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List sample file types, based on use, on the VAX under VMS.
source programs (.BAS, .FOR, .COB, .PLI, .PAS, .MAR)
data files (.DAT)
text files (.TXT)
command procedures (.COM)
mail files (.MAI)
compiler-listing files (.LIS, .LST)
object files (.OBJ)
executable image files (.EXE)
journal files (.JOU)
How is a process chosen for being swapped either in or out? Swap out: a. If the process is idle. b. If process has been in main memory for a long time.
Synchronization serves two purposes: 1) to ensure safety for updates on shared data (e.g. to avoid races conditions), and 2) to coordinate and order actions taken by threads (e.g.
Q. Several CPUs provide for more than two modes of operation. What are two probable uses of these multiple modes? Answer: Although most systems merely distinguish between use
What is the main function of the memory-management unit? The runtime mapping from virtual to physical addresses is done by a hardware device known as a memory management unit (
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 a file? A named collection of related data explained by the creator, recorded on secondary storage.
Q. Consider the two-dimensional array A: int A[][] = new int[100][100]; Whereas A [0][0] is at location 200 in a paged memory system with pages of size 200. A little process
Explain the different sections of a process. Entry section Critical section Exit section Remainder section Consider a system inclusive of n processe
scattered resposibi;ity and authority -necessity of operation research
how are you
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