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b71c8ec90a
* libguile/gc.c (scm_i_gc): Change assert into printed warning. * libguile/private-gc.h (nil): introduce scm_i_last_marked_cell_count, as a private mechanism for maintaining cell counts. Remove variable scm_cells_allocated.
127 lines
3.9 KiB
C
127 lines
3.9 KiB
C
/*
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* private-gc.h - private declarations for garbage collection.
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*
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* Copyright (C) 2002, 03, 04, 05, 06, 07, 08 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef PRIVATE_GC
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#define PRIVATE_GC
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#include "_scm.h"
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/* {heap tuning parameters}
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*
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* These are parameters for controlling memory allocation. The heap
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* is the area out of which scm_cons, and object headers are allocated.
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*
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* Each heap cell is 8 bytes on a 32 bit machine and 16 bytes on a
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* 64 bit machine. The units of the _SIZE parameters are bytes.
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* Cons pairs and object headers occupy one heap cell.
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*
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* SCM_MIN_HEAP_SEG_SIZE is minimum size of heap to accept when more heap
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* is needed.
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*/
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/*
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* Heap size 45000 and 40% min yield gives quick startup and no extra
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* heap allocation. Having higher values on min yield may lead to
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* large heaps, especially if code behaviour is varying its
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* maximum consumption between different freelists.
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*/
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/*
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These values used to be global C variables. However, they're also
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available through the environment, and having a double interface is
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confusing. Now they're #defines --hwn.
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*/
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#define SCM_DEFAULT_INIT_HEAP_SIZE_1 256*1024
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#define SCM_DEFAULT_MIN_YIELD_1 40
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#define SCM_DEFAULT_INIT_HEAP_SIZE_2 32*1024
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/*
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How many cells to collect during one sweep call. This is the pool
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size of each thread.
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*/
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#define DEFAULT_SWEEP_AMOUNT 512
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/* The following value may seem large, but note that if we get to GC at
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* all, this means that we have a numerically intensive application
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*/
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#define SCM_DEFAULT_MIN_YIELD_2 40
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#define SCM_DEFAULT_MAX_SEGMENT_SIZE (20*1024*1024L)
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#define SCM_MIN_HEAP_SEG_SIZE (8 * SCM_GC_SIZEOF_CARD)
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#define SCM_HEAP_SEG_SIZE (16384L * sizeof (scm_t_cell))
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#define SCM_DOUBLECELL_ALIGNED_P(x) (((2 * sizeof (scm_t_cell) - 1) & SCM_UNPACK (x)) == 0)
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#define SCM_GC_CARD_BVEC_SIZE_IN_LONGS \
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((SCM_GC_CARD_N_CELLS + SCM_C_BVEC_LONG_BITS - 1) / SCM_C_BVEC_LONG_BITS)
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#define SCM_GC_IN_CARD_HEADERP(x) \
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(scm_t_cell *) (x) < SCM_GC_CELL_CARD (x) + SCM_GC_CARD_N_HEADER_CELLS
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int scm_getenv_int (const char *var, int def);
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typedef enum { return_on_error, abort_on_error } policy_on_error;
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#define SCM_MAX(A, B) ((A) > (B) ? (A) : (B))
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#define SCM_MIN(A, B) ((A) < (B) ? (A) : (B))
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/* CELL_P checks a random word whether it has the right form for a
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pointer to a cell. Use scm_i_find_heap_segment_containing_object
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to find out whether it actually points to a real cell.
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The right form for a cell pointer is this: the low three bits must
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be scm_tc3_cons, and when the scm_tc3_cons tag is stripped, the
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resulting pointer must be correctly aligned.
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scm_i_initialize_heap_segment_data guarantees that the test below
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works.
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*/
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#define CELL_P(x) ((SCM_UNPACK(x) & (sizeof(scm_t_cell)-1)) == scm_tc3_cons)
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/*
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gc-mark
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*/
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/* this can be used to ensure that set/clear gc marks only happen when
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allowed. */
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int scm_i_marking;
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void scm_mark_all (void);
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extern long int scm_i_deprecated_memory_return;
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extern long int scm_i_find_heap_calls;
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SCM_INTERNAL char const *scm_i_tag_name (scm_t_bits tag); /* MOVEME */
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/*
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global init funcs.
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*/
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void scm_gc_init_malloc (void);
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void scm_gc_init_freelist (void);
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void scm_gc_init_segments (void);
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void scm_gc_init_mark (void);
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#endif
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