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/* $OpenBSD: rf_alloclist.c,v 1.5 2011/06/21 16:46:00 tedu Exp $ */
/* $NetBSD: rf_alloclist.c,v 1.4 1999/08/13 03:41:53 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Mark Holland
*
* 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.
*/
/****************************************************************************
*
* Alloclist.c -- Code to manipulate allocation lists.
*
* An allocation list is just a list of AllocListElem structures. Each
* such structure contains a fixed-size array of pointers. Calling
* FreeAList() causes each pointer to be freed.
*
***************************************************************************/
#include "rf_types.h"
#include "rf_threadstuff.h"
#include "rf_alloclist.h"
#include "rf_debugMem.h"
#include "rf_etimer.h"
#include "rf_general.h"
#include "rf_shutdown.h"
RF_DECLARE_STATIC_MUTEX(alist_mutex);
static unsigned int fl_hit_count, fl_miss_count;
static RF_AllocListElem_t *al_free_list = NULL;
static int al_free_list_count;
#define RF_AL_FREELIST_MAX 256
#define DO_FREE(_p,_sz) RF_Free((_p), (_sz))
void rf_ShutdownAllocList(void *);
void
rf_ShutdownAllocList(void *ignored)
{
RF_AllocListElem_t *p, *pt;
for (p = al_free_list; p;) {
pt = p;
p = p->next;
DO_FREE(pt, sizeof(*pt));
}
rf_mutex_destroy(&alist_mutex);
/*
* printf("Alloclist: Free list hit count %lu (%lu %%) miss count %lu"
* " (%lu %%).\n", fl_hit_count,
* (100*fl_hit_count)/(fl_hit_count+fl_miss_count),
* fl_miss_count, (100*fl_miss_count)/(fl_hit_count+fl_miss_count));
*/
}
int
rf_ConfigureAllocList(RF_ShutdownList_t **listp)
{
int rc;
rc = rf_mutex_init(&alist_mutex);
if (rc) {
RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d.\n",
__FILE__, __LINE__, rc);
return (rc);
}
al_free_list = NULL;
fl_hit_count = fl_miss_count = al_free_list_count = 0;
rc = rf_ShutdownCreate(listp, rf_ShutdownAllocList, NULL);
if (rc) {
RF_ERRORMSG3("Unable to add to shutdown list file %s line %d"
" rc=%d.\n", __FILE__, __LINE__, rc);
rf_mutex_destroy(&alist_mutex);
return (rc);
}
return (0);
}
/*
* We expect the lists to have at most one or two elements, so we're willing
* to search for the end. If you ever observe the lists growing longer,
* increase POINTERS_PER_ALLOC_LIST_ELEMENT.
*/
void
rf_real_AddToAllocList(RF_AllocListElem_t *l, void *p, int size, int lockflag)
{
RF_AllocListElem_t *newelem;
for (; l->next; l = l->next)
RF_ASSERT(l->numPointers == RF_POINTERS_PER_ALLOC_LIST_ELEMENT); /* Find end of list. */
RF_ASSERT(l->numPointers >= 0 &&
l->numPointers <= RF_POINTERS_PER_ALLOC_LIST_ELEMENT);
if (l->numPointers == RF_POINTERS_PER_ALLOC_LIST_ELEMENT) {
newelem = rf_real_MakeAllocList(lockflag);
l->next = newelem;
l = newelem;
}
l->pointers[l->numPointers] = p;
l->sizes[l->numPointers] = size;
l->numPointers++;
}
/*
* We use the debug_mem_mutex here because we need to lock it anyway to call
* free. This is probably a bug somewhere else in the code, but when I call
* malloc/free outside of any lock, I have endless trouble with malloc
* appearing to return the same pointer twice. Since we have to lock it
* anyway, we might as well use it as the lock around the al_free_list.
* Note that we can't call Free with the debug_mem_mutex locked.
*/
void
rf_FreeAllocList(RF_AllocListElem_t *l)
{
int i;
RF_AllocListElem_t *temp, *p;
for (p = l; p; p = p->next) {
RF_ASSERT(p->numPointers >= 0 &&
p->numPointers <= RF_POINTERS_PER_ALLOC_LIST_ELEMENT);
for (i = 0; i < p->numPointers; i++) {
RF_ASSERT(p->pointers[i]);
RF_Free(p->pointers[i], p->sizes[i]);
}
}
while (l) {
temp = l;
l = l->next;
if (al_free_list_count > RF_AL_FREELIST_MAX) {
DO_FREE(temp, sizeof(*temp));
} else {
temp->next = al_free_list;
al_free_list = temp;
al_free_list_count++;
}
}
}
RF_AllocListElem_t *
rf_real_MakeAllocList(int lockflag)
{
RF_AllocListElem_t *p;
if (al_free_list) {
fl_hit_count++;
p = al_free_list;
al_free_list = p->next;
al_free_list_count--;
} else {
fl_miss_count++;
RF_Malloc(p, sizeof(RF_AllocListElem_t),
(RF_AllocListElem_t *)); /*
* No allocation locking
* in kernel, so this is
* fine.
*/
}
if (p == NULL) {
return (NULL);
}
bzero(p, sizeof(RF_AllocListElem_t));
return (p);
}
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