rom/graphics/disownblitter.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Release the bitter from private usage
   6     Lang: english
   7 */
   8
   9 #include <aros/debug.h>
  10
  11 #include <proto/exec.h>
  12 #include <graphics/gfxbase.h>
  13 #include <exec/tasks.h>
  14
  15 #include "graphics_intern.h"
  16 #include "gfxfuncsupport.h"
  17
  18 /*****************************************************************************
  19
  20     NAME */
  21 #include <proto/graphics.h>
  22
  23         AROS_LH0(void, DisownBlitter,
  24
  25 /*  SYNOPSIS */
  26
  27
  28 /*  LOCATION */
  29         struct GfxBase *, GfxBase, 77, Graphics)
  30
  31 /*  FUNCTION
  32         The blitter is returned to usage by other tasks.
  33
  34     INPUTS
  35
  36     RESULT
  37
  38     NOTES
  39
  40     EXAMPLE
  41
  42     BUGS
  43
  44     SEE ALSO
  45         DisownBlitter()
  46
  47     INTERNALS
  48
  49     HISTORY
  50
  51 ******************************************************************************/
  52 {
  53   AROS_LIBFUNC_INIT
  54
  55   /* Debugging disabled, this function must be callable from blitter interrupt.
  56    * FIXME: better solution?
  57    */
  58
  59 #if 0
  60   struct Task *me = FindTask(NULL);
  61
  62   D(bug("DisownBlitter: Release by Task %p\n", me));
  63
  64   if (GfxBase->BlitOwner != me) {
  65     D(bug("DisownBlitter: Owned by Task %p, but Task %p is releasing it!\n",
  66       GfxBase->BlitOwner, me));
  67   }
  68
  69   if (NULL != GfxBase->blthd && NULL != GfxBase->bsblthd)
  70   {
  71     D(bug("DisownBlitter: OOPS! Disowning while queued enties are in play!\n"));
  72   }
  73 #endif
  74
  75   Disable();
  76
  77   GfxBase->BlitOwner = NULL;
  78   /* Do we have any waiting tasks? */
  79   if (!IsListEmpty(&GfxBase->BlitWaitQ)) {
  80     /* Wake up next OwnBlitter() waiting task */
  81     struct BlitWaitQNode *node = (struct BlitWaitQNode*)GfxBase->BlitWaitQ.lh_Head;
  82     D(bug("DisownBlitter: Waking task %p\n", node->task));
  83     Signal(node->task, 1 << SIGB_BLIT);
  84   }
  85
  86   Enable();
  87
  88 #if 0
  89   D(bug("DisownBlitter: Released by Task %p\n", me));
  90 #endif
  91
  92   AROS_LIBFUNC_EXIT
  93 } /* DisownBlitter */