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gcc/boehm-gc/include/private/gc_priv.h
Bryce McKinlay aeb76991de linux_threads.c (GC_init_parallel): Do not declare as a static constructor. 
* linux_threads.c (GC_init_parallel): Do not declare as a static
	constructor.
	* include/gc.h (GC_init): Declare here. Add description.
	* include/private/gc_priv.h (GC_init): Remove declaration.

From-SVN: r46420
2001-10-23 01:28:56 +01:00

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/*
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
* Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
* Copyright (c) 1999-2001 by Hewlett-Packard Company. 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.
*/
# ifndef GC_PRIVATE_H
# define GC_PRIVATE_H
#if defined(mips) && defined(SYSTYPE_BSD) && defined(sony_news)
/* sony RISC NEWS, NEWSOS 4 */
# define BSD_TIME
/* typedef long ptrdiff_t; -- necessary on some really old systems */
#endif
#if defined(mips) && defined(SYSTYPE_BSD43)
/* MIPS RISCOS 4 */
# define BSD_TIME
#endif
#ifdef BSD_TIME
# include <sys/types.h>
# include <sys/time.h>
# include <sys/resource.h>
#endif /* BSD_TIME */
# ifndef GC_H
# include "gc.h"
# endif
# ifndef GC_MARK_H
# include "../gc_mark.h"
# endif
# ifndef GCCONFIG_H
# include "gcconfig.h"
# endif
typedef GC_word word;
typedef GC_signed_word signed_word;
typedef int GC_bool;
# define TRUE 1
# define FALSE 0
typedef char * ptr_t; /* A generic pointer to which we can add */
/* byte displacements. */
/* Preferably identical to caddr_t, if it */
/* exists. */
# ifndef HEADERS_H
# include "gc_hdrs.h"
# endif
#if defined(__STDC__)
# include <stdlib.h>
# if !(defined( sony_news ) )
# include <stddef.h>
# endif
# define VOLATILE volatile
#else
# ifdef MSWIN32
# include <stdlib.h>
# endif
# define VOLATILE
#endif
#if 0 /* defined(__GNUC__) doesn't work yet */
# define EXPECT(expr, outcome) __builtin_expect(expr,outcome)
/* Equivalent to (expr), but predict that usually (expr)==outcome. */
#else
# define EXPECT(expr, outcome) (expr)
#endif /* __GNUC__ */
# ifndef GC_LOCKS_H
# include "gc_locks.h"
# endif
# ifdef STACK_GROWS_DOWN
# define COOLER_THAN >
# define HOTTER_THAN <
# define MAKE_COOLER(x,y) if ((word)(x)+(y) > (word)(x)) {(x) += (y);} \
else {(x) = (word)ONES;}
# define MAKE_HOTTER(x,y) (x) -= (y)
# else
# define COOLER_THAN <
# define HOTTER_THAN >
# define MAKE_COOLER(x,y) if ((word)(x)-(y) < (word)(x)) {(x) -= (y);} else {(x) = 0;}
# define MAKE_HOTTER(x,y) (x) += (y)
# endif
#if defined(AMIGA) && defined(__SASC)
# define GC_FAR __far
#else
# define GC_FAR
#endif
/*********************************/
/* */
/* Definitions for conservative */
/* collector */
/* */
/*********************************/
/*********************************/
/* */
/* Easily changeable parameters */
/* */
/*********************************/
/* #define STUBBORN_ALLOC */
/* Enable stubborm allocation, and thus a limited */
/* form of incremental collection w/o dirty bits. */
/* #define ALL_INTERIOR_POINTERS */
/* Forces all pointers into the interior of an */
/* object to be considered valid. Also causes the */
/* sizes of all objects to be inflated by at least */
/* one byte. This should suffice to guarantee */
/* that in the presence of a compiler that does */
/* not perform garbage-collector-unsafe */
/* optimizations, all portable, strictly ANSI */
/* conforming C programs should be safely usable */
/* with malloc replaced by GC_malloc and free */
/* calls removed. There are several disadvantages: */
/* 1. There are probably no interesting, portable, */
/* strictly ANSI conforming C programs. */
