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Computer multitasking
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== Real time == Another reason for multitasking was in the design of [[real-time computing]] systems, where there are a number of possibly unrelated external activities needed to be controlled by a single processor system. In such systems a hierarchical interrupt system is coupled with process prioritization to ensure that key activities were given a greater share of available [[process time]].<ref>{{Cite journal |last1=Liu |first1=C. L. |last2=Layland |first2=James W. |date=1973-01-01 |title=Scheduling Algorithms for Multiprogramming in a Hard-Real-Time Environment |journal=Journal of the ACM |volume=20 |issue=1 |pages=46β61 |doi=10.1145/321738.321743 |s2cid=59896693 |issn=0004-5411|doi-access=free }}</ref>
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