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:
“To see ourselves as others see us can be eye-opening. To see others as sharing a nature with ourselves is the merest decency. But it is from the far more difficult achievement of seeing ourselves amongst others, as a local example of the forms human life has locally taken, a case among cases, a world among worlds, that the largeness of mind, without which objectivity is self- congratulation and tolerance a sham, comes.”
—Clifford Geertz (b. 1926)
“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)
“By sharing the information and observations with the caregiver, you have a chance to see your child through another pair of eyes. Because she has some distance and objectivity, a caregiver often sees things that a parent’s total involvement with her child doesn’t allow.”
—Amy Laura Dombro (20th century)