git.sur5r.net Git - openldap/blob - servers/slapd/zn_malloc.c

   1 /* zn_malloc.c - zone-based malloc routines */
   2 /* $OpenLDAP$*/
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2003-2004 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* Copyright 2004 IBM Corporation
  17  * All rights reserved.
  18  * Redisribution and use in source and binary forms, with or without
  19  * modification, are permitted only as  authorizd by the OpenLADP
  20  * Public License.
  21  */
  22 /* ACKNOWLEDGEMENTS
  23  * This work originally developed by Jong-Hyuk Choi
  24  * 2004/11/29   jongchoi@OpenLDAP.org
  25  */
  26
  27 #include "portable.h"
  28
  29 #include <stdio.h>
  30 #include <ac/string.h>
  31 #include <sys/types.h>
  32 #include <sys/mman.h>
  33 #include <fcntl.h>
  34
  35 #include "slap.h"
  36
  37 #ifdef SLAP_ZONE_ALLOC
  38
  39 static int slap_zone_cmp(const void *v1, const void *v2);
  40 void * slap_replenish_zopool(void *ctx);
  41
  42 static void
  43 slap_zo_release(void *data)
  44 {
  45         struct zone_object *zo = (struct zone_object *)data;
  46         ch_free( zo );
  47 }
  48
  49 void
  50 slap_zn_mem_destroy(
  51         void *ctx
  52 )
  53 {
  54         struct zone_heap *zh = ctx;
  55         int pad = 2*sizeof(int)-1, pad_shift;
  56         int order_start = -1, i, j;
  57         struct zone_object *zo;
  58
  59         pad_shift = pad - 1;
  60         do {
  61                 order_start++;
  62         } while (pad_shift >>= 1);
  63
  64         ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
  65         for (i = 0; i <= zh->zh_zoneorder - order_start; i++) {
  66                 zo = LDAP_LIST_FIRST(&zh->zh_free[i]);
  67                 while (zo) {
  68                         struct zone_object *zo_tmp = zo;
  69                         zo = LDAP_LIST_NEXT(zo, zo_link);
  70                         LDAP_LIST_INSERT_HEAD(&zh->zh_zopool, zo_tmp, zo_link);
  71                 }
  72         }
  73         ch_free(zh->zh_free);
  74
  75         for (i = 0; i < zh->zh_numzones; i++) {
  76                 for (j = 0; j < zh->zh_zoneorder - order_start; j++) {
  77                         ch_free(zh->zh_maps[i][j]);
  78                 }
  79                 ch_free(zh->zh_maps[i]);
  80                 munmap(zh->zh_zones[i], zh->zh_zonesize);
  81         }
  82         ch_free(zh->zh_maps);
  83         ch_free(zh->zh_zones);
  84         ch_free(zh->zh_seqno);
  85
  86         avl_free(zh->zh_zonetree, slap_zo_release);
  87
  88         zo = LDAP_LIST_FIRST(&zh->zh_zopool);
  89         while (zo) {
  90                 struct zone_object *zo_tmp = zo;
  91                 zo = LDAP_LIST_NEXT(zo, zo_link);
  92                 if (!zo_tmp->zo_blockhead) {
  93                         LDAP_LIST_REMOVE(zo_tmp, zo_link);
  94                 }
  95         }
  96         zo = LDAP_LIST_FIRST(&zh->zh_zopool);
  97         while (zo) {
  98                 struct zone_object *zo_tmp = zo;
  99                 zo = LDAP_LIST_NEXT(zo, zo_link);
 100                 ch_free(zo_tmp);
 101         }
 102         ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
 103         ldap_pvt_thread_mutex_destroy( &zh->zh_mutex );
 104         ch_free(zh);
 105 }
 106
 107 void *
 108 slap_zn_mem_create(
 109         ber_len_t initsize,
 110         ber_len_t maxsize,
 111         ber_len_t deltasize,
 112         ber_len_t zonesize
 113 )
 114 {
 115         struct zone_heap *zh = NULL;
 116         ber_len_t zpad;
 117         int pad = 2*sizeof(int)-1, pad_shift;
 118         int size_shift;
 119         int order = -1, order_start = -1, order_end = -1;
 120         int i, j;
 121         struct zone_object *zo;
 122
 123         zh = (struct zone_heap *)ch_calloc(1, sizeof(struct zone_heap));
 124
 125         zh->zh_fd = open("/dev/zero", O_RDWR);
 126
 127         if ( zonesize ) {
 128                 zh->zh_zonesize = zonesize;
 129         } else {
 130                 zh->zh_zonesize = SLAP_ZONE_SIZE;
 131         }
 132
 133         zpad = zh->zh_zonesize - 1;
 134         zh->zh_numzones = ((initsize + zpad) & ~zpad) / zh->zh_zonesize;
 135
 136         if ( maxsize && maxsize >= initsize ) {
 137                 zh->zh_maxzones = ((maxsize + zpad) & ~zpad) / zh->zh_zonesize;
 138         } else {
 139                 zh->zh_maxzones = ((initsize + zpad) & ~zpad) / zh->zh_zonesize;
 140         }
 141
 142         if ( deltasize ) {
 143                 zh->zh_deltazones = ((deltasize + zpad) & ~zpad) / zh->zh_zonesize;
 144         } else {
 145                 zh->zh_deltazones = ((SLAP_ZONE_DELTA+zpad) & ~zpad) / zh->zh_zonesize;
