rom/exec/freesignal.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Free a signal.
   6     Lang: english
   7 */
   8 #include <exec/execbase.h>
   9 #include <exec/tasks.h>
  10 #include <aros/libcall.h>
  11 #include <proto/exec.h>
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16
  17         AROS_LH1(void, FreeSignal,
  18
  19 /*  SYNOPSIS */
  20         AROS_LHA(LONG, signalNum, D0),
  21
  22 /*  LOCATION */
  23         struct ExecBase *, SysBase, 56, Exec)
  24
  25 /*  FUNCTION
  26         Free a signal allocated with AllocSignal().
  27
  28     INPUTS
  29         signalNum - Number of the signal to free or -1 to do nothing.
  30
  31     RESULT
  32
  33     NOTES
  34
  35     EXAMPLE
  36
  37     BUGS
  38
  39     SEE ALSO
  40         AllocSignal(), Signal(), Wait()
  41
  42     INTERNALS
  43
  44 ******************************************************************************/
  45 {
  46     AROS_LIBFUNC_INIT
  47
  48     if(signalNum!=-1)
  49     {
  50         #warning "Forbid/Permit or atomic operation should not be needed here"
  51         #warning "Because AllocSignal/FreeSignal access tc_SigAlloc only ever from same task?"
  52
  53         /* Nobody guarantees that the compiler will make it atomic. */
  54         Forbid();
  55
  56         /* Clear the bit */
  57         SysBase->ThisTask->tc_SigAlloc&=~(1<<signalNum);
  58         Permit();
  59     }
  60     AROS_LIBFUNC_EXIT
  61 } /* FreeSignal() */
  62