic expansion
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Q. Illustrate Single In-line Memory Modules? From early days of semiconductor memory till the early 1990s memory was manufactured, brought and installed as a single chip. Chip
Accessing the Operands: operands are usually place in one of two places: -registers (32 int, 32 fp) -memory (232locations) registers are -simple to spe
Example of circuit switching and S&F (Stored and Forward) switching is (A) Telephone and Post of Telegraph (B) Video Signal Post or Telegraph (C) Digital Signal P
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