sys/src/syssetpri.c

Go to the documentation of this file.

// _Id: syssetpri.c,v 1.9 2009-05-16 16:59:44 roart Exp $
// _Locker:  $

// Author. Roar Thronæs.
/**
   \file syssetpri.c
   \brief system service set priority
   \author Roar Thronæs
*/

#include<linux/unistd.h>
#include<linux/linkage.h>
#include<linux/sched.h>
#include<starlet.h>
#include<ssdef.h>
#include<evtdef.h>
#include<pridef.h>
#include <exe_routines.h>
#include <sch_routines.h>

/* Author: Roar Thronæs */

asmlinkage int exe_setpri_wrap(struct struct_setpri *s) {
  return exe_setpri(s->pidadr,s->prcnam,s->pri,s->prvpri,s->pol,s->prvpol);
}

/**
   \brief set priority - see 5.2 13.4.1
*/

asmlinkage int exe_setpri(unsigned int *pidadr, void *prcnam, unsigned int pri, unsigned int *prvpri, unsigned int*pol, unsigned int *prvpol) {
  struct _pcb *p;
  struct _pcb * retpcb;
  unsigned long ipid, epid;
  int sts;
  /** locate process by nampid */
  sts=exe_nampid(current,pidadr,prcnam,&retpcb,&ipid,&epid);
  p=retpcb;

  /** cwps - MISSING */

  if (!p) p=current;

  /** set prisav, pribsav - MISSING */
  /** set prib */
  p->pcb_b_prib=31-pri;

  /** if current process, call change cur priority */
  if (p==current)
    sch_change_cur_priority(p, p->pcb$b_prib);

  /** call rse */
  sch_rse(p,PRI$_IOCOM,EVT$_SETPRI);

  return SS__NORMAL;
}

---