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

   1 /* sl_malloc.c - malloc routines using a per-thread slab */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2003-2011 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
  17 #include "portable.h"
  18
  19 #include <stdio.h>
  20 #include <ac/string.h>
  21
  22 #include "slap.h"
  23
  24 enum {
  25         Align = 2 * sizeof(int),
  26         Align_log2 = 1 + (Align>2) + (Align>4) + (Align>8) + (Align>16),
  27         order_start = Align_log2 - 1,
  28         pad = Align - 1
  29 };
  30
  31 static struct slab_object * slap_replenish_sopool(struct slab_heap* sh);
  32 #ifdef SLAPD_UNUSED
  33 static void print_slheap(int level, void *ctx);
  34 #endif
  35
  36 /* Keep memory context in a thread-local var, or in a global when no threads */
  37 #ifdef NO_THREADS
  38 static struct slab_heap *slheap;
  39 # define SET_MEMCTX(thrctx, memctx, sfree)      ((void) (slheap = (memctx)))
  40 # define GET_MEMCTX(thrctx, memctxp)            (*(memctxp) = slheap))
  41 #else
  42 # define memctx_key ((void *) slap_sl_mem_init)
  43 # define SET_MEMCTX(thrctx, memctx, kfree) \
  44         ldap_pvt_thread_pool_setkey(thrctx,memctx_key, memctx,kfree, NULL,NULL)
  45 # define GET_MEMCTX(thrctx, memctxp) \
  46         ((void) (*(memctxp) = NULL), \
  47          (void) ldap_pvt_thread_pool_getkey(thrctx,memctx_key, memctxp,NULL), \
  48          *(memctxp))
  49 #endif /* NO_THREADS */
  50
  51
  52 /* Destroy the context, or if key==NULL clean it up for reuse. */
  53 void
  54 slap_sl_mem_destroy(
  55         void *key,
  56         void *data
  57 )
  58 {
  59         struct slab_heap *sh = data;
  60         struct slab_object *so;
  61         int i;
  62
  63         if (!sh->sh_stack) {
  64                 for (i = 0; i <= sh->sh_maxorder - order_start; i++) {
  65                         so = LDAP_LIST_FIRST(&sh->sh_free[i]);
  66                         while (so) {
  67                                 struct slab_object *so_tmp = so;
  68                                 so = LDAP_LIST_NEXT(so, so_link);
  69                                 LDAP_LIST_INSERT_HEAD(&sh->sh_sopool, so_tmp, so_link);
  70                         }
  71                         ch_free(sh->sh_map[i]);
  72                 }
  73                 ch_free(sh->sh_free);
  74                 ch_free(sh->sh_map);
  75
  76                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
  77                 while (so) {
  78                         struct slab_object *so_tmp = so;
  79                         so = LDAP_LIST_NEXT(so, so_link);
  80                         if (!so_tmp->so_blockhead) {
  81                                 LDAP_LIST_REMOVE(so_tmp, so_link);
  82                         }
  83                 }
  84                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
  85                 while (so) {
  86                         struct slab_object *so_tmp = so;
  87                         so = LDAP_LIST_NEXT(so, so_link);
  88                         ch_free(so_tmp);
  89                 }
  90         }
  91
  92         if (key != NULL) {
  93                 ber_memfree_x(sh->sh_base, NULL);
  94                 ber_memfree_x(sh, NULL);
  95         }
  96 }
  97
  98 BerMemoryFunctions slap_sl_mfuncs =
  99         { slap_sl_malloc, slap_sl_calloc, slap_sl_realloc, slap_sl_free };
 100
 101 void
 102 slap_sl_mem_init()
 103 {
 104         assert( Align == 1 << Align_log2 );
 105         /* Adding head+tail preserves alignment */
 106         assert( 2*sizeof(ber_len_t) % Align == 0 );
 107
 108         ber_set_option( NULL, LBER_OPT_MEMORY_FNS, &slap_sl_mfuncs );
 109 }
 110
 111 /* This allocator always returns memory aligned on a 2-int boundary.
 112  *
 113  * The stack-based allocator stores the size as a ber_len_t at both
 114  * the head and tail of the allocated block. When freeing a block, the
 115  * tail length is ORed with 1 to mark it as free. Freed space can only
 116  * be reclaimed from the tail forward. If the tail block is never freed,
 117  * nothing else will be reclaimed until the slab is reset...
