/*	$OpenBSD: rf_callback.c,v 1.1 1999/01/11 14:29:00 niklas Exp $	*/
/*	$NetBSD: rf_callback.c,v 1.1 1998/11/13 04:20:26 oster Exp $	*/
/*
 * Copyright (c) 1995 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Jim Zelenka
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

/*****************************************************************************************
 *
 * callback.c -- code to manipulate callback descriptor
 *
 ****************************************************************************************/

/* :  
 * Log: rf_callback.c,v 
 * Revision 1.11  1996/06/17 03:18:04  jimz
 * include shutdown.h for macroized ShutdownCreate
 *
 * Revision 1.10  1996/06/10  11:55:47  jimz
 * Straightened out some per-array/not-per-array distinctions, fixed
 * a couple bugs related to confusion. Added shutdown lists. Removed
 * layout shutdown function (now subsumed by shutdown lists).
 *
 * Revision 1.9  1996/05/23  21:46:35  jimz
 * checkpoint in code cleanup (release prep)
 * lots of types, function names have been fixed
 *
 * Revision 1.8  1996/05/18  19:51:34  jimz
 * major code cleanup- fix syntax, make some types consistent,
 * add prototypes, clean out dead code, et cetera
 *
 * Revision 1.7  1996/05/17  16:30:41  jimz
 * convert to RF_FREELIST stuff
 *
 * Revision 1.6  1995/12/01  15:16:04  root
 * added copyright info
 *
 */

#ifndef _KERNEL
#ifdef __NetBSD__
#include <unistd.h>
#endif /* __NetBSD__ */
#endif

#include "rf_types.h"
#include "rf_threadstuff.h"
#include "rf_callback.h"
#include "rf_debugMem.h"
#include "rf_freelist.h"
#include "rf_shutdown.h"

static RF_FreeList_t *rf_callback_freelist;

#define RF_MAX_FREE_CALLBACK 64
#define RF_CALLBACK_INC       4
#define RF_CALLBACK_INITIAL   4

static void rf_ShutdownCallback(void *);
static void rf_ShutdownCallback(ignored)
  void  *ignored;
{
	RF_FREELIST_DESTROY(rf_callback_freelist,next,(RF_CallbackDesc_t *));
}

int rf_ConfigureCallback(listp)
  RF_ShutdownList_t  **listp;
{
	int rc;

	RF_FREELIST_CREATE(rf_callback_freelist, RF_MAX_FREE_CALLBACK,
		RF_CALLBACK_INC, sizeof(RF_CallbackDesc_t));
	if (rf_callback_freelist == NULL)
		return(ENOMEM);
	rc = rf_ShutdownCreate(listp, rf_ShutdownCallback, NULL);
	if (rc) {
		RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", __FILE__,
			__LINE__, rc);
		rf_ShutdownCallback(NULL);
		return(rc);
	}
	RF_FREELIST_PRIME(rf_callback_freelist, RF_CALLBACK_INITIAL,next,
		(RF_CallbackDesc_t *));
	return(0);
}

RF_CallbackDesc_t *rf_AllocCallbackDesc()
{
	RF_CallbackDesc_t *p;

	RF_FREELIST_GET(rf_callback_freelist,p,next,(RF_CallbackDesc_t *));
	return(p);
}

void rf_FreeCallbackDesc(p)
  RF_CallbackDesc_t *p;
{
	RF_FREELIST_FREE(rf_callback_freelist,p,next);
}