 146         }
 147
 148         Debug(LDAP_DEBUG_ANY, "==> slap_zn_mem_create: %d\n",
 149                                         zh->zh_numzones, 0, 0 );
 150
 151         size_shift = zh->zh_zonesize - 1;
 152         do {
 153                 order_end++;
 154         } while (size_shift >>= 1);
 155
 156         pad_shift = pad - 1;
 157         do {
 158                 order_start++;
 159         } while (pad_shift >>= 1);
 160
 161         order = order_end - order_start + 1;
 162
 163         zh->zh_zones = (void **)ch_malloc(zh->zh_maxzones * sizeof(void*));
 164         zh->zh_maps = (unsigned char ***)ch_malloc(
 165                                         zh->zh_maxzones * sizeof(unsigned char**));
 166
 167         zh->zh_zoneorder = order_end;
 168         zh->zh_free = (struct zh_freelist *)
 169                                         ch_malloc(order * sizeof(struct zh_freelist));
 170         zh->zh_seqno = (unsigned long *)ch_calloc(zh->zh_maxzones,
 171                                                                                         sizeof(unsigned long));
 172         for (i = 0; i < order; i++) {
 173                 LDAP_LIST_INIT(&zh->zh_free[i]);
 174         }
 175         LDAP_LIST_INIT(&zh->zh_zopool);
 176
 177         for (i = 0; i < zh->zh_numzones; i++) {
 178                 zh->zh_zones[i] = mmap(0, zh->zh_zonesize, PROT_READ | PROT_WRITE,
 179                                                         MAP_PRIVATE, zh->zh_fd, 0);
 180                 zh->zh_maps[i] = (unsigned char **)
 181                                         ch_malloc(order * sizeof(unsigned char *));
 182                 for (j = 0; j < order; j++) {
 183                         int shiftamt = order_start + 1 + j;
 184                         int nummaps = zh->zh_zonesize >> shiftamt;
 185                         assert(nummaps);
 186                         nummaps /= 8;
 187                         if (!nummaps) nummaps = 1;
 188                         zh->zh_maps[i][j] = (unsigned char *)ch_malloc(nummaps);
 189                         memset(zh->zh_maps[i][j], 0, nummaps);
 190                 }
 191
 192                 if (LDAP_LIST_EMPTY(&zh->zh_zopool)) {
 193                         slap_replenish_zopool(zh);
 194                 }
 195                 zo = LDAP_LIST_FIRST(&zh->zh_zopool);
 196                 LDAP_LIST_REMOVE(zo, zo_link);
 197                 zo->zo_ptr = zh->zh_zones[i];
 198                 zo->zo_idx = i;
 199                 LDAP_LIST_INSERT_HEAD(&zh->zh_free[order-1], zo, zo_link);
 200
 201                 if (LDAP_LIST_EMPTY(&zh->zh_zopool)) {
 202                         slap_replenish_zopool(zh);
 203                 }
 204                 zo = LDAP_LIST_FIRST(&zh->zh_zopool);
 205                 LDAP_LIST_REMOVE(zo, zo_link);
 206                 zo->zo_ptr = (void*)((unsigned long)zh->zh_zones[i]>>zh->zh_zoneorder);
 207                 zo->zo_idx = i;
 208                 avl_insert(&zh->zh_zonetree, zo, slap_zone_cmp, avl_dup_error);
 209         }
 210
 211         ldap_pvt_thread_mutex_init(&zh->zh_mutex);
 212
 213         return zh;
 214 }
 215
 216 void *
 217 slap_zn_malloc(
 218     ber_len_t   size,
 219         void *ctx
 220 )
 221 {
 222         struct zone_heap *zh = ctx;
 223         ber_len_t size_shift;
 224         int pad = 2*sizeof(int)-1, pad_shift;
 225         int order = -1, order_start = -1;
 226         struct zone_object *zo, *zo_new, *zo_left, *zo_right;
 227         ber_len_t *ptr, *new;
 228         int idx;
 229         unsigned long diff;
 230         int i, j, k;
 231
 232         if (!zh) return ber_memalloc_x(size, NULL);
 233
 234         /* round up to doubleword boundary */
 235         size += 2*sizeof(ber_len_t) + pad;
 236         size &= ~pad;
 237
 238         size_shift = size - 1;
 239         do {
 240                 order++;
 241         } while (size_shift >>= 1);
 242
 243         pad_shift = pad - 1;
 244         do {
 245                 order_start++;
 246         } while (pad_shift >>= 1);
 247
 248 retry:
 249
 250         ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
 251         for (i = order; i <= zh->zh_zoneorder &&
 252                         LDAP_LIST_EMPTY(&zh->zh_free[i-order_start]); i++);
 253
 254         if (i == order) {
 255                 zo_new = LDAP_LIST_FIRST(&zh->zh_free[i-order_start]);
 256                 LDAP_LIST_REMOVE(zo_new, zo_link);
 257                 ptr = zo_new->zo_ptr;
 258                 idx = zo_new->zo_idx;
 259                 diff = (unsigned long)((char*)ptr -