 118  */
 119 void *
 120 slap_sl_mem_create(
 121         ber_len_t size,
 122         int stack,
 123         void *thrctx,
 124         int new
 125 )
 126 {
 127         void *memctx;
 128         struct slab_heap *sh;
 129         ber_len_t size_shift;
 130         struct slab_object *so;
 131
 132         sh = GET_MEMCTX(thrctx, &memctx);
 133         if ( sh && !new )
 134                 return sh;
 135
 136         /* round up to doubleword boundary */
 137         size = (size + Align-1) & -Align;
 138
 139         if (!sh) {
 140                 sh = ch_malloc(sizeof(struct slab_heap));
 141                 sh->sh_base = ch_malloc(size);
 142                 SET_MEMCTX(thrctx, sh, slap_sl_mem_destroy);
 143         } else {
 144                 slap_sl_mem_destroy(NULL, sh);
 145                 if ( size > (char *)sh->sh_end - (char *)sh->sh_base ) {
 146                         void    *newptr;
 147
 148                         newptr = ch_realloc( sh->sh_base, size );
 149                         if ( newptr == NULL ) return NULL;
 150                         sh->sh_base = newptr;
 151                 }
 152         }
 153         sh->sh_end = (char *) sh->sh_base + size;
 154
 155         sh->sh_stack = stack;
 156         if (stack) {
 157                 /* insert dummy len */
 158                 {
 159                         ber_len_t *i = sh->sh_base;
 160                         *i++ = 0;
 161                         sh->sh_last = i;
 162                 }
 163         } else {
 164                 int i, order = -1, order_end = -1;
 165
 166                 size_shift = size - 1;
 167                 do {
 168                         order_end++;
 169                 } while (size_shift >>= 1);
 170                 order = order_end - order_start + 1;
 171                 sh->sh_maxorder = order_end;
 172
 173                 sh->sh_free = (struct sh_freelist *)
 174                                                 ch_malloc(order * sizeof(struct sh_freelist));
 175                 for (i = 0; i < order; i++) {
 176                         LDAP_LIST_INIT(&sh->sh_free[i]);
 177                 }
 178
 179                 LDAP_LIST_INIT(&sh->sh_sopool);
 180
 181                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 182                         slap_replenish_sopool(sh);
 183                 }
 184                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
 185                 LDAP_LIST_REMOVE(so, so_link);
 186                 so->so_ptr = sh->sh_base;
 187
 188                 LDAP_LIST_INSERT_HEAD(&sh->sh_free[order-1], so, so_link);
 189
 190                 sh->sh_map = (unsigned char **)
 191                                         ch_malloc(order * sizeof(unsigned char *));
 192                 for (i = 0; i < order; i++) {
 193                         int shiftamt = order_start + 1 + i;
 194                         int nummaps = size >> shiftamt;
 195                         assert(nummaps);
 196                         nummaps >>= 3;
 197                         if (!nummaps) nummaps = 1;
 198                         sh->sh_map[i] = (unsigned char *) ch_malloc(nummaps);
 199                         memset(sh->sh_map[i], 0, nummaps);
 200                 }
 201         }
 202         return sh;
 203 }
 204
 205 void
 206 slap_sl_mem_detach(
 207         void *thrctx,
 208         void *memctx
 209 )
 210 {
 211         /* separate from context */
 212         SET_MEMCTX(thrctx, NULL, 0);
 213 }
 214
 215 void *
 216 slap_sl_malloc(
 217     ber_len_t   size,
 218     void *ctx
 219 )
 220 {
 221         struct slab_heap *sh = ctx;
 222         ber_len_t *ptr, *newptr;
 223
 224 #ifdef SLAP_NO_SL_MALLOC
 225         newptr = ber_memalloc_x( size, NULL );
 226         if ( newptr ) return newptr;
 227         assert( 0 );
 228         exit( EXIT_FAILURE );
 229 #endif
 230
 231         /* ber_set_option calls us like this */
 232         if (!ctx) {
 233                 newptr = ber_memalloc_x( size, NULL );
 234                 if ( newptr ) return newptr;
 235                 Debug(LDAP_DEBUG_ANY, "slap_sl_malloc of %lu bytes failed\n",
 236                         (unsigned long) size, 0, 0);
 237                 assert( 0 );
 238                 exit( EXIT_FAILURE );
 239         }
 240
 241         /* round up to doubleword boundary, plus space for len at head and tail */
 242         size = (size + 2*sizeof(ber_len_t) + Align-1) & -Align;
 243
 244         if (sh->sh_stack) {
 245                 if ((char *)sh->sh_last + size >= (char *)sh->sh_end) {
 246                         size -= 2*sizeof(ber_len_t);
 247                         Debug(LDAP_DEBUG_TRACE,
 248                                 "slap_sl_malloc of %lu bytes failed, using ch_malloc\n",
 249                                 (unsigned long) size, 0, 0);
