arch/i386-darwin/exec/switch.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Unix version  of Switch().
   6     Lang: english
   7 */
   8
   9 #include <exec/execbase.h>
  10 #include <proto/exec.h>
  11 #include <proto/kernel.h>
  12 #include <aros/kernel.h>
  13 #include <proto/arossupport.h>
  14
  15 AROS_LH0(void, Switch,
  16     struct ExecBase *, SysBase, 9, Exec)
  17 {
  18     AROS_LIBFUNC_INIT
  19
  20     struct Task *this = SysBase->ThisTask;
  21
  22   KRNWireImpl(SoftEnable);
  23   KRNWireImpl(SoftDisable);
  24   KRNWireImpl(SoftCause);
  25
  26         /*
  27         If the state is not TS_RUN then the task is already in a list
  28     */
  29
  30     Disable();
  31
  32     if( this->tc_State != TS_RUN )
  33     {
  34
  35         /*      Its quite possible that they have interrupts Disabled(),
  36                 we should fix that here, otherwise we can't switch.
  37
  38                 We can't call the dispatcher because we need a signal,
  39                 lets just create one.
  40
  41                 Have to set the dispatch-required flag.
  42                 I use SIGUSR1 (maps to SoftInt) because it has less effect on
  43                 the system clock, and is probably quicker.
  44         */
  45
  46           /* We now re-enable software interrupts. */
  47           CALLHOOKPKT(krnSoftEnableImpl,0,0);
  48         SysBase->AttnResched |= 0x8000;
  49           CALLHOOKPKT(krnSoftCauseImpl,0,0);
  50           /* Disable software interrupts */
  51           CALLHOOKPKT(krnSoftDisableImpl,0,0);
  52
  53     }
  54
  55     Enable();
  56
  57     AROS_LIBFUNC_EXIT
  58 } /* Switch() */