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-rw-r--r--gc/reclaim.c739
1 files changed, 739 insertions, 0 deletions
diff --git a/gc/reclaim.c b/gc/reclaim.c
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+++ b/gc/reclaim.c
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+/*
+ * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
+ * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ */
+/* Boehm, February 15, 1996 2:41 pm PST */
+
+#include <stdio.h>
+#include "gc_priv.h"
+
+signed_word GC_mem_found = 0;
+ /* Number of words of memory reclaimed */
+
+static void report_leak(p, sz)
+ptr_t p;
+word sz;
+{
+ if (HDR(p) -> hb_obj_kind == PTRFREE) {
+ GC_err_printf0("Leaked atomic object at ");
+ } else {
+ GC_err_printf0("Leaked composite object at ");
+ }
+ if (GC_debugging_started && GC_has_debug_info(p)) {
+ GC_print_obj(p);
+ } else {
+ GC_err_printf2("0x%lx (appr. size = %ld)\n",
+ (unsigned long)p,
+ (unsigned long)WORDS_TO_BYTES(sz));
+ }
+}
+
+# define FOUND_FREE(hblk, word_no) \
+ { \
+ report_leak((ptr_t)hblk + WORDS_TO_BYTES(word_no), \
+ HDR(hblk) -> hb_sz); \
+ }
+
+/*
+ * reclaim phase
+ *
+ */
+
+
+/*
+ * Test whether a block is completely empty, i.e. contains no marked
+ * objects. This does not require the block to be in physical
+ * memory.
+ */
+
+GC_bool GC_block_empty(hhdr)
+register hdr * hhdr;
+{
+ register word *p = (word *)(&(hhdr -> hb_marks[0]));
+ register word * plim =
+ (word *)(&(hhdr -> hb_marks[MARK_BITS_SZ]));
+ while (p < plim) {
+ if (*p++) return(FALSE);
+ }
+ return(TRUE);
+}
+
+# ifdef GATHERSTATS
+# define INCR_WORDS(sz) n_words_found += (sz)
+# else
+# define INCR_WORDS(sz)
+# endif
+/*
+ * Restore unmarked small objects in h of size sz to the object
+ * free list. Returns the new list.
+ * Clears unmarked objects.
+ */
+/*ARGSUSED*/
+ptr_t GC_reclaim_clear(hbp, hhdr, sz, list)
+register struct hblk *hbp; /* ptr to current heap block */
+register hdr * hhdr;
+register ptr_t list;
+register word sz;
+{
+ register int word_no;
+ register word *p, *q, *plim;
+# ifdef GATHERSTATS
+ register int n_words_found = 0;
+# endif
+
+ p = (word *)(hbp->hb_body);
+ word_no = HDR_WORDS;
+ plim = (word *)((((word)hbp) + HBLKSIZE)
+ - WORDS_TO_BYTES(sz));
+
+ /* go through all words in block */
+ while( p <= plim ) {
+ if( mark_bit_from_hdr(hhdr, word_no) ) {
+ p += sz;
+ } else {
+ INCR_WORDS(sz);
+ /* object is available - put on list */
+ obj_link(p) = list;
+ list = ((ptr_t)p);
+ /* Clear object, advance p to next object in the process */
+ q = p + sz;
+ p++; /* Skip link field */
+ while (p < q) {
+ *p++ = 0;
+ }
+ }
+ word_no += sz;
+ }
+# ifdef GATHERSTATS
+ GC_mem_found += n_words_found;
+# endif
+ return(list);
+}
+
+#ifndef SMALL_CONFIG
+
+/*
+ * A special case for 2 word composite objects (e.g. cons cells):
+ */
+/*ARGSUSED*/
+ptr_t GC_reclaim_clear2(hbp, hhdr, list)
