[bpt/guile.git] / libguile / private-gc.h

/*
 * private-gc.h - private declarations for garbage collection.
 * 
 * Copyright (C) 2002, 03, 04, 05, 06, 07, 08 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_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

/*
  How many cells to collect during one sweep call. This is the pool
  size of each thread.
 */
#define DEFAULT_SWEEP_AMOUNT 512

/* 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_i_uint_bit_count (unsigned int u);
int scm_getenv_int (const char *var, int def);


typedef enum { return_on_error, abort_on_error } policy_on_error;

/* gc-freelist */

/*
  FREELIST:

  A struct holding GC statistics on a particular type of cells.

  Counts in cells are mainly for heap statistics, and for
  double-cells, they are still measured in single-cell units.
*/
typedef struct scm_t_cell_type_statistics {
  /*
    heap segment where the last cell was allocated 
  */
  int heap_segment_idx;

  /* defines min_yield as fraction of total heap size
   */
  float min_yield_fraction;
  
  /* number of cells per object on this list */
  int span;

  /* number of collected cells during last GC. */
  unsigned long collected;

  unsigned long swept;
  
  /*
    Total number of cells in heap segments belonging to this list.
   */
  unsigned long heap_total_cells;
} scm_t_cell_type_statistics;


/* Sweep statistics.  */
typedef struct scm_sweep_statistics
{
  /* Number of cells "swept", i.e., visited during the sweep operation.  */
  unsigned swept;

  /* Number of cells collected during the sweep operation.  This number must
     always be lower than or equal to SWEPT.  */
  unsigned collected;
} scm_t_sweep_statistics;

SCM_INTERNAL scm_t_sweep_statistics scm_i_gc_sweep_stats;

\f
extern scm_t_cell_type_statistics scm_i_master_freelist;
extern scm_t_cell_type_statistics scm_i_master_freelist2;

SCM_INTERNAL
void scm_i_adjust_min_yield (scm_t_cell_type_statistics *freelist,
			     scm_t_sweep_statistics sweep_stats,
			     scm_t_sweep_statistics sweep_stats_1);
SCM_INTERNAL
void scm_i_gc_sweep_freelist_reset (scm_t_cell_type_statistics *freelist);
SCM_INTERNAL float
scm_i_gc_heap_size_delta (scm_t_cell_type_statistics * freelist);


#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
 */

/* this can be used to ensure that set/clear gc marks only happen when
   allowed. */
int scm_i_marking;

void scm_mark_all (void);

/*
gc-segment:
*/

/*

 Cells are stored in a heap-segment: it is a contiguous chunk of
 memory, that associated with one freelist. 
*/
typedef struct scm_t_heap_segment
{
  /*
    {lower, upper} bounds of the segment

    The upper bound is also the start of the mark space.
  */
  scm_t_cell *bounds[2];

  /*
    If we ever decide to give it back, we could do it with this ptr.

    Note that giving back memory is not very useful; as long we don't
    touch a chunk of memory, the virtual memory system will keep it
    swapped out. We could simply forget about a block.

    (not that we do that, but anyway.) 
   */
  void *malloced;

  scm_t_cell *next_free_card;
  
  /* address of the head-of-freelist pointer for this segment's cells.
     All segments usually point to the same one, scm_i_freelist.  */
  scm_t_cell_type_statistics *freelist;
  
  /* number of cells per object in this segment */
  int span;

  /*
    Is this the first time that the cells are accessed? 
   */
  int first_time;
} scm_t_heap_segment;

/*
  A table of segment records is kept that records the upper and
  lower extents of the segment;  this is used during the conservative
  phase of gc to identify probably gc roots (because they point
  into valid segments at reasonable offsets).
*/
extern scm_t_heap_segment ** scm_i_heap_segment_table;
extern size_t scm_i_heap_segment_table_size;


SCM_INTERNAL int scm_i_init_card_freelist (scm_t_cell * card, SCM *free_list,
					   scm_t_heap_segment*);
SCM_INTERNAL int scm_i_sweep_card (scm_t_cell *card, SCM *free_list,
				   scm_t_heap_segment *);
SCM_INTERNAL int scm_i_card_marked_count (scm_t_cell *card, int span);
SCM_INTERNAL void scm_i_card_statistics (scm_t_cell *p, SCM hashtab,
					 scm_t_heap_segment *seg);
SCM_INTERNAL char const *scm_i_tag_name (scm_t_bits tag); /* MOVEME */