/* 2. This option makes it hard for the collector */
/* to allocate space that is not ``pointed to'' */
/* by integers, etc. Under SunOS 4.X with a */
/* statically linked libc, we empiricaly */
/* observed that it would be difficult to */
/* allocate individual objects larger than 100K. */
/* Even if only smaller objects are allocated, */
/* more swap space is likely to be needed. */
/* Fortunately, much of this will never be */
/* touched. */
/* If you can easily avoid using this option, do. */
/* If not, try to keep individual objects small. */
/* This is now really controlled at startup, */
/* through GC_all_interior_pointers. */
#define PRINTSTATS /* Print garbage collection statistics */
/* For less verbose output, undefine in reclaim.c */
#define PRINTTIMES /* Print the amount of time consumed by each garbage */
/* collection. */
#define PRINTBLOCKS /* Print object sizes associated with heap blocks, */
/* whether the objects are atomic or composite, and */
/* whether or not the block was found to be empty */
/* during the reclaim phase. Typically generates */
/* about one screenful per garbage collection. */
#undef PRINTBLOCKS
#ifdef SILENT
# ifdef PRINTSTATS
# undef PRINTSTATS
# endif
# ifdef PRINTTIMES
# undef PRINTTIMES
# endif
# ifdef PRINTNBLOCKS
# undef PRINTNBLOCKS
# endif
#endif
#if defined(PRINTSTATS) && !defined(GATHERSTATS)
# define GATHERSTATS
#endif
#if defined(PRINTSTATS) || !defined(SMALL_CONFIG)
# define CONDPRINT /* Print some things if GC_print_stats is set */
#endif
#define GC_INVOKE_FINALIZERS() GC_notify_or_invoke_finalizers()
#define MERGE_SIZES /* Round up some object sizes, so that fewer distinct */
/* free lists are actually maintained. This applies */
/* only to the top level routines in misc.c, not to */
/* user generated code that calls GC_allocobj and */
/* GC_allocaobj directly. */
/* Slows down average programs slightly. May however */
/* substantially reduce fragmentation if allocation */
/* request sizes are widely scattered. */
/* May save significant amounts of space for obj_map */
/* entries. */
#if defined(USE_MARK_BYTES) && !defined(ALIGN_DOUBLE)
# define ALIGN_DOUBLE
/* We use one byte for every 2 words, which doesn't allow for */
/* odd numbered words to have mark bits. */
#endif
/* ALIGN_DOUBLE requires MERGE_SIZES at present. */
# if defined(ALIGN_DOUBLE) && !defined(MERGE_SIZES)
# define MERGE_SIZES
# endif
#if !defined(DONT_ADD_BYTE_AT_END)
# define EXTRA_BYTES GC_all_interior_pointers
#else
# define EXTRA_BYTES 0
#endif
# ifndef LARGE_CONFIG
# define MINHINCR 16 /* Minimum heap increment, in blocks of HBLKSIZE */
/* Must be multiple of largest page size. */
# define MAXHINCR 2048 /* Maximum heap increment, in blocks */
# else
# define MINHINCR 64
# define MAXHINCR 4096
# endif
# define TIME_LIMIT 50 /* We try to keep pause times from exceeding */
/* this by much. In milliseconds. */
# define BL_LIMIT GC_black_list_spacing
/* If we need a block of N bytes, and we have */
/* a block of N + BL_LIMIT bytes available, */
/* and N > BL_LIMIT, */
/* but all possible positions in it are */
/* blacklisted, we just use it anyway (and */
/* print a warning, if warnings are enabled). */
/* This risks subsequently leaking the block */
/* due to a false reference. But not using */
/* the block risks unreasonable immediate */
/* heap growth. */
/*********************************/
/* */
/* Stack saving for debugging */
/* */
/*********************************/
#ifdef SAVE_CALL_CHAIN
/*
* Number of frames and arguments to save in objects allocated by
* debugging allocator.
