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 either:
9
10  * the GNU Lesser General Public License as published by the Free
11    Software Foundation; either version 3 of the License, or (at your
12    option) any later version.
13
14or
15
16  * the GNU General Public License as published by the Free Software
17    Foundation; either version 2 of the License, or (at your option) any
18    later version.
19
20or both in parallel, as here.
21
22The GNU MP Library is distributed in the hope that it will be useful, but
23WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
25for more details.
26
27You should have received copies of the GNU General Public License and the
28GNU Lesser General Public License along with the GNU MP Library.  If not,
29see https://www.gnu.org/licenses/.  */
30
31#include <stdio.h>
32#include "gmp-impl.h"
33
34
35/* Each TMP_ALLOC uses __gmp_allocate_func to get a block of memory of the
36   size requested, plus a header at the start which is used to hold the
37   blocks on a linked list in the marker variable, ready for TMP_FREE to
38   release.
39
40   Callers should try to do multiple allocs with one call, in the style of
41   TMP_ALLOC_LIMBS_2 if it's easy to arrange, since that will keep down the
42   number of separate malloc calls.
43
44   Enhancements:
45
46   Could inline both TMP_ALLOC and TMP_FREE, though TMP_ALLOC would need the
47   compiler to have "inline" since it returns a value.  The calls to malloc
48   will be slow though, so it hardly seems worth worrying about one extra
49   level of function call.  */
50
51
52#define HSIZ   ROUND_UP_MULTIPLE (sizeof (struct tmp_reentrant_t), __TMP_ALIGN)
53
54void *
55__gmp_tmp_reentrant_alloc (struct tmp_reentrant_t **markp, size_t size)
56{
57  char    *p;
58  size_t  total_size;
59
60#define P   ((struct tmp_reentrant_t *) p)
61
62  total_size = size + HSIZ;
63  p = __GMP_ALLOCATE_FUNC_TYPE (total_size, char);
64  P->size = total_size;
65  P->next = *markp;
66  *markp = P;
67  return p + HSIZ;
68}
69
70void
71__gmp_tmp_reentrant_free (struct tmp_reentrant_t *mark)
72{
73  struct tmp_reentrant_t  *next;
74
75  while (mark != NULL)
76    {
77      next = mark->next;
78      (*__gmp_free_func) ((char *) mark, mark->size);
79      mark = next;
80    }
81}
82