SCM_INTERNAL int scm_i_initialize_heap_segment_data (scm_t_heap_segment *seg,
						     size_t requested);

SCM_INTERNAL int scm_i_segment_cells_per_card (scm_t_heap_segment *seg);
SCM_INTERNAL int scm_i_segment_card_number (scm_t_heap_segment *seg,
					    scm_t_cell *card);
SCM_INTERNAL int scm_i_segment_card_count (scm_t_heap_segment *seg);
SCM_INTERNAL int scm_i_segment_cell_count (scm_t_heap_segment *seg);
SCM_INTERNAL int scm_i_heap_segment_marked_count (scm_t_heap_segment *seg);
  
SCM_INTERNAL void scm_i_clear_segment_mark_space (scm_t_heap_segment *seg);
SCM_INTERNAL scm_t_heap_segment *
scm_i_make_empty_heap_segment (scm_t_cell_type_statistics*);
SCM_INTERNAL SCM scm_i_sweep_for_freelist (scm_t_cell_type_statistics *seg);
SCM_INTERNAL SCM scm_i_sweep_some_cards (scm_t_heap_segment *seg,
					 scm_t_sweep_statistics *sweep_stats,
					 int threshold);
SCM_INTERNAL void scm_i_sweep_segment (scm_t_heap_segment *seg,
				       scm_t_sweep_statistics *sweep_stats);

SCM_INTERNAL void scm_i_heap_segment_statistics (scm_t_heap_segment *seg,
						 SCM tab);


SCM_INTERNAL int scm_i_insert_segment (scm_t_heap_segment *seg);
SCM_INTERNAL int scm_i_find_heap_segment_containing_object (SCM obj);
SCM_INTERNAL int scm_i_get_new_heap_segment (scm_t_cell_type_statistics *freelist,
					     size_t length, 
					     policy_on_error);
SCM_INTERNAL int scm_i_marked_count (void);
SCM_INTERNAL void scm_i_clear_mark_space (void);
SCM_INTERNAL void scm_i_sweep_segments (void);
SCM_INTERNAL SCM scm_i_sweep_some_segments (scm_t_cell_type_statistics *fl,
					    scm_t_sweep_statistics *sweep_stats);
SCM_INTERNAL void scm_i_reset_segments (void);
SCM_INTERNAL void scm_i_sweep_all_segments (char const *reason,
					    scm_t_sweep_statistics *sweep_stats);
SCM_INTERNAL SCM scm_i_all_segments_statistics (SCM hashtab);
SCM_INTERNAL unsigned long *scm_i_segment_table_info(int *size);

extern long int scm_i_deprecated_memory_return;
extern long int scm_i_find_heap_calls;

