sys/src/sysparprc.c

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// _Id: sysparprc.c,v 1.5 2009-05-16 16:59:44 roart Exp $
// _Locker:  $

// Author. Roar Thronæs.
/**
   \file sysparprc.c
   \brief system service for rescheduling
   \author Roar Thronæs
*/

#include<linux/linkage.h>
#include<linux/sched.h>
#include<asm/hw_irq.h>
#include<system_data_cells.h>
#include<ipldef.h>
#include<ipl.h>
#include<phddef.h>
#include <sch_routines.h>
#include<internals.h>

/**
   \brief reschedule system service - see 5.2 13.4.2
*/

asmlinkage void exe_resched(void) {
  int ipl=getipl();
  struct _pcb * p;
  setipl(IPL__SCHED);
  /** acquire sched spinlock */
  vmslock(&SPIN_SCHED,-1);

  /** record onqtime */
  p=ctl_gl_pcb;
  p->pcb_l_onqtime=exe$gl_abstim_tics;

  /** call change_cur_priority */
  sch_change_cur_priority(p, p->pcb$b_prib);

  /** rescheduling interrupt */
  SOFTINT_RESCHED_VECTOR;

  /** release sched spinlock */
  vmsunlock(&SPIN_SCHED,-1);
  setipl(ipl);
  /** return value - MISSING */
}

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