gen/scalable_malloc.h

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 #import <malloc/malloc.h>
  27
  28 #define SCALABLE_MALLOC_ADD_GUARD_PAGES         (1 << 0)
  29     // add a guard page before and after each VM region to help debug
  30 #define SCALABLE_MALLOC_DONT_PROTECT_PRELUDE    (1 << 1)
  31     // do not protect prelude page
  32 #define SCALABLE_MALLOC_DONT_PROTECT_POSTLUDE   (1 << 2)
  33     // do not protect postlude page
  34 #define SCALABLE_MALLOC_DO_SCRIBBLE             (1 << 3)
  35     // write 0x55 onto free blocks
  36
  37 extern malloc_zone_t *create_scalable_zone(size_t initial_size, unsigned debug_flags);
  38     /* Create a new zone that scales for small objects or large objects */
  39
  40 /*****  Private API for debug and performance tools     ********/
  41
  42 extern boolean_t scalable_zone_statistics(malloc_zone_t *zone, malloc_statistics_t *stats, unsigned subzone);
  43     /* Fills stats with some statistics;
  44     1 is returned on success; else 0 is returned
  45     Currently: subzone=0 => tiny; subzone=1 => small; subzone=2 => large; subzone=3 => huge; any other subzone => returns 0
  46     */
  47