/*
  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
Commit	Line	Data
c7743d02	1	/*
cb90e2cb HWN	2	* private-gc.h - private declarations for garbage collection.
cb90e2cb HWN	3	*
102dbb6f	4	* Copyright (C) 2002, 03, 04, 05, 06, 07, 08 Free Software Foundation, Inc.
cb90e2cb HWN	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2.1 of the License, or (at your option) any later version.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with this library; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
c7743d02 HWN	20
	21	#ifndef PRIVATE_GC
	22	#define PRIVATE_GC
	23
	24	#include "_scm.h"
	25
	26	/* {heap tuning parameters}
	27	*
	28	* These are parameters for controlling memory allocation. The heap
	29	* is the area out of which scm_cons, and object headers are allocated.
	30	*
	31	* Each heap cell is 8 bytes on a 32 bit machine and 16 bytes on a
	32	* 64 bit machine. The units of the _SIZE parameters are bytes.
	33	* Cons pairs and object headers occupy one heap cell.
	34	*
c7743d02 HWN	35	* SCM_MIN_HEAP_SEG_SIZE is minimum size of heap to accept when more heap
	36	* is needed.
	37	*/
	38
	39
	40	/*
	41	* Heap size 45000 and 40% min yield gives quick startup and no extra
	42	* heap allocation. Having higher values on min yield may lead to
	43	* large heaps, especially if code behaviour is varying its
	44	* maximum consumption between different freelists.
	45	*/
	46
	47	/*
	48	These values used to be global C variables. However, they're also
	49	available through the environment, and having a double interface is
	50	confusing. Now they're #defines --hwn.
	51	*/
	52
	53	#define SCM_DEFAULT_INIT_HEAP_SIZE_1 256*1024
	54	#define SCM_DEFAULT_MIN_YIELD_1 40
	55	#define SCM_DEFAULT_INIT_HEAP_SIZE_2 32*1024
	56
82ae1b8e HWN	57	/*
	58	How many cells to collect during one sweep call. This is the pool
	59	size of each thread.
	60	*/
	61	#define DEFAULT_SWEEP_AMOUNT 512
	62
c7743d02 HWN	63	/* The following value may seem large, but note that if we get to GC at
	64	* all, this means that we have a numerically intensive application
	65	*/
	66	#define SCM_DEFAULT_MIN_YIELD_2 40
322a2bf7 MV	67
322a2bf7 MV	68	#define SCM_DEFAULT_MAX_SEGMENT_SIZE (2010241024L)
c7743d02	69
c7743d02 HWN	70	#define SCM_MIN_HEAP_SEG_SIZE (8 * SCM_GC_SIZEOF_CARD)
	71	#define SCM_HEAP_SEG_SIZE (16384L * sizeof (scm_t_cell))
	72
1383773b	73	#define SCM_DOUBLECELL_ALIGNED_P(x) (((2 * sizeof (scm_t_cell) - 1) & SCM_UNPACK (x)) == 0)
c7743d02 HWN	74
c7743d02 HWN	75
1383773b HWN	76	#define SCM_GC_CARD_BVEC_SIZE_IN_LONGS \
	77	((SCM_GC_CARD_N_CELLS + SCM_C_BVEC_LONG_BITS - 1) / SCM_C_BVEC_LONG_BITS)
	78	#define SCM_GC_IN_CARD_HEADERP(x) \
	79	(scm_t_cell *) (x) < SCM_GC_CELL_CARD (x) + SCM_GC_CARD_N_HEADER_CELLS
c7743d02	80
82ae1b8e	81	int scm_i_uint_bit_count (unsigned int u);
c7743d02 HWN	82	int scm_getenv_int (const char *var, int def);
	83
	84
	85	typedef enum { return_on_error, abort_on_error } policy_on_error;
	86
82ae1b8e	87	/* gc-freelist */
c7743d02 HWN	88
	89	/*
	90	FREELIST:
	91
	92	A struct holding GC statistics on a particular type of cells.
82ae1b8e HWN	93
	94	Counts in cells are mainly for heap statistics, and for
	95	double-cells, they are still measured in single-cell units.
c7743d02 HWN	96	*/
c7743d02 HWN	97	typedef struct scm_t_cell_type_statistics {
c7743d02 HWN	98	/*
	99	heap segment where the last cell was allocated
	100	*/
	101	int heap_segment_idx;
	102
82ae1b8e	103	/* defines min_yield as fraction of total heap size
c7743d02	104	*/
82ae1b8e	105	float min_yield_fraction;
c7743d02 HWN	106
	107	/* number of cells per object on this list */