*/
# ifndef SAVE_CALL_COUNT
# define NFRAMES 6 /* Number of frames to save. Even for */
/* alignment reasons. */
# else
# define NFRAMES ((SAVE_CALL_COUNT + 1) & ~1)
# endif
# define NARGS 2 /* Mumber of arguments to save for each call. */
# define NEED_CALLINFO
/* Fill in the pc and argument information for up to NFRAMES of my */
/* callers. Ignore my frame and my callers frame. */
struct callinfo;
void GC_save_callers GC_PROTO((struct callinfo info[NFRAMES]));
void GC_print_callers GC_PROTO((struct callinfo info[NFRAMES]));
#else
# ifdef GC_ADD_CALLER
# define NFRAMES 1
# define NARGS 0
# define NEED_CALLINFO
# endif
#endif
#ifdef NEED_CALLINFO
struct callinfo {
word ci_pc; /* Caller, not callee, pc */
# if NARGS > 0
word ci_arg[NARGS]; /* bit-wise complement to avoid retention */
# endif
# if defined(ALIGN_DOUBLE) && (NFRAMES * (NARGS + 1)) % 2 == 1
/* Likely alignment problem. */
word ci_dummy;
# endif
};
#endif
/*********************************/
/* */
/* OS interface routines */
/* */
/*********************************/
#ifdef BSD_TIME
# undef CLOCK_TYPE
# undef GET_TIME
# undef MS_TIME_DIFF
# define CLOCK_TYPE struct timeval
# define GET_TIME(x) { struct rusage rusage; \
getrusage (RUSAGE_SELF, &rusage); \
x = rusage.ru_utime; }
# define MS_TIME_DIFF(a,b) ((double) (a.tv_sec - b.tv_sec) * 1000.0 \
+ (double) (a.tv_usec - b.tv_usec) / 1000.0)
#else /* !BSD_TIME */
# if defined(MSWIN32) || defined(MSWINCE)
# include <windows.h>
# include <winbase.h>
# define CLOCK_TYPE DWORD
# define GET_TIME(x) x = GetTickCount()
# define MS_TIME_DIFF(a,b) ((long)((a)-(b)))
# else /* !MSWIN32, !MSWINCE, !BSD_TIME */
# include <time.h>
# if !defined(__STDC__) && defined(SPARC) && defined(SUNOS4)
clock_t clock(); /* Not in time.h, where it belongs */
# endif
# if defined(FREEBSD) && !defined(CLOCKS_PER_SEC)
# include <machine/limits.h>
# define CLOCKS_PER_SEC CLK_TCK
# endif
# if !defined(CLOCKS_PER_SEC)
# define CLOCKS_PER_SEC 1000000
/*
* This is technically a bug in the implementation. ANSI requires that
* CLOCKS_PER_SEC be defined. But at least under SunOS4.1.1, it isn't.
* Also note that the combination of ANSI C and POSIX is incredibly gross
* here. The type clock_t is used by both clock() and times(). But on
* some machines these use different notions of a clock tick, CLOCKS_PER_SEC
* seems to apply only to clock. Hence we use it here. On many machines,
* including SunOS, clock actually uses units of microseconds (which are
* not really clock ticks).
*/
# endif
# define CLOCK_TYPE clock_t
# define GET_TIME(x) x = clock()
# define MS_TIME_DIFF(a,b) ((unsigned long) \
(1000.0*(double)((a)-(b))/(double)CLOCKS_PER_SEC))
# endif /* !MSWIN32 */
#endif /* !BSD_TIME */
/* We use bzero and bcopy internally. They may not be available. */
# if defined(SPARC) && defined(SUNOS4)
# define BCOPY_EXISTS
# endif
# if defined(M68K) && defined(AMIGA)
# define BCOPY_EXISTS
# endif
# if defined(M68K) && defined(NEXT)
# define BCOPY_EXISTS
# endif
# if defined(VAX)
# define BCOPY_EXISTS
# endif
# if defined(AMIGA)
# include <string.h>
# define BCOPY_EXISTS
# endif
# if defined(MACOSX)
# define BCOPY_EXISTS
# endif
# ifndef BCOPY_EXISTS
# include <string.h>
# define BCOPY(x,y,n) memcpy(y, x, (size_t)(n))
# define BZERO(x,n) memset(x, 0, (size_t)(n))
# else
# define BCOPY(x,y,n) bcopy((char *)(x),(char *)(y),(int)(n))
# define BZERO(x,n) bzero((char *)(x),(int)(n))
# endif
/* HBLKSIZE aligned allocation. 0 is taken to mean failure */