 260                                 (char*)zh->zh_zones[idx]) >> (order + 1);
 261                 zh->zh_maps[idx][order-order_start][diff>>3] |= (1 << (diff & 0x7));
 262                 *ptr++ = zh->zh_seqno[idx];
 263                 *ptr++ = size - 2*sizeof(ber_len_t);
 264                 zo_new->zo_ptr = NULL;
 265                 zo_new->zo_idx = -1;
 266                 LDAP_LIST_INSERT_HEAD(&zh->zh_zopool, zo_new, zo_link);
 267                 ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
 268                 return((void*)ptr);
 269         } else if (i <= zh->zh_zoneorder) {
 270                 for (j = i; j > order; j--) {
 271                         zo_left = LDAP_LIST_FIRST(&zh->zh_free[j-order_start]);
 272                         LDAP_LIST_REMOVE(zo_left, zo_link);
 273                         if (LDAP_LIST_EMPTY(&zh->zh_zopool)) {
 274                                 slap_replenish_zopool(zh);
 275                         }
 276                         zo_right = LDAP_LIST_FIRST(&zh->zh_zopool);
 277                         LDAP_LIST_REMOVE(zo_right, zo_link);
 278                         zo_right->zo_ptr = zo_left->zo_ptr + (1 << j);
 279                         zo_right->zo_idx = zo_left->zo_idx;
 280                         if (j == order + 1) {
 281                                 ptr = zo_left->zo_ptr;
 282                                 diff = (unsigned long)((char*)ptr -
 283                                                 (char*)zh->zh_zones[zo_left->zo_idx]) >> (order+1);
 284                                 zh->zh_maps[zo_left->zo_idx][order-order_start][diff>>3] |=
 285                                                 (1 << (diff & 0x7));
 286                                 *ptr++ = zh->zh_seqno[zo_left->zo_idx];
 287                                 *ptr++ = size - 2*sizeof(ber_len_t);
 288                                 LDAP_LIST_INSERT_HEAD(
 289                                                 &zh->zh_free[j-1-order_start], zo_right, zo_link);
 290                                 LDAP_LIST_INSERT_HEAD(&zh->zh_zopool, zo_left, zo_link);
 291                                 ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
 292                                 return((void*)ptr);
 293                         } else {
 294                                 LDAP_LIST_INSERT_HEAD(
 295                                                 &zh->zh_free[j-1-order_start], zo_right, zo_link);
 296                                 LDAP_LIST_INSERT_HEAD(
 297                                                 &zh->zh_free[j-1-order_start], zo_left, zo_link);
 298                         }
 299                 }
 300                 assert(0);
 301         } else {
 302
 303                 if ( zh->zh_maxzones < zh->zh_numzones + zh->zh_deltazones ) {
 304                         ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
 305                         Debug( LDAP_DEBUG_TRACE,
 306                                 "slap_zn_malloc of %lu bytes failed, using ch_malloc\n",
 307                                 (long)size, 0, 0);
 308                         return (void*)ch_malloc(size);
 309                 }
 310
 311                 for (i = zh->zh_numzones; i < zh->zh_numzones+zh->zh_deltazones; i++) {
 312                         zh->zh_zones[i] = mmap(0, zh->zh_zonesize, PROT_READ | PROT_WRITE,
 313                                                                 MAP_PRIVATE, zh->zh_fd, 0);
 314                         zh->zh_maps[i] = (unsigned char **)
 315                                                 ch_malloc((zh->zh_zoneorder - order_start +1) *
 316                                                 sizeof(unsigned char *));
 317                         for (j = 0; j < order; j++) {
 318                                 int shiftamt = order_start + 1 + j;
 319                                 int nummaps = zh->zh_zonesize >> shiftamt;
 320                                 assert(nummaps);
 321                                 nummaps /= 8;
 322                                 if (!nummaps) nummaps = 1;
 323                                 zh->zh_maps[i][j] = (unsigned char *)ch_malloc(nummaps);
 324                                 memset(zh->zh_maps[i][j], 0, nummaps);
 325                         }
 326
 327                         if (LDAP_LIST_EMPTY(&zh->zh_zopool)) {
 328                                 slap_replenish_zopool(zh);
 329                         }
 330                         zo = LDAP_LIST_FIRST(&zh->zh_zopool);
 331                         LDAP_LIST_REMOVE(zo, zo_link);
 332                         zo->zo_ptr = zh->zh_zones[i];