 250                         return ch_malloc(size);
 251                 }
 252                 newptr = sh->sh_last;
 253                 sh->sh_last = (char *) sh->sh_last + size;
 254                 size -= sizeof(ber_len_t);
 255                 *newptr++ = size;
 256                 *(ber_len_t *)((char *)sh->sh_last - sizeof(ber_len_t)) = size;
 257                 return( (void *)newptr );
 258         } else {
 259                 struct slab_object *so_new, *so_left, *so_right;
 260                 ber_len_t size_shift;
 261                 unsigned long diff;
 262                 int i, j, order = -1;
 263
 264                 size_shift = size - 1;
 265                 do {
 266                         order++;
 267                 } while (size_shift >>= 1);
 268
 269                 size -= sizeof(ber_len_t);
 270
 271                 for (i = order; i <= sh->sh_maxorder &&
 272                                 LDAP_LIST_EMPTY(&sh->sh_free[i-order_start]); i++);
 273
 274                 if (i == order) {
 275                         so_new = LDAP_LIST_FIRST(&sh->sh_free[i-order_start]);
 276                         LDAP_LIST_REMOVE(so_new, so_link);
 277                         ptr = so_new->so_ptr;
 278                         diff = (unsigned long)((char*)ptr -
 279                                         (char*)sh->sh_base) >> (order + 1);
 280                         sh->sh_map[order-order_start][diff>>3] |= (1 << (diff & 0x7));
 281                         *ptr++ = size;
 282                         LDAP_LIST_INSERT_HEAD(&sh->sh_sopool, so_new, so_link);
 283                         return((void*)ptr);
 284                 } else if (i <= sh->sh_maxorder) {
 285                         for (j = i; j > order; j--) {
 286                                 so_left = LDAP_LIST_FIRST(&sh->sh_free[j-order_start]);
 287                                 LDAP_LIST_REMOVE(so_left, so_link);
 288                                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 289                                         slap_replenish_sopool(sh);
 290                                 }
 291                                 so_right = LDAP_LIST_FIRST(&sh->sh_sopool);
 292                                 LDAP_LIST_REMOVE(so_right, so_link);
 293                                 so_right->so_ptr = (void *)((char *)so_left->so_ptr + (1 << j));
 294                                 if (j == order + 1) {
 295                                         ptr = so_left->so_ptr;
 296                                         diff = (unsigned long)((char*)ptr -
 297                                                         (char*)sh->sh_base) >> (order+1);
 298                                         sh->sh_map[order-order_start][diff>>3] |=
 299                                                         (1 << (diff & 0x7));
 300                                         *ptr++ = size;
 301                                         LDAP_LIST_INSERT_HEAD(
 302                                                         &sh->sh_free[j-1-order_start], so_right, so_link);
 303                                         LDAP_LIST_INSERT_HEAD(&sh->sh_sopool, so_left, so_link);
 304                                         return((void*)ptr);
 305                                 } else {
 306                                         LDAP_LIST_INSERT_HEAD(
 307                                                         &sh->sh_free[j-1-order_start], so_right, so_link);
 308                                         LDAP_LIST_INSERT_HEAD(
 309                                                         &sh->sh_free[j-1-order_start], so_left, so_link);
 310                                 }
 311                         }
 312                 }
 313                 /* FIXME: missing return; guessing we failed... */
 314         }
 315
 316         Debug(LDAP_DEBUG_TRACE,
 317                 "sl_malloc %lu: ch_malloc\n",
 318                 (unsigned long) size, 0, 0);
 319         return ch_malloc(size);
 320 }
 321
 322 void *
 323 slap_sl_calloc( ber_len_t n, ber_len_t size, void *ctx )
 324 {
 325         void *newptr;
 326
 327         newptr = slap_sl_malloc( n*size, ctx );
 328         if ( newptr ) {
 329                 memset( newptr, 0, n*size );
 330         }
 331         return newptr;
 332 }
 333
 334 void *
 335 slap_sl_realloc(void *ptr, ber_len_t size, void *ctx)
 336 {
 337         struct slab_heap *sh = ctx;
 338         ber_len_t oldsize, *p = (ber_len_t *) ptr;
 339         void *newptr;
 340
 341         if (ptr == NULL)
 342                 return slap_sl_malloc(size, ctx);
 343
 344 #ifdef SLAP_NO_SL_MALLOC
 345         newptr = ber_memrealloc_x( ptr, size, NULL );
 346         if ( newptr ) return newptr;
 347         assert( 0 );
 348         exit( EXIT_FAILURE );
 349 #endif
 350
 351         /* Not our memory? */
