rom/exec/reschedule.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8
   9 #include <exec/types.h>
  10 #include <exec/execbase.h>
  11 #include <aros/libcall.h>
  12 #include <aros/atomic.h>
  13 #include <proto/kernel.h>
  14
  15 #include "exec_intern.h"
  16
  17 /*****************************************************************************
  18
  19     NAME */
  20 #include <proto/exec.h>
  21
  22         AROS_LH0(void, Reschedule,
  23
  24 /*  SYNOPSIS */
  25
  26 /*  LOCATION */
  27         struct ExecBase *, SysBase, 8, Exec)
  28
  29 /*  FUNCTION
  30         Give up the CPU time to other tasks (if there are any).
  31
  32     INPUTS
  33         None
  34
  35     RESULT
  36         None
  37
  38     NOTES
  39         This function was private in AmigaOS(tm) up to v3.1. There's no guarantee
  40         that it will continue to exist in other systems.
  41
  42     EXAMPLE
  43
  44     BUGS
  45
  46     SEE ALSO
  47
  48     INTERNALS
  49
  50     HISTORY
  51
  52 ******************************************************************************/
  53 {
  54     AROS_LIBFUNC_INIT
  55
  56     AROS_ATOMIC_OR(SysBase->AttnResched, ARF_AttnSwitch);       /* Set scheduling attention */
  57
  58     if (SysBase->TDNestCnt < 0)                 /* If task switching enabled */
  59     {
  60         if (SysBase->IDNestCnt < 0)             /* And interrupts enabled */
  61         {
  62             D(bug("[Reschedule] Calling scheduler, KernelBase 0x%p\n", KernelBase));
  63             KrnSchedule();                      /* Call scheduler */
  64         }
  65         /*
  66          * FIXME: On m68k-amiga we should request software interrupt here.
  67          * Next Enable() will actually enable interrupts, and the interrupt should
  68          * happen instantly, with no delay. kernel.resource will see ARF_AttnSwitch
  69          * flag and perform rescheduling.
  70          *
  71          * On other machines we emulate this explicitly in our Enable() function.
  72          * There we will check AttnResched value we just set.
  73          *
  74         else
  75         {
  76
  77         } */
  78     }
  79
  80     AROS_LIBFUNC_EXIT
  81 } /* Reschedule */