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/* TMP_ALLOC routines using malloc in a reentrant fashion.
Copyright 2000, 2001 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
/* Each TMP_ALLOC uses __gmp_allocate_func to get a block of memory of the
size requested, plus a header at the start which is used to hold the
blocks on a linked list in the marker variable, ready for TMP_FREE to
release.
Callers should try to do multiple allocs with one call, in the style of
TMP_ALLOC_LIMBS_2 if it's easy to arrange, since that will keep down the
number of separate malloc calls.
Enhancements:
Could inline both TMP_ALLOC and TMP_FREE, though TMP_ALLOC would need the
compiler to have "inline" since it returns a value. The calls to malloc
will be slow though, so it hardly seems worth worrying about one extra
level of function call. */
#define HSIZ ROUND_UP_MULTIPLE (sizeof (struct tmp_reentrant_t), __TMP_ALIGN)
void *
__gmp_tmp_reentrant_alloc (struct tmp_reentrant_t **markp, size_t size)
{
char *p;
size_t total_size;
#define P ((struct tmp_reentrant_t *) p)
total_size = size + HSIZ;
p = (*__gmp_allocate_func) (total_size);
P->size = total_size;
P->next = *markp;
*markp = P;
return p + HSIZ;
}
void
__gmp_tmp_reentrant_free (struct tmp_reentrant_t *mark)
{
struct tmp_reentrant_t *next;
while (mark != NULL)
{
next = mark->next;
(*__gmp_free_func) ((char *) mark, mark->size);
mark = next;
}
}
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