 352         if (!sh || ptr < sh->sh_base || ptr >= sh->sh_end) {
 353                 /* Like ch_realloc(), except not trying a new context */
 354                 newptr = ber_memrealloc_x(ptr, size, NULL);
 355                 if (newptr) {
 356                         return newptr;
 357                 }
 358                 Debug(LDAP_DEBUG_ANY, "ch_realloc of %lu bytes failed\n",
 359                         (unsigned long) size, 0, 0);
 360                 assert(0);
 361                 exit( EXIT_FAILURE );
 362         }
 363
 364         if (size == 0) {
 365                 slap_sl_free(ptr, ctx);
 366                 return NULL;
 367         }
 368
 369         oldsize = p[-1];
 370
 371         if (sh->sh_stack) {
 372                 /* Round up to doubleword boundary, add room for head */
 373                 size = ((size + Align-1) & -Align) + sizeof( ber_len_t );
 374
 375                 p--;
 376
 377                 /* Never shrink blocks */
 378                 if (size <= oldsize) {
 379                         return ptr;
 380
 381                 /* If reallocing the last block, try to grow it */
 382                 } else if ((char *) ptr + oldsize == sh->sh_last) {
 383                         if (size < (char *) sh->sh_end - (char *) ptr) {
 384                                 sh->sh_last = (char *) ptr + size;
 385                                 p[0] = size;
 386                                 p[size/sizeof(ber_len_t)] = size;
 387                                 return ptr;
 388                         }
 389
 390                 /* Nowhere to grow, need to alloc and copy */
 391                 } else {
 392                         /* Slight optimization of the final realloc variant */
 393                         size -= sizeof(ber_len_t);
 394                         oldsize -= sizeof(ber_len_t);
 395                         newptr = slap_sl_malloc(size, ctx);
 396                         AC_MEMCPY(newptr, ptr, oldsize);
 397                         /* Not last block, can just mark old region as free */
 398                         p[p[0]/sizeof(ber_len_t)] |= 1;
 399                         return newptr;
 400                 }
 401
 402                 size -= sizeof(ber_len_t);
 403                 oldsize -= sizeof(ber_len_t);
 404
 405         } else if (oldsize > size) {
 406                 oldsize = size;
 407         }
 408
 409         newptr = slap_sl_malloc(size, ctx);
 410         AC_MEMCPY(newptr, ptr, oldsize);
 411         slap_sl_free(ptr, ctx);
 412         return newptr;
 413 }
 414
 415 void
 416 slap_sl_free(void *ptr, void *ctx)
 417 {
 418         struct slab_heap *sh = ctx;
 419         ber_len_t size;
 420         ber_len_t *p = (ber_len_t *)ptr, *tmpp;
 421
 422         if (!ptr)
 423                 return;
 424
 425 #ifdef SLAP_NO_SL_MALLOC
 426         ber_memfree_x( ptr, NULL );
 427         return;
 428 #endif
 429
 430         if (!sh || ptr < sh->sh_base || ptr >= sh->sh_end) {
 431                 ber_memfree_x(ptr, NULL);
 432
 433         } else if (sh->sh_stack) {
 434                 size = p[-1];
 435                 p = (ber_len_t *) ((char *) ptr + size);
 436                 /* mark it free */
 437                 p[-1] = size |= 1;
 438                 /* reclaim free space off tail */
 439                 if (sh->sh_last == p) {
 440                         do {
 441                                 p = (ber_len_t *) ((char *) p - size + 1) - 1;
 442                                 size = p[-1];
 443                         } while (size & 1);
 444                         sh->sh_last = p;
 445                 }
 446
 447         } else {
 448                 int size_shift, order_size;
 449                 struct slab_object *so;
 450                 unsigned long diff;
 451                 int i, inserted = 0, order = -1;
 452
 453                 size = *(--p);
 454                 size_shift = size + sizeof(ber_len_t) - 1;
 455                 do {
 456                         order++;
 457                 } while (size_shift >>= 1);
 458
 459                 for (i = order, tmpp = p; i <= sh->sh_maxorder; i++) {
 460                         order_size = 1 << (i+1);
 461                         diff = (unsigned long)((char*)tmpp - (char*)sh->sh_base) >> (i+1);
 462                         sh->sh_map[i-order_start][diff>>3] &= (~(1 << (diff & 0x7)));
 463                         if (diff == ((diff>>1)<<1)) {
 464                                 if (!(sh->sh_map[i-order_start][(diff+1)>>3] &
 465                                                 (1<<((diff+1)&0x7)))) {
 466                                         so = LDAP_LIST_FIRST(&sh->sh_free[i-order_start]);
 467                                         while (so) {
 468                                                 if ((char*)so->so_ptr == (char*)tmpp) {
