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/* Copyright (c) 2000 Shlomi Fish
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* meta_alloc.c - the Freecell Solver compact allocator based on the
* meta-allocator concept that is used to collect the pages allocated by
* the standard allocator after it is destroyed and to recycle them.
*
* Also see alloc.c.
*/
#define BUILDING_DLL 1
#include <stdlib.h>
#include <stdio.h>
#include "config.h"
#include "meta_alloc.h"
#define ALLOCED_SIZE (FCS_IA_PACK_SIZE*1024-(256+128))
void fc_solve_compact_allocator_init(
fcs_compact_allocator_t * allocator,
fcs_meta_compact_allocator_t * meta_allocator
)
{
allocator->old_list = NULL;
allocator->meta = meta_allocator;
fc_solve_compact_allocator_extend(allocator);
return;
}
#define OLD_LIST_NEXT(ptr) (*((char * *)(ptr)))
#define OLD_LIST_DATA(ptr) ((char *)(&(((char * *)(ptr))[1])))
static GCC_INLINE char * meta_request_new_buffer(
fcs_meta_compact_allocator_t * meta_allocator
)
{
if (meta_allocator->recycle_bin)
{
char * ret = meta_allocator->recycle_bin;
meta_allocator->recycle_bin = OLD_LIST_NEXT(ret);
return ret;
}
else
{
return malloc(ALLOCED_SIZE);
}
}
void fc_solve_compact_allocator_extend(
fcs_compact_allocator_t * allocator
)
{
char * new_data;
new_data = meta_request_new_buffer(allocator->meta);
OLD_LIST_NEXT(new_data) = allocator->old_list;
allocator->old_list = new_data;
allocator->ptr
= allocator->rollback_ptr
= OLD_LIST_DATA(new_data);
allocator->max_ptr = new_data + ALLOCED_SIZE;
}
void fc_solve_meta_compact_allocator_finish(fcs_meta_compact_allocator_t * meta_allocator)
{
char * iter, * iter_next;
for (
iter = meta_allocator->recycle_bin, iter_next = OLD_LIST_NEXT(iter)
;
iter_next
;
iter = iter_next , iter_next = OLD_LIST_NEXT(iter)
)
{
free(iter);
}
free(iter);
meta_allocator->recycle_bin = NULL;
}
void fc_solve_compact_allocator_finish(fcs_compact_allocator_t * allocator)
{
char * iter, * iter_next;
fcs_meta_compact_allocator_t * meta;
meta = allocator->meta;
/* Enqueue all the allocated buffers in the meta allocator for re-use.
* */
for (
iter = allocator->old_list, iter_next = OLD_LIST_NEXT(iter)
;
iter_next
;
iter = iter_next , iter_next = OLD_LIST_NEXT(iter)
)
{
OLD_LIST_NEXT(iter) = meta->recycle_bin;
meta->recycle_bin = iter;
}
OLD_LIST_NEXT(iter) = meta->recycle_bin;
meta->recycle_bin = iter;
}
#undef OLD_LIST_NEXT
#undef OLD_LIST_DATA
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