/* space is assumed to be cleared. */
/* In the case os USE_MMAP, the argument must also be a */
/* physical page size. */
/* GET_MEM is currently not assumed to retrieve 0 filled space, */
/* though we should perhaps take advantage of the case in which */
/* does. */
struct hblk; /* See below. */
# ifdef PCR
char * real_malloc();
# define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)bytes + GC_page_size) \
+ GC_page_size-1)
# else
# ifdef OS2
void * os2_alloc(size_t bytes);
# define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)bytes \
+ GC_page_size) \
+ GC_page_size-1)
# else
# if defined(NEXT) || defined(MACOSX) || defined(DOS4GW) || \
(defined(AMIGA) && !defined(GC_AMIGA_FASTALLOC))
# define GET_MEM(bytes) HBLKPTR((size_t) \
calloc(1, (size_t)bytes + GC_page_size) \
+ GC_page_size-1)
# else
# ifdef MSWIN32
extern ptr_t GC_win32_get_mem();
# define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes)
# else
# ifdef MACOS
# if defined(USE_TEMPORARY_MEMORY)
extern Ptr GC_MacTemporaryNewPtr(size_t size,
Boolean clearMemory);
# define GET_MEM(bytes) HBLKPTR( \
GC_MacTemporaryNewPtr(bytes + GC_page_size, true) \
+ GC_page_size-1)
# else
# define GET_MEM(bytes) HBLKPTR( \
NewPtrClear(bytes + GC_page_size) + GC_page_size-1)
# endif
# else
# ifdef MSWINCE
extern ptr_t GC_wince_get_mem();
# define GET_MEM(bytes) (struct hblk *)GC_wince_get_mem(bytes)
# else
# if defined(AMIGA) && defined(GC_AMIGA_FASTALLOC)
extern void *GC_amiga_get_mem(size_t size);
define GET_MEM(bytes) HBLKPTR((size_t) \
GC_amiga_get_mem((size_t)bytes + GC_page_size) \
+ GC_page_size-1)
# else
extern ptr_t GC_unix_get_mem();
# define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes)
# endif
# endif
# endif
# endif
# endif
# endif
# endif
/* Delay any interrupts or signals that may abort this thread. Data */
/* structures are in a consistent state outside this pair of calls. */
/* ANSI C allows both to be empty (though the standard isn't very */
/* clear on that point). Standard malloc implementations are usually */
/* neither interruptable nor thread-safe, and thus correspond to */
/* empty definitions. */
/* It probably doesn't make any sense to declare these to be nonempty */
/* if the code is being optimized, since signal safety relies on some */
/* ordering constraints that are typically not obeyed by optimizing */
/* compilers. */
# ifdef PCR
# define DISABLE_SIGNALS() \
PCR_Th_SetSigMask(PCR_allSigsBlocked,&GC_old_sig_mask)
# define ENABLE_SIGNALS() \
PCR_Th_SetSigMask(&GC_old_sig_mask, NIL)
# else
# if defined(THREADS) || defined(AMIGA) \
|| defined(MSWIN32) || defined(MSWINCE) || defined(MACOS) \
|| defined(DJGPP) || defined(NO_SIGNALS)
/* Also useful for debugging. */
/* Should probably use thr_sigsetmask for GC_SOLARIS_THREADS. */
# define DISABLE_SIGNALS()
# define ENABLE_SIGNALS()
# else
# define DISABLE_SIGNALS() GC_disable_signals()
void GC_disable_signals();
# define ENABLE_SIGNALS() GC_enable_signals()
void GC_enable_signals();
# endif
# endif
/*
* Stop and restart mutator threads.
