--- /dev/null
+++ Libc/Libc-320/gen/scalable_malloc.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#import <malloc/malloc.h>
+
+#define SCALABLE_MALLOC_ADD_GUARD_PAGES		(1 << 0)
+    // add a guard page before and after each VM region to help debug
+#define SCALABLE_MALLOC_DONT_PROTECT_PRELUDE	(1 << 1)
+    // do not protect prelude page
+#define SCALABLE_MALLOC_DONT_PROTECT_POSTLUDE	(1 << 2)
+    // do not protect postlude page
+#define SCALABLE_MALLOC_DO_SCRIBBLE		(1 << 3)
+    // write 0x55 onto free blocks
+
+extern malloc_zone_t *create_scalable_zone(size_t initial_size, unsigned debug_flags);
+    /* Create a new zone that scales for small objects or large objects */
+
+/*****	Private API for debug and performance tools	********/
+
+extern boolean_t scalable_zone_statistics(malloc_zone_t *zone, malloc_statistics_t *stats, unsigned subzone);
+    /* Fills stats with some statistics;
+    1 is returned on success; else 0 is returned
+    Currently: subzone=0 => tiny; subzone=1 => small; subzone=2 => large; subzone=3 => huge; any other subzone => returns 0 
+    */
+