/*
    (C) 1995-96 AROS - The Amiga Replacement OS
    $Id: freesignal.c,v 1.7 1997/01/01 03:46:10 ldp Exp $
    $Log: freesignal.c,v $
    Revision 1.7  1997/01/01 03:46:10  ldp
    Committed Amiga native (support) code

    Changed clib to proto

    Revision 1.6  1996/12/10 13:51:46  aros
    Moved all #include's in the first column so makedepend can see it.

    Revision 1.5  1996/10/24 15:50:50  aros
    Use the official AROS macros over the __AROS versions.

    Revision 1.4  1996/08/13 13:56:02  digulla
    Replaced AROS_LA by AROS_LHA
    Replaced some AROS_LH*I by AROS_LH*
    Sorted and added includes

    Revision 1.3  1996/08/01 17:41:12  digulla
    Added standard header for all files

    Desc:
    Lang: english
*/
#include <exec/execbase.h>
#include <exec/tasks.h>
#include <aros/libcall.h>
#include <proto/exec.h>

/*****************************************************************************

    NAME */

	AROS_LH1(void, FreeSignal,

/*  SYNOPSIS */
	AROS_LHA(LONG, signalNum, D0),

/*  LOCATION */
	struct ExecBase *, SysBase, 56, Exec)

/*  FUNCTION
	Free a signal allocated with AllocSignal().

    INPUTS
	signalNum - Number of the signal to free or -1 to do nothing.

    RESULT

    NOTES

    EXAMPLE

    BUGS

    SEE ALSO
	AllocSignal(), Signal(), Wait()

    INTERNALS

    HISTORY

******************************************************************************/
{
    AROS_LIBFUNC_INIT

    if(signalNum!=-1)
    {
	/* Nobody guarantees that the compiler will make it atomic. */
	Forbid();

	/* Clear the bit */
	SysBase->ThisTask->tc_SigAlloc&=~(1<<signalNum);
	Permit();
    }
    AROS_LIBFUNC_EXIT
}