+register struct hblk *hbp; /* ptr to current heap block */
+hdr * hhdr;
+register ptr_t list;
+{
+ register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
+ register word *p, *plim;
+# ifdef GATHERSTATS
+ register int n_words_found = 0;
+# endif
+ register word mark_word;
+ register int i;
+# define DO_OBJ(start_displ) \
+ if (!(mark_word & ((word)1 << start_displ))) { \
+ p[start_displ] = (word)list; \
+ list = (ptr_t)(p+start_displ); \
+ p[start_displ+1] = 0; \
+ INCR_WORDS(2); \
+ }
+
+ p = (word *)(hbp->hb_body);
+ plim = (word *)(((word)hbp) + HBLKSIZE);
+
+ /* go through all words in block */
+ while( p < plim ) {
+ mark_word = *mark_word_addr++;
+ for (i = 0; i < WORDSZ; i += 8) {
+ DO_OBJ(0);
+ DO_OBJ(2);
+ DO_OBJ(4);
+ DO_OBJ(6);
+ p += 8;
+ mark_word >>= 8;
+ }
+ }
+# ifdef GATHERSTATS
+ GC_mem_found += n_words_found;
+# endif
+ return(list);
+# undef DO_OBJ
+}
+
+/*
+ * Another special case for 4 word composite objects:
+ */
+/*ARGSUSED*/
+ptr_t GC_reclaim_clear4(hbp, hhdr, list)
+register struct hblk *hbp; /* ptr to current heap block */
+hdr * hhdr;
+register ptr_t list;
+{
+ register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
+ register word *p, *plim;
+# ifdef GATHERSTATS
+ register int n_words_found = 0;
+# endif
+ register word mark_word;
+# define DO_OBJ(start_displ) \
+ if (!(mark_word & ((word)1 << start_displ))) { \
+ p[start_displ] = (word)list; \
+ list = (ptr_t)(p+start_displ); \
+ p[start_displ+1] = 0; \
+ p[start_displ+2] = 0; \
+ p[start_displ+3] = 0; \
+ INCR_WORDS(4); \
+ }
+
+ p = (word *)(hbp->hb_body);
+ plim = (word *)(((word)hbp) + HBLKSIZE);
+
+ /* go through all words in block */
+ while( p < plim ) {
+ mark_word = *mark_word_addr++;
+ DO_OBJ(0);
+ DO_OBJ(4);
+ DO_OBJ(8);
+ DO_OBJ(12);
+ DO_OBJ(16);
+ DO_OBJ(20);
+ DO_OBJ(24);
+ DO_OBJ(28);
+# if CPP_WORDSZ == 64
+ DO_OBJ(32);
+ DO_OBJ(36);
+ DO_OBJ(40);
+ DO_OBJ(44);
+ DO_OBJ(48);
+ DO_OBJ(52);
+ DO_OBJ(56);
+ DO_OBJ(60);
+# endif
+ p += WORDSZ;
+ }
+# ifdef GATHERSTATS
+ GC_mem_found += n_words_found;
+# endif
+ return(list);
+# undef DO_OBJ
+}
+
+#endif /* !SMALL_CONFIG */
+
+/* The same thing, but don't clear objects: */
+/*ARGSUSED*/
+ptr_t GC_reclaim_uninit(hbp, hhdr, sz, list)
+register struct hblk *hbp; /* ptr to current heap block */
+register hdr * hhdr;
+register ptr_t list;
+register word sz;
+{
+ register int word_no;
+ register word *p, *plim;
+# ifdef GATHERSTATS
+ register int n_words_found = 0;
+# endif
+
+ p = (word *)(hbp->hb_body);
+ word_no = HDR_WORDS;
+ plim = (word *)((((word)hbp) + HBLKSIZE)
+ - WORDS_TO_BYTES(sz));
+
+ /* go through all words in block */
+ while( p <= plim ) {
+ if( !mark_bit_from_hdr(hhdr, word_no) ) {
+ INCR_WORDS(sz);
+ /* object is available - put on list */
+ obj_link(p) = list;
+ list = ((ptr_t)p);
+ }
+ p += sz;
+ word_no += sz;
+ }
+# ifdef GATHERSTATS