	108	int span;
	109
82ae1b8e	110	/* number of collected cells during last GC. */
c7743d02 HWN	111	unsigned long collected;
c7743d02 HWN	112
82ae1b8e	113	unsigned long swept;
c2cbcc57	114
82ae1b8e HWN	115	/*
	116	Total number of cells in heap segments belonging to this list.
	117	*/
	118	unsigned long heap_total_cells;
c7743d02 HWN	119	} scm_t_cell_type_statistics;
	120
	121
4c7016dc HWN	122	/* Sweep statistics. */
	123	typedef struct scm_sweep_statistics
	124	{
	125	/* Number of cells "swept", i.e., visited during the sweep operation. */
	126	unsigned swept;
	127
	128	/* Number of cells collected during the sweep operation. This number must
82ae1b8e	129	always be lower than or equal to SWEPT. */
4c7016dc HWN	130	unsigned collected;
	131	} scm_t_sweep_statistics;
	132
82ae1b8e	133	SCM_INTERNAL scm_t_sweep_statistics scm_i_gc_sweep_stats;
4c7016dc	134
4c7016dc	135	\f
c7743d02 HWN	136	extern scm_t_cell_type_statistics scm_i_master_freelist;
c7743d02 HWN	137	extern scm_t_cell_type_statistics scm_i_master_freelist2;
c7743d02	138
102dbb6f	139	SCM_INTERNAL
4c7016dc	140	void scm_i_adjust_min_yield (scm_t_cell_type_statistics *freelist,
d9f71a07 LC	141	scm_t_sweep_statistics sweep_stats,
d9f71a07 LC	142	scm_t_sweep_statistics sweep_stats_1);
102dbb6f	143	SCM_INTERNAL
c7743d02	144	void scm_i_gc_sweep_freelist_reset (scm_t_cell_type_statistics *freelist);
82ae1b8e HWN	145	SCM_INTERNAL float
82ae1b8e HWN	146	scm_i_gc_heap_size_delta (scm_t_cell_type_statistics * freelist);
c7743d02 HWN	147
	148
	149	#define SCM_MAX(A, B) ((A) > (B) ? (A) : (B))
	150	#define SCM_MIN(A, B) ((A) < (B) ? (A) : (B))
	151
d3774e2c MV	152	/* CELL_P checks a random word whether it has the right form for a
	153	pointer to a cell. Use scm_i_find_heap_segment_containing_object
	154	to find out whether it actually points to a real cell.
	155
	156	The right form for a cell pointer is this: the low three bits must
	157	be scm_tc3_cons, and when the scm_tc3_cons tag is stripped, the
	158	resulting pointer must be correctly aligned.
	159	scm_i_initialize_heap_segment_data guarantees that the test below
	160	works.
	161	*/
	162	#define CELL_P(x) ((SCM_UNPACK(x) & (sizeof(scm_t_cell)-1)) == scm_tc3_cons)
c7743d02 HWN	163
	164	/*
	165	gc-mark
	166	*/
d09752ff HWN	167
	168	/* this can be used to ensure that set/clear gc marks only happen when
	169	allowed. */
	170	int scm_i_marking;
	171
c7743d02 HWN	172	void scm_mark_all (void);
c7743d02 HWN	173
c7743d02 HWN	174	/*
	175	gc-segment:
	176	*/
	177
c7743d02 HWN	178	/*
	179
	180	Cells are stored in a heap-segment: it is a contiguous chunk of
	181	memory, that associated with one freelist.
	182	*/
c7743d02 HWN	183	typedef struct scm_t_heap_segment
	184	{
	185	/*
	186	{lower, upper} bounds of the segment
	187
	188	The upper bound is also the start of the mark space.
	189	*/
	190	scm_t_cell *bounds[2];
	191
	192	/*
	193	If we ever decide to give it back, we could do it with this ptr.
	194
	195	Note that giving back memory is not very useful; as long we don't
	196	touch a chunk of memory, the virtual memory system will keep it
	197	swapped out. We could simply forget about a block.
	198
	199	(not that we do that, but anyway.)
	200	*/
82ae1b8e	201	void *malloced;
c7743d02	202
82ae1b8e	203	scm_t_cell *next_free_card;
c7743d02 HWN	204
	205	/* address of the head-of-freelist pointer for this segment's cells.
	206	All segments usually point to the same one, scm_i_freelist. */
	207	scm_t_cell_type_statistics *freelist;
	208
	209	/* number of cells per object in this segment */
	210	int span;
	211
c7743d02 HWN	212	/*
	213	Is this the first time that the cells are accessed?
