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| n | Program A
wants to copy from disk1 to |
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| disk2 and
takes control of disk1 |
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| n | Program B
wants to copy from disk2 to |
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| disk1 and
takes control of disk2 |
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| n | Program A must
wait that program B |
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| releases disk2
and program B must wait |
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| that program A
releases disk1 |
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| n | Program A and
B will wait forever |
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