In linux 2.4 the kernel is non-preemptive
That is, at any time, a process running in kernel mode can not be preempted by another user process, right?
Consider a user process issue a syscall, trap into kernel and when it stay in kernel mode, the timer interrupt comes and
the process find the its own time quantum is used up(task_struct->counter <=0)
it should be schduled out after timer interrupt complete, right?
then , if another user process scheduled to run issue a syscall, what happen?
is it allowed to trap into kernel?
if no, what mechanism used here ?