+ GC_mem_found += n_words_found;
+# endif
+ return(list);
+}
+
+/* Don't really reclaim objects, just check for unmarked ones: */
+/*ARGSUSED*/
+void GC_reclaim_check(hbp, hhdr, sz)
+register struct hblk *hbp; /* ptr to current heap block */
+register hdr * hhdr;
+register word sz;
+{
+ register int word_no;
+ register word *p, *plim;
+# ifdef GATHERSTATS
+ register int n_words_found = 0;
+# endif
+
+ p = (word *)(hbp->hb_body);
+ word_no = HDR_WORDS;
+ plim = (word *)((((word)hbp) + HBLKSIZE)
+ - WORDS_TO_BYTES(sz));
+
+ /* go through all words in block */
+ while( p <= plim ) {
+ if( !mark_bit_from_hdr(hhdr, word_no) ) {
+ FOUND_FREE(hbp, word_no);
+ }
+ p += sz;
+ word_no += sz;
+ }
+}
+
+#ifndef SMALL_CONFIG
+/*
+ * Another special case for 2 word atomic objects:
+ */
+/*ARGSUSED*/
+ptr_t GC_reclaim_uninit2(hbp, hhdr, list)
+register struct hblk *hbp; /* ptr to current heap block */
+hdr * hhdr;
+register ptr_t list;
+{
+ register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
+ register word *p, *plim;
+# ifdef GATHERSTATS
+ register int n_words_found = 0;
+# endif
+ register word mark_word;
+ register int i;
+# define DO_OBJ(start_displ) \
+ if (!(mark_word & ((word)1 << start_displ))) { \
+ p[start_displ] = (word)list; \
+ list = (ptr_t)(p+start_displ); \
+ INCR_WORDS(2); \
+ }
+
+ p = (word *)(hbp->hb_body);
+ plim = (word *)(((word)hbp) + HBLKSIZE);
+
+ /* go through all words in block */
+ while( p < plim ) {
+ mark_word = *mark_word_addr++;
+ for (i = 0; i < WORDSZ; i += 8) {
+ DO_OBJ(0);
+ DO_OBJ(2);
+ DO_OBJ(4);
+ DO_OBJ(6);
+ p += 8;
+ mark_word >>= 8;
+ }
+ }
+# ifdef GATHERSTATS
+ GC_mem_found += n_words_found;
+# endif
+ return(list);
+# undef DO_OBJ
+}
+
+/*
+ * Another special case for 4 word atomic objects:
+ */
+/*ARGSUSED*/
+ptr_t GC_reclaim_uninit4(hbp, hhdr, list)
+register struct hblk *hbp; /* ptr to current heap block */
+hdr * hhdr;
+register ptr_t list;
+{
+ register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
+ register word *p, *plim;
+# ifdef GATHERSTATS
+ register int n_words_found = 0;
+# endif
+ register word mark_word;
+# define DO_OBJ(start_displ) \
+ if (!(mark_word & ((word)1 << start_displ))) { \
+ p[start_displ] = (word)list; \
+ list = (ptr_t)(p+start_displ); \
+ INCR_WORDS(4); \
+ }
+
+ p = (word *)(hbp->hb_body);
+ plim = (word *)(((word)hbp) + HBLKSIZE);
+
+ /* go through all words in block */
+ while( p < plim ) {
+ mark_word = *mark_word_addr++;
+ DO_OBJ(0);
+ DO_OBJ(4);
+ DO_OBJ(8);
+ DO_OBJ(12);
+ DO_OBJ(16);
+ DO_OBJ(20);
+ DO_OBJ(24);
+ DO_OBJ(28);
+# if CPP_WORDSZ == 64
+ DO_OBJ(32);
+ DO_OBJ(36);
+ DO_OBJ(40);
+ DO_OBJ(44);
+ DO_OBJ(48);
+ DO_OBJ(52);
+ DO_OBJ(56);
+ DO_OBJ(60);
+# endif
+ p += WORDSZ;
+ }
+# ifdef GATHERSTATS
+ GC_mem_found += n_words_found;
+# endif
+ return(list);
+# undef DO_OBJ
+}
+
+/* Finally the one word case, which never requires any clearing: */