*/
# ifdef PCR
# include "th/PCR_ThCtl.h"
# define STOP_WORLD() \
PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_stopNormal, \
PCR_allSigsBlocked, \
PCR_waitForever)
# define START_WORLD() \
PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_null, \
PCR_allSigsBlocked, \
PCR_waitForever);
# else
# if defined(GC_SOLARIS_THREADS) || defined(GC_WIN32_THREADS) \
|| defined(GC_PTHREADS)
void GC_stop_world();
void GC_start_world();
# define STOP_WORLD() GC_stop_world()
# define START_WORLD() GC_start_world()
# else
# define STOP_WORLD()
# define START_WORLD()
# endif
# endif
/* Abandon ship */
# ifdef PCR
# define ABORT(s) PCR_Base_Panic(s)
# else
# ifdef SMALL_CONFIG
# define ABORT(msg) abort();
# else
GC_API void GC_abort();
# define ABORT(msg) GC_abort(msg);
# endif
# endif
/* Exit abnormally, but without making a mess (e.g. out of memory) */
# ifdef PCR
# define EXIT() PCR_Base_Exit(1,PCR_waitForever)
# else
# define EXIT() (void)exit(1)
# endif
/* Print warning message, e.g. almost out of memory. */
# define WARN(msg,arg) (*GC_current_warn_proc)(msg, (GC_word)(arg))
extern GC_warn_proc GC_current_warn_proc;
/* Get environment entry */
#if !defined(NO_GETENV)
# define GETENV(name) getenv(name)
#else
# define GETENV(name) 0
#endif
/*********************************/
/* */
/* Word-size-dependent defines */
/* */
/*********************************/
#if CPP_WORDSZ == 32
# define WORDS_TO_BYTES(x) ((x)<<2)
# define BYTES_TO_WORDS(x) ((x)>>2)
# define LOGWL ((word)5) /* log[2] of CPP_WORDSZ */
# define modWORDSZ(n) ((n) & 0x1f) /* n mod size of word */
# if ALIGNMENT != 4
# define UNALIGNED
# endif
#endif
#if CPP_WORDSZ == 64
# define WORDS_TO_BYTES(x) ((x)<<3)
# define BYTES_TO_WORDS(x) ((x)>>3)
# define LOGWL ((word)6) /* log[2] of CPP_WORDSZ */
# define modWORDSZ(n) ((n) & 0x3f) /* n mod size of word */
# if ALIGNMENT != 8
# define UNALIGNED
# endif
#endif
#define WORDSZ ((word)CPP_WORDSZ)
#define SIGNB ((word)1 << (WORDSZ-1))
#define BYTES_PER_WORD ((word)(sizeof (word)))
#define ONES ((word)(signed_word)(-1))
#define divWORDSZ(n) ((n) >> LOGWL) /* divide n by size of word */
/*********************/
/* */
/* Size Parameters */
/* */
/*********************/
/* heap block size, bytes. Should be power of 2 */
#ifndef HBLKSIZE
# ifdef SMALL_CONFIG
# define CPP_LOG_HBLKSIZE 10
# else
# if (CPP_WORDSZ == 32) || (defined(HPUX) && defined(HP_PA))
/* HPUX/PA seems to use 4K pages with the 64 bit ABI */
# define CPP_LOG_HBLKSIZE 12
# else
# define CPP_LOG_HBLKSIZE 13
# endif
# endif
#else
# if HBLKSIZE == 512
# define CPP_LOG_HBLKSIZE 9
# endif
# if HBLKSIZE == 1024
# define CPP_LOG_HBLKSIZE 10
# endif
# if HBLKSIZE == 2048
# define CPP_LOG_HBLKSIZE 11
# endif
# if HBLKSIZE == 4096
# define CPP_LOG_HBLKSIZE 12
# endif
# if HBLKSIZE == 8192
# define CPP_LOG_HBLKSIZE 13
# endif
# if HBLKSIZE == 16384
# define CPP_LOG_HBLKSIZE 14
# endif
# ifndef CPP_LOG_HBLKSIZE
--> fix HBLKSIZE
# endif
# undef HBLKSIZE
#endif
# define CPP_HBLKSIZE (1 << CPP_LOG_HBLKSIZE)
# define LOG_HBLKSIZE ((word)CPP_LOG_HBLKSIZE)
# define HBLKSIZE ((word)CPP_HBLKSIZE)
/* max size objects supported by freelist (larger objects may be */
/* allocated, but less efficiently) */
#define CPP_MAXOBJBYTES (CPP_HBLKSIZE/2)
#define MAXOBJBYTES ((word)CPP_MAXOBJBYTES)
#define CPP_MAXOBJSZ BYTES_TO_WORDS(CPP_HBLKSIZE/2)
#define MAXOBJSZ ((word)CPP_MAXOBJSZ)