 333                         zo->zo_idx = i;
 334                         LDAP_LIST_INSERT_HEAD(&zh->
 335                                                 zh_free[zh->zh_zoneorder-order_start],zo,zo_link);
 336
 337                         if (LDAP_LIST_EMPTY(&zh->zh_zopool)) {
 338                                 slap_replenish_zopool(zh);
 339                         }
 340                         zo = LDAP_LIST_FIRST(&zh->zh_zopool);
 341                         LDAP_LIST_REMOVE(zo, zo_link);
 342                         zo->zo_ptr = (void*)((unsigned long)zh->zh_zones[i]>>
 343                                                 zh->zh_zoneorder);
 344                         zo->zo_idx = i;
 345                         avl_insert(&zh->zh_zonetree, zo, slap_zone_cmp, avl_dup_error);
 346                 }
 347                 zh->zh_numzones += zh->zh_deltazones;
 348                 ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
 349                 goto retry;
 350         }
 351 }
 352
 353 void *
 354 slap_zn_calloc( ber_len_t n, ber_len_t size, void *ctx )
 355 {
 356         void *new;
 357
 358         new = slap_zn_malloc( n*size, ctx );
 359         if ( new ) {
 360                 memset( new, 0, n*size );
 361         }
 362         return new;
 363 }
 364
 365 void *
 366 slap_zn_realloc(void *ptr, ber_len_t size, void *ctx)
 367 {
 368         struct zone_heap *zh = ctx;
 369         int pad = 2*sizeof(int)-1, pad_shift;
 370         int order_start = -1, order = -1;
 371         struct zone_object zoi, *zoo;
 372         ber_len_t *p = (ber_len_t *)ptr, *new;
 373         unsigned long diff;
 374         int i;
 375         void *newptr = NULL;
 376         struct zone_heap *zone = NULL;
 377
 378         if (ptr == NULL)
 379                 return slap_zn_malloc(size, zh);
 380
 381         zoi.zo_ptr = (void*)((unsigned long)p >> zh->zh_zoneorder);
 382         zoi.zo_idx = -1;
 383
 384         if (zh) {
 385                 ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
 386                 zoo = avl_find(zh->zh_zonetree, &zoi, slap_zone_cmp);
 387                 ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
 388         }
 389
 390         /* Not our memory? */
 391         if (!zoo) {
 392                 /* duplicate of realloc behavior, oh well */
 393                 new = ber_memrealloc_x(ptr, size, NULL);
 394                 if (new) {
 395                         return new;
 396                 }
 397                 Debug(LDAP_DEBUG_ANY, "ch_realloc of %lu bytes failed\n",
 398                                 (long) size, 0, 0);
 399                 assert(0);
 400                 exit( EXIT_FAILURE );
 401         }
 402
 403         assert(zoo->zo_idx != -1);
 404
 405         zone = zh->zh_zones[zoo->zo_idx];
 406
 407         if (size == 0) {
 408                 slap_zn_free(ptr, zh);
 409                 return NULL;
 410         }
 411
 412         newptr = slap_zn_malloc(size, zh);
 413         if (size < p[-1]) {
 414                 AC_MEMCPY(newptr, ptr, size);
 415         } else {
 416                 AC_MEMCPY(newptr, ptr, p[-1]);
 417         }
 418         slap_zn_free(ptr, zh);
 419         return newptr;
 420 }
 421
 422 void
 423 slap_zn_free(void *ptr, void *ctx)
 424 {
 425         struct zone_heap *zh = ctx;
 426         int size, size_shift, order_size;
 427         int pad = 2*sizeof(int)-1, pad_shift;
 428         ber_len_t *p = (ber_len_t *)ptr, *tmpp;
 429         int order_start = -1, order = -1;
 430         struct zone_object zoi, *zoo, *zo;
 431         unsigned long diff;
 432         int i, k, inserted = 0, idx;
 433         struct zone_heap *zone = NULL;
 434
 435         fprintf(stderr,"slap_zn_free... 0x%x\n", ptr);
 436         zoi.zo_ptr = (void*)((unsigned long)p >> zh->zh_zoneorder);
 437         zoi.zo_idx = -1;
 438
 439         if (zh) {
 440                 ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
 441                 zoo = avl_find(zh->zh_zonetree, &zoi, slap_zone_cmp);
 442                 ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
 443         }
 444
 445         if (!zoo) {
 446                 ber_memfree_x(ptr, NULL);
 447         } else {
 448                 idx = zoo->zo_idx;
 449                 assert(idx != -1);
 450                 zone = zh->zh_zones[idx];
 451
 452                 size = *(--p);
 453                 size_shift = size + 2*sizeof(ber_len_t) - 1;
 454                 do {
 455                         order++;
 456                 } while (size_shift >>= 1);
 457
 458                 pad_shift = pad - 1;
 459                 do {
