From ae97a89e1a1a9833080dccc81f6cd26784e1b964 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Thu, 11 Jan 2001 11:42:17 +0000
Subject: A large update from Manuel Novoa III <mnovoa3@bellsouth.net>.

---
 libc/stdlib/malloc-930716/malloc.h | 107 +++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 libc/stdlib/malloc-930716/malloc.h

(limited to 'libc/stdlib/malloc-930716/malloc.h')

diff --git a/libc/stdlib/malloc-930716/malloc.h b/libc/stdlib/malloc-930716/malloc.h
new file mode 100644
index 000000000..34458c062
--- /dev/null
+++ b/libc/stdlib/malloc-930716/malloc.h
@@ -0,0 +1,107 @@
+/* malloc.h - declarations for the allocator.
+   Copyright (c) 1989, 1993  Michael J. Haertel
+   You may redistribute this library under the terms of the
+   GNU Library General Public License (version 2 or any later
+   version) as published by the Free Software Foundation.
+   THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED
+   WARRANTY.  IN PARTICULAR, THE AUTHOR MAKES NO REPRESENTATION OR
+   WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS
+   SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */
+
+#include <sys/cdefs.h>
+
+/* Underlying allocation function; successive calls should return
+   contiguous pieces of memory. */
+extern void *(*__morecore)(long);
+
+/* Default value of previous. */
+extern void *__default_morecore_init(long);
+extern void *__default_morecore(long);
+
+/* The allocator divides the heap into blocks of fixed size; large
+   requests receive one or more whole blocks, and small requests
+   receive a fragment of a block.  Fragment sizes are powers of two,
+   and all fragments of a block are the same size.  When all the
+   fragments in a block have been freed, the block itself is freed.
+   WARNING: BLOCKSIZE must be set greater than or equal to the
+   machine's page size for valloc() to work correctly.  The default
+   definition here is 4096 bytes. */
+#define INT_BIT (CHAR_BIT * sizeof (int))
+#define BLOCKLOG (INT_BIT > 16 ? 12 : 9)
+#define BLOCKSIZE (1 << BLOCKLOG)
+#define BLOCKIFY(SIZE) (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE)
+
+/* Determine the amount of memory spanned by the initial heap table
+   (not an absolute limit). */
+#define HEAP (INT_BIT > 16 ? 4194304 : 65536)
+
+/* Number of contiguous free blocks allowed to build up at the end of
+   memory before they will be returned to the system. */
+#define FINAL_FREE_BLOCKS 8
+
+/* Data structure giving per-block information. */
+union info {
+    struct {
+	int type;		/* Zero for a large block, or positive
+				   giving the logarithm to the base two
+				   of the fragment size. */
+	union {
+	    struct {
+		int nfree;	/* Free fragments in a fragmented block. */
+		int first;	/* First free fragment of the block. */
+	    } frag;
+	    int size;		/* Size (in blocks) of a large cluster. */
+	} info;
+    } busy;
+    struct {
+	int size;		/* Size (in blocks) of a free cluster. */
+	int next;		/* Index of next free cluster. */
+	int prev;		/* Index of previous free cluster. */
+    } free;
+};
+
+/* Pointer to first block of the heap. */
+extern char *_heapbase;
+
+/* Table indexed by block number giving per-block information. */
+extern union info *_heapinfo;
+
+/* Address to block number and vice versa. */
+#define BLOCK(A) (((char *) (A) - _heapbase) / BLOCKSIZE + 1)
+#define ADDRESS(B) ((void *) (((B) - 1) * BLOCKSIZE + _heapbase))
+
+/* Current search index for the heap table. */
+extern int _heapindex;
+
+/* Limit of valid info table indices. */
+extern int _heaplimit;
+
+/* Doubly linked lists of free fragments. */
+struct list {
+    struct list *next;
+    struct list *prev;
+};
+
+/* Count of blocks for each fragment size. */
+extern int _fragblocks[];
+
+/* Free list headers for each fragment size. */
+extern struct list _fraghead[];
+
+/* List of blocks allocated with `memalign' (or `valloc').  */
+struct alignlist
+{ 
+  struct alignlist *next;
+  __ptr_t aligned;	/* The address that memaligned returned.  */
+  __ptr_t exact;	/* The address that malloc returned.  */
+};
+extern struct alignlist *_aligned_blocks;
+
+extern void _free_internal __P ((__ptr_t __ptr));
+
+extern void free (void *);
+extern void * malloc (size_t);
+extern void * calloc (size_t, size_t);
+extern void * valloc (size_t);
+extern void * memalign (size_t, size_t);
+extern void * realloc (void *, size_t);
-- 
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