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System calls and preemption


I need to make the following changes to write system call...

sys_write()
{
  if (some condition)
       reschedule the process (preempt)
  else
       whatever write does
}

The problem is how do I reschedule the process ? By the time I know that any process issued a write(), I'm switched to kernel mode! Do I need to decrement the instruction pointer (eip register on x86) and reschedule it ? Or is there some better way to do the same ? 

TIA
-siddharth

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