rom/disk/getunit.c

   1 /*
   2     Copyright © 2010, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: GetUnit() function.
   6     Lang: english
   7 */
   8
   9 #include <proto/disk.h>
  10 #include <proto/exec.h>
  11 #include <resources/disk.h>
  12
  13 AROS_LH1(struct DiscResourceUnit*, GetUnit,
  14          AROS_LHA(struct DiscResourceUnit*, unitPointer, A1),
  15          struct DiscResource *, DiskBase, 3, Disk)
  16 {
  17     AROS_LIBFUNC_INIT
  18
  19     struct DiscResourceUnit *old = DiskBase->dr_Current;
  20
  21         Disable();
  22         if (DiskBase->dr_Flags & DRF_ACTIVE) {
  23                 AddTail(&DiskBase->dr_Waiting, &unitPointer->dru_Message.mn_Node);
  24                 Enable();
  25                 return NULL;
  26         }
  27         DiskBase->dr_Flags |= DRF_ACTIVE;
  28         DiskBase->dr_Current = unitPointer;
  29         DiskBase->dr_CurrTask = FindTask(0);
  30         if (!old)
  31                 old = DiskBase->dr_Current;
  32         Enable();
  33         return old;
  34
  35     AROS_LIBFUNC_EXIT
  36 }