Sharing
In multi-programming or in multi-user environment it is common for many users to be executing the same program. If individual copies of these programs were given to each user, much of the primary storage would be wasted. Its solution is to share those pages that can be shared.
Sharing must be carefully controlled to prevent one process from modifying data that another process is accessing. In most systems the shared programs are divided into separate pages i.e. coding and data are kept separate. This is achieved by having page map table entries of different processes point to the same page frame, that page frame is shared among those process.
Read more about this topic: Paging
Famous quotes containing the word sharing:
“Eventually we will learn that the loss of indivisible love is another of our necessary losses, that loving extends beyond the mother-child pair, that most of the love we receive in this world is love we will have to share—and that sharing begins at home, with our sibling rivals.”
—Judith Viorst (20th century)
“I go for all sharing the privileges of the government, who assist in bearing its burthens.”
—Abraham Lincoln (1809–1865)
“So close is the bond between man and woman that you can not raise one without lifting the other. The world can not move ahead without woman’s sharing in the movement, and to help give a right impetus to that movement is woman’s highest privilege.”
—Frances Ellen Watkins Harper (1825–1911)