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rf_callback.c revision 1.4 
      1 /*	$NetBSD: rf_callback.c,v 1.4 2001/09/26 02:52:57 oster Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Carnegie-Mellon University.
      4  * All rights reserved.
      5  *
      6  * Author: Jim Zelenka
      7  *
      8  * Permission to use, copy, modify and distribute this software and
      9  * its documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     16  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie the
     26  * rights to redistribute these changes.
     27  */
     28 
     29 /*****************************************************************************************
     30  *
     31  * callback.c -- code to manipulate callback descriptor
     32  *
     33  ****************************************************************************************/
     34 
     35 
     36 #include "rf_types.h"
     37 #include "rf_archs.h"
     38 #include "rf_threadstuff.h"
     39 #include "rf_callback.h"
     40 #include "rf_debugMem.h"
     41 #include "rf_freelist.h"
     42 #include "rf_shutdown.h"
     43 
     44 static RF_FreeList_t *rf_callback_freelist;
     45 
     46 #define RF_MAX_FREE_CALLBACK 64
     47 #define RF_CALLBACK_INC       4
     48 #define RF_CALLBACK_INITIAL   4
     49 
     50 static void rf_ShutdownCallback(void *);
     51 static void
     52 rf_ShutdownCallback(ignored)
     53 	void   *ignored;
     54 {
     55 	RF_FREELIST_DESTROY(rf_callback_freelist, next, (RF_CallbackDesc_t *));
     56 }
     57 
     58 int
     59 rf_ConfigureCallback(listp)
     60 	RF_ShutdownList_t **listp;
     61 {
     62 	int     rc;
     63 
     64 	RF_FREELIST_CREATE(rf_callback_freelist, RF_MAX_FREE_CALLBACK,
     65 	    RF_CALLBACK_INC, sizeof(RF_CallbackDesc_t));
     66 	if (rf_callback_freelist == NULL)
     67 		return (ENOMEM);
     68 	rc = rf_ShutdownCreate(listp, rf_ShutdownCallback, NULL);
     69 	if (rc) {
     70 		RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", __FILE__,
     71 		    __LINE__, rc);
     72 		rf_ShutdownCallback(NULL);
     73 		return (rc);
     74 	}
     75 	RF_FREELIST_PRIME(rf_callback_freelist, RF_CALLBACK_INITIAL, next,
     76 	    (RF_CallbackDesc_t *));
     77 	return (0);
     78 }
     79 
     80 RF_CallbackDesc_t *
     81 rf_AllocCallbackDesc()
     82 {
     83 	RF_CallbackDesc_t *p;
     84 
     85 	RF_FREELIST_GET(rf_callback_freelist, p, next, (RF_CallbackDesc_t *));
     86 	return (p);
     87 }
     88 
     89 void
     90 rf_FreeCallbackDesc(p)
     91 	RF_CallbackDesc_t *p;
     92 {
     93 	RF_FREELIST_FREE(rf_callback_freelist, p, next);
     94 }
     95