	214	*/
	215	int first_time;
c7743d02 HWN	216	} scm_t_heap_segment;
c7743d02 HWN	217
c7743d02	218	/*
c7743d02 HWN	219	A table of segment records is kept that records the upper and
	220	lower extents of the segment; this is used during the conservative
	221	phase of gc to identify probably gc roots (because they point
	222	into valid segments at reasonable offsets).
c7743d02 HWN	223	*/
	224	extern scm_t_heap_segment ** scm_i_heap_segment_table;
	225	extern size_t scm_i_heap_segment_table_size;
	226
	227
102dbb6f LC	228	SCM_INTERNAL int scm_i_init_card_freelist (scm_t_cell * card, SCM *free_list,
	229	scm_t_heap_segment*);
	230	SCM_INTERNAL int scm_i_sweep_card (scm_t_cell card, SCM free_list,
	231	scm_t_heap_segment *);
82ae1b8e	232	SCM_INTERNAL int scm_i_card_marked_count (scm_t_cell *card, int span);
102dbb6f LC	233	SCM_INTERNAL void scm_i_card_statistics (scm_t_cell *p, SCM hashtab,
	234	scm_t_heap_segment *seg);
	235	SCM_INTERNAL char const scm_i_tag_name (scm_t_bits tag); / MOVEME */
	236
	237	SCM_INTERNAL int scm_i_initialize_heap_segment_data (scm_t_heap_segment *seg,
	238	size_t requested);
82ae1b8e HWN	239
	240	SCM_INTERNAL int scm_i_segment_cells_per_card (scm_t_heap_segment *seg);
	241	SCM_INTERNAL int scm_i_segment_card_number (scm_t_heap_segment *seg,
	242	scm_t_cell *card);
102dbb6f LC	243	SCM_INTERNAL int scm_i_segment_card_count (scm_t_heap_segment *seg);
102dbb6f LC	244	SCM_INTERNAL int scm_i_segment_cell_count (scm_t_heap_segment *seg);
82ae1b8e HWN	245	SCM_INTERNAL int scm_i_heap_segment_marked_count (scm_t_heap_segment *seg);
82ae1b8e HWN	246
102dbb6f LC	247	SCM_INTERNAL void scm_i_clear_segment_mark_space (scm_t_heap_segment *seg);
	248	SCM_INTERNAL scm_t_heap_segment *
	249	scm_i_make_empty_heap_segment (scm_t_cell_type_statistics*);
82ae1b8e	250	SCM_INTERNAL SCM scm_i_sweep_for_freelist (scm_t_cell_type_statistics *seg);
102dbb6f	251	SCM_INTERNAL SCM scm_i_sweep_some_cards (scm_t_heap_segment *seg,
82ae1b8e HWN	252	scm_t_sweep_statistics *sweep_stats,
82ae1b8e HWN	253	int threshold);
102dbb6f LC	254	SCM_INTERNAL void scm_i_sweep_segment (scm_t_heap_segment *seg,
	255	scm_t_sweep_statistics *sweep_stats);
	256
	257	SCM_INTERNAL void scm_i_heap_segment_statistics (scm_t_heap_segment *seg,
	258	SCM tab);
	259
	260
	261	SCM_INTERNAL int scm_i_insert_segment (scm_t_heap_segment *seg);
82ae1b8e HWN	262	SCM_INTERNAL int scm_i_find_heap_segment_containing_object (SCM obj);
	263	SCM_INTERNAL int scm_i_get_new_heap_segment (scm_t_cell_type_statistics *freelist,
	264	size_t length,
102dbb6f	265	policy_on_error);
82ae1b8e	266	SCM_INTERNAL int scm_i_marked_count (void);
102dbb6f LC	267	SCM_INTERNAL void scm_i_clear_mark_space (void);
	268	SCM_INTERNAL void scm_i_sweep_segments (void);
	269	SCM_INTERNAL SCM scm_i_sweep_some_segments (scm_t_cell_type_statistics *fl,
	270	scm_t_sweep_statistics *sweep_stats);
	271	SCM_INTERNAL void scm_i_reset_segments (void);
	272	SCM_INTERNAL void scm_i_sweep_all_segments (char const *reason,
	273	scm_t_sweep_statistics *sweep_stats);
	274	SCM_INTERNAL SCM scm_i_all_segments_statistics (SCM hashtab);
82ae1b8e	275	SCM_INTERNAL unsigned long scm_i_segment_table_info(int size);
c7743d02 HWN	276
c7743d02 HWN	277	extern long int scm_i_deprecated_memory_return;
40945e5e	278	extern long int scm_i_find_heap_calls;
c7743d02	279
c7743d02 HWN	280	/*
	281	global init funcs.
	282	*/
	283	void scm_gc_init_malloc (void);
	284	void scm_gc_init_freelist (void);
	285	void scm_gc_init_segments (void);
	286	void scm_gc_init_mark (void);
eab1b259 HWN	287
eab1b259 HWN	288
c7743d02	289	#endif