 460                         order_start++;
 461                 } while (pad_shift >>= 1);
 462
 463                 ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
 464                 for (i = order, tmpp = p; i <= zh->zh_zoneorder; i++) {
 465                         order_size = 1 << (i+1);
 466                         diff = (unsigned long)((char*)tmpp - (char*)zone) >> (i+1);
 467                         zh->zh_maps[idx][i-order_start][diff>>3] &= (~(1 << (diff & 0x7)));
 468                         if (diff == ((diff>>1)<<1)) {
 469                                 if (!(zh->zh_maps[idx][i-order_start][(diff+1)>>3] &
 470                                                 (1<<((diff+1)&0x7)))) {
 471                                         zo = LDAP_LIST_FIRST(&zh->zh_free[i-order_start]);
 472                                         while (zo) {
 473                                                 if ((char*)zo->zo_ptr == (char*)tmpp) {
 474                                                         LDAP_LIST_REMOVE( zo, zo_link );
 475                                                 } else if ((char*)zo->zo_ptr ==
 476                                                                 (char*)tmpp + order_size) {
 477                                                         LDAP_LIST_REMOVE(zo, zo_link);
 478                                                         break;
 479                                                 }
 480                                                 zo = LDAP_LIST_NEXT(zo, zo_link);
 481                                         }
 482                                         if (zo) {
 483                                                 if (i < zh->zh_zoneorder) {
 484                                                         inserted = 1;
 485                                                         zo->zo_ptr = tmpp;
 486                                                         LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start+1],
 487                                                                         zo, zo_link);
 488                                                 }
 489                                                 continue;
 490                                         } else {
 491                                                 if (LDAP_LIST_EMPTY(&zh->zh_zopool)) {
 492                                                         slap_replenish_zopool(zh);
 493                                                 }
 494                                                 zo = LDAP_LIST_FIRST(&zh->zh_zopool);
 495                                                 LDAP_LIST_REMOVE(zo, zo_link);
 496                                                 zo->zo_ptr = tmpp;
 497                                                 LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start],
 498                                                                 zo, zo_link);
 499                                                 break;
 500
 501                                                 Debug(LDAP_DEBUG_ANY, "slap_zn_free: "
 502                                                         "free object not found while bit is clear.\n",
 503                                                         0, 0, 0);
 504                                                 assert(zo);
 505
 506                                         }
 507                                 } else {
 508                                         if (!inserted) {
 509                                                 if (LDAP_LIST_EMPTY(&zh->zh_zopool)) {
 510                                                         slap_replenish_zopool(zh);
 511                                                 }
 512                                                 zo = LDAP_LIST_FIRST(&zh->zh_zopool);
 513                                                 LDAP_LIST_REMOVE(zo, zo_link);
 514                                                 zo->zo_ptr = tmpp;
 515                                                 LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start],
 516                                                                 zo, zo_link);
 517                                         }
 518                                         break;
 519                                 }
 520                         } else {
 521                                 if (!(zh->zh_maps[idx][i-order_start][(diff-1)>>3] &
 522                                                 (1<<((diff-1)&0x7)))) {
 523                                         zo = LDAP_LIST_FIRST(&zh->zh_free[i-order_start]);
