arch/all-unix/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
  12 #include <stdlib.h>
  13 #include <signal.h>
  14 #include <unistd.h>
  15 #include <stdio.h>
  16
  17 extern sigset_t sig_int_mask;
  18
  19 AROS_LH0(void, Switch,
  20     struct ExecBase *, SysBase, 9, Exec)
  21 {
  22     AROS_LIBFUNC_INIT
  23
  24     struct Task *this = SysBase->ThisTask;
  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 #if 0
  35         if( SysBase->IDNestCnt >= 0 )
  36         {
  37                 sigprocmask(SIG_UNBLOCK, &sig_int_mask, NULL);
  38         }
  39 #endif
  40         sigset_t temp_sig_int_mask;
  41
  42         sigemptyset(&temp_sig_int_mask);
  43         sigaddset( &temp_sig_int_mask, SIGUSR1);
  44
  45         /*      Its quite possible that they have interrupts Disabled(),
  46                 we should fix that here, otherwise we can't switch.
  47
  48                 We can't call the dispatcher because we need a signal,
  49                 lets just create one.
  50
  51                 Have to set the dispatch-required flag.
  52                 I use SIGUSR1 (maps to SoftInt) because it has less effect on
  53                 the system clock, and is probably quicker.
  54         */
  55
  56         sigprocmask(SIG_UNBLOCK, &temp_sig_int_mask, NULL);
  57         SysBase->AttnResched |= 0x8000;
  58         kill(getpid(), SIGUSR1);
  59         sigprocmask(SIG_BLOCK, &temp_sig_int_mask, NULL);
  60
  61     }
  62
  63     Enable();
  64
  65     AROS_LIBFUNC_EXIT
  66 } /* Switch() */