+/*ARGSUSED*/
+ptr_t GC_reclaim1(hbp, hhdr, list)
+register struct hblk *hbp; /* ptr to current heap block */
+hdr * hhdr;
+register ptr_t list;
+{
+ register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
+ register word *p, *plim;
+# ifdef GATHERSTATS
+ register int n_words_found = 0;
+# endif
+ register word mark_word;
+ register int i;
+# define DO_OBJ(start_displ) \
+ if (!(mark_word & ((word)1 << start_displ))) { \
+ p[start_displ] = (word)list; \
+ list = (ptr_t)(p+start_displ); \
+ INCR_WORDS(1); \
+ }
+
+ p = (word *)(hbp->hb_body);
+ plim = (word *)(((word)hbp) + HBLKSIZE);
+
+ /* go through all words in block */
+ while( p < plim ) {
+ mark_word = *mark_word_addr++;
+ for (i = 0; i < WORDSZ; i += 4) {
+ DO_OBJ(0);
+ DO_OBJ(1);
+ DO_OBJ(2);
+ DO_OBJ(3);
+ p += 4;
+ mark_word >>= 4;
+ }
+ }
+# ifdef GATHERSTATS
+ GC_mem_found += n_words_found;
+# endif
+ return(list);
+# undef DO_OBJ
+}
+
+#endif /* !SMALL_CONFIG */
+
+/*
+ * Restore unmarked small objects in the block pointed to by hbp
+ * to the appropriate object free list.
+ * If entirely empty blocks are to be completely deallocated, then
+ * caller should perform that check.
+ */
+void GC_reclaim_small_nonempty_block(hbp, report_if_found)
+register struct hblk *hbp; /* ptr to current heap block */
+int report_if_found; /* Abort if a reclaimable object is found */
+{
+ hdr * hhdr;
+ register word sz; /* size of objects in current block */
+ register struct obj_kind * ok;
+ register ptr_t * flh;
+ register int kind;
+
+ hhdr = HDR(hbp);
+ sz = hhdr -> hb_sz;
+ hhdr -> hb_last_reclaimed = (unsigned short) GC_gc_no;
+ kind = hhdr -> hb_obj_kind;
+ ok = &GC_obj_kinds[kind];
+ flh = &(ok -> ok_freelist[sz]);
+ GC_write_hint(hbp);
+
+ if (report_if_found) {
+ GC_reclaim_check(hbp, hhdr, sz);
+ } else if (ok -> ok_init) {
+ switch(sz) {
+# ifndef SMALL_CONFIG
+ case 1:
+ *flh = GC_reclaim1(hbp, hhdr, *flh);
+ break;
+ case 2:
+ *flh = GC_reclaim_clear2(hbp, hhdr, *flh);
+ break;
+ case 4:
+ *flh = GC_reclaim_clear4(hbp, hhdr, *flh);
+ break;
+# endif
+ default:
+ *flh = GC_reclaim_clear(hbp, hhdr, sz, *flh);
+ break;
+ }
+ } else {
+ switch(sz) {
+# ifndef SMALL_CONFIG
+ case 1:
+ *flh = GC_reclaim1(hbp, hhdr, *flh);
+ break;
+ case 2:
+ *flh = GC_reclaim_uninit2(hbp, hhdr, *flh);
+ break;
+ case 4:
+ *flh = GC_reclaim_uninit4(hbp, hhdr, *flh);
+ break;
+# endif
+ default:
+ *flh = GC_reclaim_uninit(hbp, hhdr, sz, *flh);
+ break;
+ }
+ }
+ if (IS_UNCOLLECTABLE(kind)) GC_set_hdr_marks(hhdr);
+}
+
+/*
+ * Restore an unmarked large object or an entirely empty blocks of small objects
+ * to the heap block free list.
+ * Otherwise enqueue the block for later processing
+ * by GC_reclaim_small_nonempty_block.
+ * If report_if_found is TRUE, then process any block immediately, and
+ * simply report free objects; do not actually reclaim them.
