xenocara/xserver/include/callback.h

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

Copyright 1987, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
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in this Software without prior written authorization from The Open Group.


Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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******************************************************************/

#ifndef CALLBACK_H
#define CALLBACK_H

#include <X11/X.h>	/* for GContext, Mask */
#include <X11/Xdefs.h>	/* for Bool */
#include <X11/Xproto.h>
#include <X11/Xfuncproto.h>

/*
 *  callback manager stuff
 */

#ifndef _XTYPEDEF_CALLBACKLISTPTR
typedef struct _CallbackList *CallbackListPtr; /* also in misc.h */
#define _XTYPEDEF_CALLBACKLISTPTR
#endif

typedef void (*CallbackProcPtr) (
    CallbackListPtr *, pointer, pointer);

extern _X_EXPORT Bool AddCallback(
    CallbackListPtr * /*pcbl*/,
    CallbackProcPtr /*callback*/,
    pointer /*data*/);

extern _X_EXPORT Bool DeleteCallback(
    CallbackListPtr * /*pcbl*/,
    CallbackProcPtr /*callback*/,
    pointer /*data*/);

extern _X_EXPORT void _CallCallbacks(
    CallbackListPtr * /*pcbl*/,
    pointer /*call_data*/);

static inline void
CallCallbacks(CallbackListPtr *pcbl, pointer call_data)
{
    if (!pcbl || !*pcbl) return;
    _CallCallbacks(pcbl, call_data);
}

extern _X_EXPORT void DeleteCallbackList(
    CallbackListPtr * /*pcbl*/);

extern _X_EXPORT void InitCallbackManager(void);

#endif /* CALLBACK_H */