2014329620086-huangjiang-hk1 (28.218.81608.81609.81613.222.81848.81864)
When several programs arerunning at the same time,it needs to share system resources, which leads to the program in the execution of restraining each other.The execution of program perform from time to time.These features appear in the process of the execution of the program and are dynamic process.But the traditional program is the set of instructions and is a static concept.It can't describe the program in memory.In another way,we can't see when it runs and when it stops only occording to the surface,and we can't see the relationship among them.So program can't reflect the the characteristics of the concurrent execution program.In order to deeply describe the nature of the dynamic process of program executions,we introduced a concept Process.
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