rom/hyperlayers/locklayer.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8 #include <aros/libcall.h>
   9 #include <proto/exec.h>
  10
  11 #define DEBUG 0
  12 #include <aros/debug.h>
  13 #undef kprintf
  14
  15 /*****************************************************************************
  16
  17     NAME */
  18 #include <proto/layers.h>
  19 #include "layers_intern.h"
  20
  21         AROS_LH2(void, LockLayer,
  22
  23 /*  SYNOPSIS */
  24         AROS_LHA(LONG          , dummy, A0),
  25         AROS_LHA(struct Layer *, layer, A1),
  26
  27 /*  LOCATION */
  28         struct LayersBase *, LayersBase, 16, Layers)
  29
  30 /*  FUNCTION
  31         Locks a layer for exclusive access by this task.
  32         A layer can be locked multiple times but has to be unlocked
  33         as many times as it has been locked so that other tasks
  34         can access it.
  35
  36     INPUTS
  37         dummy - unused.
  38         layer - pointer to layer to be locked
  39
  40     RESULT
  41
  42     NOTES
  43
  44     EXAMPLE
  45
  46     BUGS
  47
  48     SEE ALSO
  49
  50     INTERNALS
  51
  52 *****************************************************************************/
  53 {
  54     AROS_LIBFUNC_INIT
  55
  56     D(bug("LockLayer(layer @ $%lx)\n", layer));
  57
  58     ObtainSemaphore(&layer->Lock);
  59
  60     AROS_LIBFUNC_EXIT
  61 } /* LockLayer */