+ */
+void GC_reclaim_block(hbp, report_if_found)
+register struct hblk *hbp; /* ptr to current heap block */
+word report_if_found; /* Abort if a reclaimable object is found */
+{
+ register hdr * hhdr;
+ register word sz; /* size of objects in current block */
+ register struct obj_kind * ok;
+ struct hblk ** rlh;
+
+ hhdr = HDR(hbp);
+ sz = hhdr -> hb_sz;
+ ok = &GC_obj_kinds[hhdr -> hb_obj_kind];
+
+ if( sz > MAXOBJSZ ) { /* 1 big object */
+ if( !mark_bit_from_hdr(hhdr, HDR_WORDS) ) {
+ if (report_if_found) {
+ FOUND_FREE(hbp, HDR_WORDS);
+ } else {
+# ifdef GATHERSTATS
+ GC_mem_found += sz;
+# endif
+ GC_freehblk(hbp);
+ }
+ }
+ } else {
+ GC_bool empty = GC_block_empty(hhdr);
+ if (report_if_found) {
+ GC_reclaim_small_nonempty_block(hbp, (int)report_if_found);
+ } else if (empty) {
+# ifdef GATHERSTATS
+ GC_mem_found += BYTES_TO_WORDS(HBLKSIZE);
+# endif
+ GC_freehblk(hbp);
+ } else {
+ /* group of smaller objects, enqueue the real work */
+ rlh = &(ok -> ok_reclaim_list[sz]);
+ hhdr -> hb_next = *rlh;
+ *rlh = hbp;
+ }
+ }
+}
+
+#if !defined(NO_DEBUGGING)
+/* Routines to gather and print heap block info */
+/* intended for debugging. Otherwise should be called */
+/* with lock. */
+static size_t number_of_blocks;
+static size_t total_bytes;
+
+/* Number of set bits in a word. Not performance critical. */
+static int set_bits(n)
+word n;
+{
+ register word m = n;
+ register int result = 0;
+
+ while (m > 0) {
+ if (m & 1) result++;
+ m >>= 1;
+ }
+ return(result);
+}
+
+/* Return the number of set mark bits in the given header */
+int GC_n_set_marks(hhdr)
+hdr * hhdr;
+{
+ register int result = 0;
+ register int i;
+
+ for (i = 0; i < MARK_BITS_SZ; i++) {
+ result += set_bits(hhdr -> hb_marks[i]);
+ }
+ return(result);
+}
+
+/*ARGSUSED*/
+void GC_print_block_descr(h, dummy)
+struct hblk *h;
+word dummy;
+{
+ register hdr * hhdr = HDR(h);
+ register size_t bytes = WORDS_TO_BYTES(hhdr -> hb_sz);
+
+ GC_printf3("(%lu:%lu,%lu)", (unsigned long)(hhdr -> hb_obj_kind),
+ (unsigned long)bytes,
+ (unsigned long)(GC_n_set_marks(hhdr)));
+ bytes += HDR_BYTES + HBLKSIZE-1;
+ bytes &= ~(HBLKSIZE-1);
+ total_bytes += bytes;
+ number_of_blocks++;
+}
+
+void GC_print_block_list()
+{
+ GC_printf0("(kind(0=ptrfree,1=normal,2=unc.,3=stubborn):size_in_bytes, #_marks_set)\n");
+ number_of_blocks = 0;
+ total_bytes = 0;
+ GC_apply_to_all_blocks(GC_print_block_descr, (word)0);
+ GC_printf2("\nblocks = %lu, bytes = %lu\n",
+ (unsigned long)number_of_blocks,
+ (unsigned long)total_bytes);
+}
+
+#endif /* NO_DEBUGGING */
+
+/*
+ * Perform GC_reclaim_block on the entire heap, after first clearing
+ * small object free lists (if we are not just looking for leaks).
