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do_schedule() cleanup

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- it is not neccessary to test whether the scheduler is a system
  process as the process already head permissions to make this call.

- it is better to test whether the scheduler has permission to make
  changes to this process before testing whether the values are valid.
This commit is contained in:
Tomas Hruby 2010-04-10 15:17:09 +00:00
parent 65ef539739
commit 485a037563
1 changed files with 4 additions and 8 deletions
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12
kernel/system/do_schedule.c
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@ -12,19 +12,15 @@ PUBLIC int do_schedule(struct proc * caller, message * m_ptr)
p = proc_addr(_ENDPOINT_P(m_ptr->SCHEDULING_ENDPOINT));
/* Only this process' scheduler can schedule it */
if (caller != p->p_scheduler)
return(EPERM);
/* Make sure the priority number given is within the allowed range.*/
if (m_ptr->SCHEDULING_PRIORITY < TASK_Q ||
m_ptr->SCHEDULING_PRIORITY > NR_SCHED_QUEUES)
return(EINVAL);
/* Only system processes can schedule processes */
if (! (priv(caller)->s_flags & SYS_PROC))
return(EPERM);
/* Only this process' scheduler can schedule it */
if (caller != p->p_scheduler)
return(EPERM);
/* In some cases, we might be rescheduling a runnable process. In such
* a case (i.e. if we are updating the priority) we set the NO_QUANTUM
* flag before the generic unset to dequeue/enqueue the process