 524                                         while (zo) {
 525                                                 if ((char*)zo->zo_ptr == (char*)tmpp) {
 526                                                         LDAP_LIST_REMOVE(zo, zo_link);
 527                                                 } else if ((char*)tmpp == zo->zo_ptr + order_size) {
 528                                                         LDAP_LIST_REMOVE(zo, zo_link);
 529                                                         tmpp = zo->zo_ptr;
 530                                                         break;
 531                                                 }
 532                                                 zo = LDAP_LIST_NEXT(zo, zo_link);
 533                                         }
 534                                         if (zo) {
 535                                                 if (i < zh->zh_zoneorder) {
 536                                                         inserted = 1;
 537                                                         LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start+1],
 538                                                                         zo, zo_link);
 539                                                         continue;
 540                                                 }
 541                                         } else {
 542                                                 if (LDAP_LIST_EMPTY(&zh->zh_zopool)) {
 543                                                         slap_replenish_zopool(zh);
 544                                                 }
 545                                                 zo = LDAP_LIST_FIRST(&zh->zh_zopool);
 546                                                 LDAP_LIST_REMOVE(zo, zo_link);
 547                                                 zo->zo_ptr = tmpp;
 548                                                 LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start],
 549                                                                 zo, zo_link);
 550                                                 break;
 551
 552                                                 Debug(LDAP_DEBUG_ANY, "slap_zn_free: "
 553                                                         "free object not found while bit is clear.\n",
 554                                                         0, 0, 0 );
 555                                                 assert( zo );
 556
 557                                         }
 558                                 } else {
 559                                         if ( !inserted ) {
 560                                                 if (LDAP_LIST_EMPTY(&zh->zh_zopool)) {
 561                                                         slap_replenish_zopool(zh);
 562                                                 }
 563                                                 zo = LDAP_LIST_FIRST(&zh->zh_zopool);
 564                                                 LDAP_LIST_REMOVE(zo, zo_link);
 565                                                 zo->zo_ptr = tmpp;
 566                                                 LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start],
 567                                                                 zo, zo_link);
 568                                         }
 569                                         break;
 570                                 }
 571                         }
 572                 }
 573                 ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
 574         }
 575 }
 576
 577 static int
 578 slap_zone_cmp(const void *v1, const void *v2)
 579 {
 580         const struct zone_object *zo1 = v1;
 581         const struct zone_object *zo2 = v2;
 582
 583         return zo1->zo_ptr - zo2->zo_ptr;
 584 }
 585
 586 void *
 587 slap_replenish_zopool(
 588         void *ctx
 589 )
 590 {
 591         struct zone_heap* zh = ctx;
 592         struct zone_object *zo_block;
 593         int i;
 594
 595         zo_block = (struct zone_object *)ch_malloc(
 596                                         SLAP_ZONE_ZOBLOCK * sizeof(struct zone_object));
 597
 598         if ( zo_block == NULL ) {
 599                 return NULL;
 600         }
 601
 602         zo_block[0].zo_blockhead = 1;
 603         LDAP_LIST_INSERT_HEAD(&zh->zh_zopool, &zo_block[0], zo_link);
 604         for (i = 1; i < SLAP_ZONE_ZOBLOCK; i++) {
 605                 zo_block[i].zo_blockhead = 0;
 606                 LDAP_LIST_INSERT_HEAD(&zh->zh_zopool, &zo_block[i], zo_link );
 607         }
 608
 609         return zo_block;
 610 }
 611 #endif /* SLAP_ZONE_ALLOC */