Cooperative work support is introduced since many concurrent workspaces may contain and change the same objects (files). So, there are needs to synchronize objects and control concurrent work. It is also important since the duration of an activity can be very long, which means the files would be locked for too long and severe dead lock would occur, to solve this problem, merge algorithm is used to resynchronizing objects.
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“Then we grow up to be Daddy. Domesticated men with undomesticated, frontier dreams. Suddenly life—or is it the children?—is not as cooperative as it ought to be. It’s tough to be in command of anything when a baby is crying or a ten-year-old is in despair. It’s tough to feel a sense of control when you’ve got to stop six times during the half-hour ride to Grandma’s.”
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—Henry David Thoreau (1817–1862)