74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
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/* TMP_ALLOC routines using malloc in a reentrant fashion.
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Copyright 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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/* Each TMP_ALLOC uses __gmp_allocate_func to get a block of memory of the
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size requested, plus a header at the start which is used to hold the
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blocks on a linked list in the marker variable, ready for TMP_FREE to
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release.
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Callers should try to do multiple allocs with one call, in the style of
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TMP_ALLOC_LIMBS_2 if it's easy to arrange, since that will keep down the
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number of separate malloc calls.
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Enhancements:
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Could inline both TMP_ALLOC and TMP_FREE, though TMP_ALLOC would need the
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compiler to have "inline" since it returns a value. The calls to malloc
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will be slow though, so it hardly seems worth worrying about one extra
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level of function call. */
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#define HSIZ ROUND_UP_MULTIPLE (sizeof (struct tmp_reentrant_t), __TMP_ALIGN)
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void *
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__gmp_tmp_reentrant_alloc (struct tmp_reentrant_t **markp, size_t size)
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{
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char *p;
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size_t total_size;
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#define P ((struct tmp_reentrant_t *) p)
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total_size = size + HSIZ;
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p = (*__gmp_allocate_func) (total_size);
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P->size = total_size;
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P->next = *markp;
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*markp = P;
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return p + HSIZ;
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}
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void
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__gmp_tmp_reentrant_free (struct tmp_reentrant_t *mark)
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{
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struct tmp_reentrant_t *next;
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while (mark != NULL)
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{
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next = mark->next;
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(*__gmp_free_func) ((char *) mark, mark->size);
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mark = next;
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}
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}
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