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__switch_to()

Hi, when the OS task switches, it calls __switch_to(prev, next) function 
in arch/i386/kernel/process.c.  I was just curious about the parameters 
prev and next.  Normally, I would expect the pid of prev and next in 
successive calls to __switch_to() to be like the following:

prev->pid: 0, next->pid: 100
prev->pid: 100, next->pid: 20
prev->pid: 20, next->pid 0
prev->pid: 0, next->pid 20

where the previous next->pid will be the same as the current prev->pid.  
I am wondering whether it is possible to have this constraint violated in 
any case?  For instance, when a task terminates?  Thanks.

-
Hai

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