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/*
* private-gc.h - private declarations for garbage collection.
*
* Copyright (C) 2002, 03, 04, 05, 06, 07 Free Software Foundation, Inc.
*
* This 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.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef PRIVATE_GC
#define PRIVATE_GC
#include "_scm.h"
/* {heap tuning parameters}
*
* These are parameters for controlling memory allocation. The heap
* is the area out of which scm_cons, and object headers are allocated.
*
* Each heap cell is 8 bytes on a 32 bit machine and 16 bytes on a
* 64 bit machine. The units of the _SIZE parameters are bytes.
* Cons pairs and object headers occupy one heap cell.
*
* SCM_INIT_HEAP_SIZE is the initial size of heap. If this much heap is
* allocated initially the heap will grow by half its current size
* each subsequent time more heap is needed.
*
* If SCM_INIT_HEAP_SIZE heap cannot be allocated initially, SCM_HEAP_SEG_SIZE
* will be used, and the heap will grow by SCM_HEAP_SEG_SIZE when more
* heap is needed. SCM_HEAP_SEG_SIZE must fit into type size_t. This code
* is in scm_init_storage() and alloc_some_heap() in sys.c
*
* If SCM_INIT_HEAP_SIZE can be allocated initially, the heap will grow by
* SCM_EXPHEAP(scm_heap_size) when more heap is needed.
*
* SCM_MIN_HEAP_SEG_SIZE is minimum size of heap to accept when more heap
* is needed.
*/
/*
* Heap size 45000 and 40% min yield gives quick startup and no extra
* heap allocation. Having higher values on min yield may lead to
* large heaps, especially if code behaviour is varying its
* maximum consumption between different freelists.
*/
/*
These values used to be global C variables. However, they're also
available through the environment, and having a double interface is
confusing. Now they're #defines --hwn.
*/
#define SCM_DEFAULT_INIT_HEAP_SIZE_1 256*1024
#define SCM_DEFAULT_MIN_YIELD_1 40
#define SCM_DEFAULT_INIT_HEAP_SIZE_2 32*1024
/* The following value may seem large, but note that if we get to GC at
* all, this means that we have a numerically intensive application
*/
#define SCM_DEFAULT_MIN_YIELD_2 40
#define SCM_DEFAULT_MAX_SEGMENT_SIZE (20*1024*1024L)
#define SCM_MIN_HEAP_SEG_SIZE (8 * SCM_GC_SIZEOF_CARD)
#define SCM_HEAP_SEG_SIZE (16384L * sizeof (scm_t_cell))
#define SCM_DOUBLECELL_ALIGNED_P(x) (((2 * sizeof (scm_t_cell) - 1) & SCM_UNPACK (x)) == 0)
#define SCM_GC_CARD_BVEC_SIZE_IN_LONGS \
((SCM_GC_CARD_N_CELLS + SCM_C_BVEC_LONG_BITS - 1) / SCM_C_BVEC_LONG_BITS)
#define SCM_GC_IN_CARD_HEADERP(x) \
(scm_t_cell *) (x) < SCM_GC_CELL_CARD (x) + SCM_GC_CARD_N_HEADER_CELLS
int scm_getenv_int (const char *var, int def);
typedef enum { return_on_error, abort_on_error } policy_on_error;
#define SCM_MAX(A, B) ((A) > (B) ? (A) : (B))
#define SCM_MIN(A, B) ((A) < (B) ? (A) : (B))
/* CELL_P checks a random word whether it has the right form for a
pointer to a cell. Use scm_i_find_heap_segment_containing_object
to find out whether it actually points to a real cell.
The right form for a cell pointer is this: the low three bits must
be scm_tc3_cons, and when the scm_tc3_cons tag is stripped, the
resulting pointer must be correctly aligned.
scm_i_initialize_heap_segment_data guarantees that the test below
works.
*/
#define CELL_P(x) ((SCM_UNPACK(x) & (sizeof(scm_t_cell)-1)) == scm_tc3_cons)
/*
gc-mark
*/
void scm_mark_all (void);
char const *scm_i_tag_name (scm_t_bits tag); /* MOVEME */
extern long int scm_i_deprecated_memory_return;
/*
global init funcs.
*/
void scm_gc_init_malloc (void);
void scm_gc_init_freelist (void);
void scm_gc_init_segments (void);
void scm_gc_init_mark (void);
#endif
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