Run: (1) when a process execution on the processing, has said, the process is in operation in the process of this state the number of less than or equal to the number of processors, for a single processor system, the process of running only one, when there is no other process can be performed (e.g., all processes in the blocking state), usually idle process of automated system,

(2) ready. When a process to obtain all required other than the processor resources, once you get the processor can run, says the process is in the ready state, ready process can be divided queue according to the multiple priority, for example, when a process due to time out into the ready state, into the low priority queue; When a process performed by the I/O operations into the ready state, into the high priority queue,

(3) : also called wait or sleep state, a process is waiting for an event occurs (such as I/O request and wait for the I/O completion, etc.) and temporarily stop running, then even distributing the processor to process cannot run, therefore calls the process in the blocking state,

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