1/* TMP_ALLOC routines using malloc in a reentrant fashion.
2
3Copyright 2000, 2001 Free Software Foundation, Inc.
4
5This file is part of the GNU MP Library.
6
7The GNU MP Library is free software; you can redistribute it and/or modify
8it under the terms of the GNU Lesser General Public License as published by
9the Free Software Foundation; either version 3 of the License, or (at your
10option) any later version.
11
12The GNU MP Library is distributed in the hope that it will be useful, but
13WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15License for more details.
16
17You should have received a copy of the GNU Lesser General Public License
18along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
19
20#include <stdio.h>
21#include "gmp.h"
22#include "gmp-impl.h"
23
24
25/* Each TMP_ALLOC uses __gmp_allocate_func to get a block of memory of the
26   size requested, plus a header at the start which is used to hold the
27   blocks on a linked list in the marker variable, ready for TMP_FREE to
28   release.
29
30   Callers should try to do multiple allocs with one call, in the style of
31   TMP_ALLOC_LIMBS_2 if it's easy to arrange, since that will keep down the
32   number of separate malloc calls.
33
34   Enhancements:
35
36   Could inline both TMP_ALLOC and TMP_FREE, though TMP_ALLOC would need the
37   compiler to have "inline" since it returns a value.  The calls to malloc
38   will be slow though, so it hardly seems worth worrying about one extra
39   level of function call.  */
40
41
42#define HSIZ   ROUND_UP_MULTIPLE (sizeof (struct tmp_reentrant_t), __TMP_ALIGN)
43
44void *
45__gmp_tmp_reentrant_alloc (struct tmp_reentrant_t **markp, size_t size)
46{
47  char    *p;
48  size_t  total_size;
49
50#define P   ((struct tmp_reentrant_t *) p)
51
52  total_size = size + HSIZ;
53  p = (*__gmp_allocate_func) (total_size);
54  P->size = total_size;
55  P->next = *markp;
56  *markp = P;
57  return p + HSIZ;
58}
59
60void
61__gmp_tmp_reentrant_free (struct tmp_reentrant_t *mark)
62{
63  struct tmp_reentrant_t  *next;
64
65  while (mark != NULL)
66    {
67      next = mark->next;
68      (*__gmp_free_func) ((char *) mark, mark->size);
69      mark = next;
70    }
71}
72