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 <proto/exec.h>
  10 #include <graphics/gfxbase.h>
  11 #include <exec/tasks.h>
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <proto/graphics.h>
  17
  18         AROS_LH0(void, DisownBlitter,
  19
  20 /*  SYNOPSIS */
  21
  22
  23 /*  LOCATION */
  24         struct GfxBase *, GfxBase, 77, Graphics)
  25
  26 /*  FUNCTION
  27         The blitter is returned to usage by other tasks.
  28
  29     INPUTS
  30
  31     RESULT
  32
  33     NOTES
  34
  35     EXAMPLE
  36
  37     BUGS
  38
  39     SEE ALSO
  40         DisownBlitter()
  41
  42     INTERNALS
  43
  44     HISTORY
  45
  46 ******************************************************************************/
  47 {
  48   /* if there are no blits in any of the two queues (QBlit() and QBSBlit())
  49      then check whether there is a Task in the BlitWaitQ and put it into
  50      the TaskReadyList.
  51    */
  52
  53   AROS_LIBFUNC_INIT
  54
  55   Forbid();
  56
  57   GfxBase -> BlitOwner = NULL;
  58
  59   if (NULL == GfxBase->  blthd &&
  60       NULL == GfxBase->bsblthd)
  61   {
  62      if((struct Node *) GfxBase->BlitWaitQ.lh_Head !=
  63         (struct Node *)&GfxBase->BlitWaitQ.lh_TailPred )
  64      {
  65        /* make that task ready again! */
  66        struct Task * first = (struct Task *)RemHead(&GfxBase->BlitWaitQ);
  67        first->tc_State = TS_READY;
  68        /* Put it into the correct list of tasks */
  69        Reschedule(first);
  70      }
  71   }
  72   else
  73   {
  74     /* let the interrupt handler start the queued blitter requests */
  75   }
  76
  77   Permit();
  78
  79   AROS_LIBFUNC_EXIT
  80 } /* DisownBlitter */