minix/kernel/system/do_schedule.c

   1 #include "kernel/system.h"
   2 #include <minix/endpoint.h>
   3 #include "kernel/clock.h"
   4
   5 /*===========================================================================*
   6  *                              do_schedule                                  *
   7  *===========================================================================*/
   8 int do_schedule(struct proc * caller, message * m_ptr)
   9 {
  10         struct proc *p;
  11         int proc_nr;
  12         int priority, quantum, cpu, niced;
  13
  14         if (!isokendpt(m_ptr->m_lsys_krn_schedule.endpoint, &proc_nr))
  15                 return EINVAL;
  16
  17         p = proc_addr(proc_nr);
  18
  19         /* Only this process' scheduler can schedule it */
  20         if (caller != p->p_scheduler)
  21                 return(EPERM);
  22
  23         /* Try to schedule the process. */
  24         priority = m_ptr->m_lsys_krn_schedule.priority;
  25         quantum = m_ptr->m_lsys_krn_schedule.quantum;
  26         cpu = m_ptr->m_lsys_krn_schedule.cpu;
  27         niced = !!(m_ptr->m_lsys_krn_schedule.niced);
  28
  29         return sched_proc(p, priority, quantum, cpu, niced);
  30 }