I want to do the following changes to write() system call...
sys_write()
{
if (some_condition)
reschedule the process at a later time (preempt)
else
do whatever write does
}
The problem is when I'm checking the condition, I'm in kernel mode, so how do I preempt the process that called write. Also, how do I access the instruction pointer (eip for x86) so that I decrement it to what it was before calling write ? I am trying to decrement the eip because, when the process is rescheduled it should issue write again (and not the "next" instruction).
Is there some other/better way of handling this ?
TIA,
-siddharth
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