about 'kernel.sched_schedule'

hi,all
  
 in the line of 'kernel.sched_schedule' trace, there are three important items:
 1.prev_pid;2.next_pid;3.prev_state
  
 in one of my trace file , I find prev_state has 4 values:-1,0,1,2
 I just get the following info: -1 unrunnable, 0 runnable, >0 stopped
  
 what I want to know is the exactly meaning of the 4 values,
 is there anybody can tell me ?
  
 thank u very much!

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