+
−/* Fixed-size block allocator.
+
−   Copyright (C) 1994 Free Software Foundation, Inc.
+
−
+
−This file is part of XEmacs.
+
−
+
−XEmacs is free software; you can redistribute it and/or modify it
+
−under the terms of the GNU General Public License as published by the
+
−Free Software Foundation; either version 2, or (at your option) any
+
−later version.
+
−
+
−XEmacs 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 General Public License
+
−for more details.
+
−
+
−You should have received a copy of the GNU General Public License
+
−along with XEmacs; see the file COPYING.  If not, write to
+
−the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+
−Boston, MA 02111-1307, USA.
+
−*/
+
−
+
−/* Synched up with: Not in FSF. */
+
−
+
−/* Authorship:
+
−
+
−   Ben Wing: December 1994, for 19.12.
+
− */
+
−
+
−/*
+
−
+
−------------------------------------------------------------------------------
+
−
+
−A "block-type object" is used to efficiently allocate and free blocks
+
−of a particular size.  Freed blocks are remembered in a free list and
+
−are reused as necessary to allocate new blocks, so as to avoid as
+
−much as possible making calls to malloc() and free().
+
−
+
−This is a container object.  Declare a block-type object of a specific type
+
−as follows:
+
−
+
−struct mytype_blocktype {
+
−  Blocktype_declare (mytype);
+
−};
+
−
+
−Use the following functions/macros:
+
−
+
−   structype *Blocktype_new(structype)
+
−      [MACRO] Create a new block-type object of the specified type.
+
−      The argument to this call should be the type of object to be
+
−      created, e.g. foobar_blocktype.
+
−   type *Blocktype_alloc(b)
+
−      [MACRO] Allocate a block of the proper type for the specified
+
−      block-type object and return a pointer to it.
+
−   Blocktype_free(b, block)
+
−      Free a block of the type corresponding to the specified block-type
+
−      object.
+
−   Blocktype_delete(b)
+
−      Destroy a block-type object and the memory allocated to it.
+
−
+
−*/
+
−
+
−/* This file has been Mule-ized. */
+
−
+
−#include <config.h>
+
−#include "lisp.h"
+
−
+
−#include "blocktype.h"
+
−
+
−typedef struct blocktype
+
−{
+
−  Blocktype_declare (void);
+
−} Blocktype;
+
−
+
−struct block_internal
+
−{
+
−  void *next;
+
−};
+
−
+
−void *
+
−Blocktype_newf (Bytecount elsize)
+
−{
+
−  Blocktype *b = xnew (Blocktype);
+
−  b->elsize = max (elsize, (Bytecount) sizeof (void *));
+
−  b->free = 0;
+
−  return (void *) b;
+
−}
+
−
+
−void
+
−Blocktype_allocf (void *bbb)
+
−{
+
−  Blocktype *b = (Blocktype *) bbb;
+
−  if (b->free)
+
−    {
+
−      b->tempel = b->free;
+
−      b->free = ((struct block_internal *) (b->free))->next;
+
−    }
+
−  else
+
−    b->tempel = (void *) xmalloc (b->elsize);
+
−}
+
−
+
−void
+
−Blocktype_free (void *bbb, void *el)
+
−{
+
−  Blocktype *b = (Blocktype *) bbb;
+
−  ((struct block_internal *) el)->next = b->free;
+
−  b->free = el;
+
−}