+ */
+void GC_start_reclaim(report_if_found)
+int report_if_found; /* Abort if a GC_reclaimable object is found */
+{
+ int kind;
+
+ /* Clear reclaim- and free-lists */
+ for (kind = 0; kind < GC_n_kinds; kind++) {
+ register ptr_t *fop;
+ register ptr_t *lim;
+ register struct hblk ** rlp;
+ register struct hblk ** rlim;
+ register struct hblk ** rlist = GC_obj_kinds[kind].ok_reclaim_list;
+
+ if (rlist == 0) continue; /* This kind not used. */
+ if (!report_if_found) {
+ lim = &(GC_obj_kinds[kind].ok_freelist[MAXOBJSZ+1]);
+ for( fop = GC_obj_kinds[kind].ok_freelist; fop < lim; fop++ ) {
+ *fop = 0;
+ }
+ } /* otherwise free list objects are marked, */
+ /* and its safe to leave them */
+ rlim = rlist + MAXOBJSZ+1;
+ for( rlp = rlist; rlp < rlim; rlp++ ) {
+ *rlp = 0;
+ }
+ }
+
+# ifdef PRINTBLOCKS
+ GC_printf0("GC_reclaim: current block sizes:\n");
+ GC_print_block_list();
+# endif
+
+ /* Go through all heap blocks (in hblklist) and reclaim unmarked objects */
+ /* or enqueue the block for later processing. */
+ GC_apply_to_all_blocks(GC_reclaim_block, (word)report_if_found);
+
+}
+
+/*
+ * Sweep blocks of the indicated object size and kind until either the
+ * appropriate free list is nonempty, or there are no more blocks to
+ * sweep.
+ */
+void GC_continue_reclaim(sz, kind)
+word sz; /* words */
+int kind;
+{
+ register hdr * hhdr;
+ register struct hblk * hbp;
+ register struct obj_kind * ok = &(GC_obj_kinds[kind]);
+ struct hblk ** rlh = ok -> ok_reclaim_list;
+ ptr_t *flh = &(ok -> ok_freelist[sz]);
+
+ if (rlh == 0) return; /* No blocks of this kind. */
+ rlh += sz;
+ while ((hbp = *rlh) != 0) {
+ hhdr = HDR(hbp);
+ *rlh = hhdr -> hb_next;
+ GC_reclaim_small_nonempty_block(hbp, FALSE);
+ if (*flh != 0) break;
+ }
+}
+
+/*
+ * Reclaim all small blocks waiting to be reclaimed.
+ * Abort and return FALSE when/if (*stop_func)() returns TRUE.
+ * If this returns TRUE, then it's safe to restart the world
+ * with incorrectly cleared mark bits.
+ * If ignore_old is TRUE, then reclain only blocks that have been
+ * recently reclaimed, and discard the rest.
+ * Stop_func may be 0.
+ */
+GC_bool GC_reclaim_all(stop_func, ignore_old)
+GC_stop_func stop_func;
+GC_bool ignore_old;
+{
+ register word sz;
+ register int kind;
+ register hdr * hhdr;
+ register struct hblk * hbp;
+ register struct obj_kind * ok;
+ struct hblk ** rlp;
+ struct hblk ** rlh;
+# ifdef PRINTTIMES
+ CLOCK_TYPE start_time;
+ CLOCK_TYPE done_time;
+
+ GET_TIME(start_time);
+# endif
+
+ for (kind = 0; kind < GC_n_kinds; kind++) {
+ ok = &(GC_obj_kinds[kind]);
+ rlp = ok -> ok_reclaim_list;
+ if (rlp == 0) continue;
+ for (sz = 1; sz <= MAXOBJSZ; sz++) {
+ rlh = rlp + sz;
+ while ((hbp = *rlh) != 0) {
+ if (stop_func != (GC_stop_func)0 && (*stop_func)()) {
+ return(FALSE);
+ }
+ hhdr = HDR(hbp);
+ *rlh = hhdr -> hb_next;
+ if (!ignore_old || hhdr -> hb_last_reclaimed == GC_gc_no - 1) {
+ /* It's likely we'll need it this time, too */
+ /* It's been touched recently, so this */
+ /* shouldn't trigger paging. */
+ GC_reclaim_small_nonempty_block(hbp, FALSE);
+ }
+ }
+ }
+ }
+# ifdef PRINTTIMES
+ GET_TIME(done_time);
+ GC_printf1("Disposing of reclaim lists took %lu msecs\n",
+ MS_TIME_DIFF(done_time,start_time));
+# endif
+ return(TRUE);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 21:39:34 +0000