UNIX system is due to the multiple user system, CPU time allocated to each unit users, but in essence, it should be said that the CPU time allocated to the unit for the use of various processes, each process has its own operating environment to enable the CPU to do when the switching process will not "forget" the process has been calculated half of the "semi-finished products."

Packet : 91332011cpp.rar.rar filelist
cpp.zip.txt

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