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