From 82528f46ece4b8ef8cf1a1fe370349ea6301b2c0 Mon Sep 17 00:00:00 2001 From: Kevin Ryde Date: Tue, 19 Jun 2001 22:35:50 +0200 Subject: * tal-reent.c: New file. By the way, "tal" stands for temporary alloc. Pretty dumb name really, but tmp-reent.c might look like its a temporary file, not a file for temporary allocs! --- tal-reent.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 tal-reent.c (limited to 'tal-reent.c') diff --git a/tal-reent.c b/tal-reent.c new file mode 100644 index 000000000..003f264ae --- /dev/null +++ b/tal-reent.c @@ -0,0 +1,73 @@ +/* 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 2.1 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; see the file COPYING.LIB. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +MA 02111-1307, USA. */ + +#include +#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; + } +} -- cgit v1.2.1