events.h

7号信令功能代码,为开源代码

/*                               -*- Mode: C -*- 
 * events.h --- streams events
 * Author          :  Francisco J. Ballesteros & Graham Wheeler
 * Created On      : Tue May 31 22:25:19 1994
 * Last Modified By: Francisco J. Ballesteros
 * Last Modified On: Tue Sep 26 15:20:42 1995
 * Update Count    : 2
 * RCS Id          : events.h,v 1.1.1.1 1999/05/27 20:29:33 brian Exp
 * Usage           : see below :)
 * Required        : see below :)
 * Status          : (Exp) complete, untested, compiled
 * Prefix(es)      : lis
 * Requeriments    : 
 * Purpose         : provide streams events
 *                 : 
 * ----------------______________________________________________
 *
 *    Copyright (C) 1995  Graham Wheeler, Francisco J. Ballesteros
 *    Copyright (C) 1997  David Grothe, Gcom, Inc <[e-mail]>
 *
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Cambridge,
 * MA 02139, USA.
 * 
 *
 *    You can reach us by email to any of
 *    [e-mail], [e-mail]
 */

#ifndef _EVENTS_H
#define _EVENTS_H 1

#ident "@(#) LiS events.h 2.1 4/4/99 11:34:29 "

#ifndef _SYS_TYPES_H
#if	defined(LINUX)
#include <linux/types.h>
#else
#include <sys/types.h>
#endif
#endif

#ifdef __KERNEL__

/*  -------------------------------------------------------------------  */
/*				 Dependencies                            */

#include <sys/strconfig.h>	/* config definitions */
#include <sys/LiS/share.h>	/* generid defs */
/*  -------------------------------------------------------------------  */
/*				    Types                                */
/* Stream event info
 */
typedef
struct strevent {
    struct strevent *se_next;	/* next event for this stream or NULL*/
    struct strevent *se_prev;	/* previous event for this stream or last
				 * event if this is the first one*/
    pid_t se_pid;		/* process to be signaled */
    short se_evs;		/* events wanted */
} strevent_t;

#if 0
/* I don't know if it's a good idea to keep the strinfo structs around
 * other structs. It's good to debug memory issues, but we should reimplement
 * completelly the STREAMS memory management. 
 * I guess it would be better just to alloc raw memory pages and avoid 
 * memory fragmentation by using the knowledge of what's likely to be requested
 * what's likely to be freed and what the sizes are.
 * When one of those pages get w/ count 0 (i.e., no used chunk inside) we could
 * just give it back to the kernel.
 * More on, we could keep initialized structs in a pre-initialized state, so
 * only the very first time they're use they're filled. Later on, the initial
 * initialization process could be skipped.
 * There was an article in UNSENIX (don't remember exactly where) about this.
 * -- nemo
 */

struct strinfo {};
#endif /* 0 */

/*  -------------------------------------------------------------------  */
/*				 Glob. Vars.                             */

extern struct strevent *lis_sefreelist; /* list of free stream events */
extern struct strevent *lis_secachep;   /* reserve store of free str events */

#if 0
/* see long comment above -- nemo */
extern struct strinfo lis_strinfo[]; /* keeps track of allocated events	*/
#endif

/*  -------------------------------------------------------------------  */
/*			Exported functions & macros                      */

/* get events for pid in list
 * STATUS: complete, untested
 */
extern  short
lis_get_elist_ent( strevent_t *list, pid_t pid );

/* add event to list
 * STATUS: complete, untested
 */
extern int
lis_add_to_elist( strevent_t **list, pid_t pid, short events );

/* del event from list
 * rets non-zero if not-found
 * STATUS: complete, untested
 */
extern int
lis_del_from_elist( strevent_t **list, pid_t pid, short events );

/*
 * Free the entire elist
 */
extern void
lis_free_elist( strevent_t **list);

/*  -------------------------------------------------------------------  */
#endif /* __KERNEL__ */
#endif /*!_EVENT_H*/

/*----------------------------------------------------------------------
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# change-log-default-name: "~/src/prj/streams/src/NOTES" ***
# End: ***
  ----------------------------------------------------------------------*/