 469                                                         LDAP_LIST_REMOVE( so, so_link );
 470                                                 } else if ((char*)so->so_ptr ==
 471                                                                 (char*)tmpp + order_size) {
 472                                                         LDAP_LIST_REMOVE(so, so_link);
 473                                                         break;
 474                                                 }
 475                                                 so = LDAP_LIST_NEXT(so, so_link);
 476                                         }
 477                                         if (so) {
 478                                                 if (i < sh->sh_maxorder) {
 479                                                         inserted = 1;
 480                                                         so->so_ptr = tmpp;
 481                                                         LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start+1],
 482                                                                         so, so_link);
 483                                                 }
 484                                                 continue;
 485                                         } else {
 486                                                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 487                                                         slap_replenish_sopool(sh);
 488                                                 }
 489                                                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
 490                                                 LDAP_LIST_REMOVE(so, so_link);
 491                                                 so->so_ptr = tmpp;
 492                                                 LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start],
 493                                                                 so, so_link);
 494                                                 break;
 495
 496                                                 Debug(LDAP_DEBUG_TRACE, "slap_sl_free: "
 497                                                         "free object not found while bit is clear.\n",
 498                                                         0, 0, 0);
 499                                                 assert(so != NULL);
 500
 501                                         }
 502                                 } else {
 503                                         if (!inserted) {
 504                                                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 505                                                         slap_replenish_sopool(sh);
 506                                                 }
 507                                                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
 508                                                 LDAP_LIST_REMOVE(so, so_link);
 509                                                 so->so_ptr = tmpp;
 510                                                 LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start],
 511                                                                 so, so_link);
 512                                         }
 513                                         break;
 514                                 }
 515                         } else {
 516                                 if (!(sh->sh_map[i-order_start][(diff-1)>>3] &
 517                                                 (1<<((diff-1)&0x7)))) {
 518                                         so = LDAP_LIST_FIRST(&sh->sh_free[i-order_start]);
 519                                         while (so) {
 520                                                 if ((char*)so->so_ptr == (char*)tmpp) {
 521                                                         LDAP_LIST_REMOVE(so, so_link);
 522                                                 } else if ((char*)tmpp == (char *)so->so_ptr + order_size) {
 523                                                         LDAP_LIST_REMOVE(so, so_link);
 524                                                         tmpp = so->so_ptr;
 525                                                         break;
 526                                                 }
 527                                                 so = LDAP_LIST_NEXT(so, so_link);
 528                                         }
 529                                         if (so) {
 530                                                 if (i < sh->sh_maxorder) {
 531                                                         inserted = 1;
 532                                                         LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start+1],                                                                    so, so_link);
 533                                                         continue;
 534                                                 }
 535                                         } else {
 536                                                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 537                                                         slap_replenish_sopool(sh);
 538                                                 }
 539                                                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
 540                                                 LDAP_LIST_REMOVE(so, so_link);
 541                                                 so->so_ptr = tmpp;
 542                                                 LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start],
 543                                                                 so, so_link);
 544                                                 break;
 545
 546                                                 Debug(LDAP_DEBUG_TRACE, "slap_sl_free: "
 547                                                         "free object not found while bit is clear.\n",
 548                                                         0, 0, 0 );
 549                                                 assert(so != NULL);
 550
 551                                         }
 552                                 } else {
 553                                         if ( !inserted ) {
 554                                                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 555                                                         slap_replenish_sopool(sh);
 556                                                 }
 557                                                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
 558                                                 LDAP_LIST_REMOVE(so, so_link);
 559                                                 so->so_ptr = tmpp;
 560                                                 LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start],
 561                                                                 so, so_link);
 562                                         }
 563                                         break;
 564                                 }
 565                         }
 566                 }
 567         }
 568 }
 569
 570 void *
 571 slap_sl_context( void *ptr )
 572 {
 573         void *memctx;
 574         struct slab_heap *sh;
 575
 576         if ( slapMode & SLAP_TOOL_MODE ) return NULL;
 577
 578         sh = GET_MEMCTX(ldap_pvt_thread_pool_context(), &memctx);
 579         if (sh && ptr >= sh->sh_base && ptr <= sh->sh_end) {
 580                 return sh;
 581         }
 582         return NULL;
 583 }
 584
 585 static struct slab_object *
 586 slap_replenish_sopool(
 587     struct slab_heap* sh
 588 )
 589 {
 590     struct slab_object *so_block;
 591     int i;
 592
 593     so_block = (struct slab_object *)ch_malloc(
 594                     SLAP_SLAB_SOBLOCK * sizeof(struct slab_object));
 595
 596     if ( so_block == NULL ) {
 597         return NULL;
 598     }
 599
 600     so_block[0].so_blockhead = 1;
 601     LDAP_LIST_INSERT_HEAD(&sh->sh_sopool, &so_block[0], so_link);
 602     for (i = 1; i < SLAP_SLAB_SOBLOCK; i++) {
 603         so_block[i].so_blockhead = 0;
 604         LDAP_LIST_INSERT_HEAD(&sh->sh_sopool, &so_block[i], so_link );
 605     }
 606
 607     return so_block;
 608 }
 609
 610 #ifdef SLAPD_UNUSED
 611 static void
 612 print_slheap(int level, void *ctx)
 613 {
 614         struct slab_heap *sh = ctx;
 615         struct slab_object *so;
 616         int i, j, once = 0;
 617
 618         if (!ctx) {
 619                 Debug(level, "NULL memctx\n", 0, 0, 0);
 620                 return;
 621         }
 622
 623         Debug(level, "sh->sh_maxorder=%d\n", sh->sh_maxorder, 0, 0);
 624
 625         for (i = order_start; i <= sh->sh_maxorder; i++) {
 626                 once = 0;
 627                 Debug(level, "order=%d\n", i, 0, 0);
 628                 for (j = 0; j < (1<<(sh->sh_maxorder-i))/8; j++) {
 629                         Debug(level, "%02x ", sh->sh_map[i-order_start][j], 0, 0);
 630                         once = 1;
 631                 }
 632                 if (!once) {
 633                         Debug(level, "%02x ", sh->sh_map[i-order_start][0], 0, 0);
 634                 }
 635                 Debug(level, "\n", 0, 0, 0);
 636                 Debug(level, "free list:\n", 0, 0, 0);
 637                 so = LDAP_LIST_FIRST(&sh->sh_free[i-order_start]);
 638                 while (so) {
 639                         Debug(level, "%p\n", so->so_ptr, 0, 0);
 640                         so = LDAP_LIST_NEXT(so, so_link);
 641                 }
 642         }
 643 }
 644 #endif