# define divHBLKSZ(n) ((n) >> LOG_HBLKSIZE)
# define HBLK_PTR_DIFF(p,q) divHBLKSZ((ptr_t)p - (ptr_t)q)
/* Equivalent to subtracting 2 hblk pointers. */
/* We do it this way because a compiler should */
/* find it hard to use an integer division */
/* instead of a shift. The bundled SunOS 4.1 */
/* o.w. sometimes pessimizes the subtraction to */
/* involve a call to .div. */
# define modHBLKSZ(n) ((n) & (HBLKSIZE-1))
# define HBLKPTR(objptr) ((struct hblk *)(((word) (objptr)) & ~(HBLKSIZE-1)))
# define HBLKDISPL(objptr) (((word) (objptr)) & (HBLKSIZE-1))
/* Round up byte allocation requests to integral number of words, etc. */
# define ROUNDED_UP_WORDS(n) \
BYTES_TO_WORDS((n) + (WORDS_TO_BYTES(1) - 1 + EXTRA_BYTES))
# ifdef ALIGN_DOUBLE
# define ALIGNED_WORDS(n) \
(BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2) - 1 + EXTRA_BYTES) & ~1)
# else
# define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n)
# endif
# define SMALL_OBJ(bytes) ((bytes) < (MAXOBJBYTES - EXTRA_BYTES))
# define ADD_SLOP(bytes) ((bytes) + EXTRA_BYTES)
# ifndef MIN_WORDS
/* MIN_WORDS is the size of the smallest allocated object. */
/* 1 and 2 are the only valid values. */
/* 2 must be used if: */
/* - GC_gcj_malloc can be used for objects of requested */
/* size smaller than 2 words, or */
/* - USE_MARK_BYTES is defined. */
# if defined(USE_MARK_BYTES) || defined(GC_GCJ_SUPPORT)
# define MIN_WORDS 2 /* Smallest allocated object. */
# else
# define MIN_WORDS 1
# endif
# endif
/*
* Hash table representation of sets of pages. This assumes it is
* OK to add spurious entries to sets.
* Used by black-listing code, and perhaps by dirty bit maintenance code.
*/
# ifdef LARGE_CONFIG
# define LOG_PHT_ENTRIES 19 /* Collisions likely at 512K blocks, */
/* which is >= 2GB. Each table takes */
/* 64KB. */
# else
# ifdef SMALL_CONFIG
# define LOG_PHT_ENTRIES 14 /* Collisions are likely if heap grows */
/* to more than 16K hblks = 64MB. */
/* Each hash table occupies 2K bytes. */
# else /* default "medium" configuration */
# define LOG_PHT_ENTRIES 16 /* Collisions are likely if heap grows */
/* to more than 16K hblks >= 256MB. */
/* Each hash table occupies 8K bytes. */
# endif
# endif
# define PHT_ENTRIES ((word)1 << LOG_PHT_ENTRIES)
# define PHT_SIZE (PHT_ENTRIES >> LOGWL)
typedef word page_hash_table[PHT_SIZE];
# define PHT_HASH(addr) ((((word)(addr)) >> LOG_HBLKSIZE) & (PHT_ENTRIES - 1))
# define get_pht_entry_from_index(bl, index) \
(((bl)[divWORDSZ(index)] >> modWORDSZ(index)) & 1)
# define set_pht_entry_from_index(bl, index) \
(bl)[divWORDSZ(index)] |= (word)1 << modWORDSZ(index)
# define clear_pht_entry_from_index(bl, index) \
(bl)[divWORDSZ(index)] &= ~((word)1 << modWORDSZ(index))
/* And a dumb but thread-safe version of set_pht_entry_from_index. */
/* This sets (many) extra bits. */
# define set_pht_entry_from_index_safe(bl, index) \
(bl)[divWORDSZ(index)] = ONES
/********************************************/
/* */
/* H e a p B l o c k s */
/* */
/********************************************/
/* heap block header */
#define HBLKMASK (HBLKSIZE-1)
#define BITS_PER_HBLK (CPP_HBLKSIZE * 8)
#define MARK_BITS_PER_HBLK (BITS_PER_HBLK/CPP_WORDSZ)
/* upper bound */
/* We allocate 1 bit/word, unless USE_MARK_BYTES */
/* is defined. Only the first word */
/* in each object is actually marked. */
# ifdef USE_MARK_BYTES
# define MARK_BITS_SZ (MARK_BITS_PER_HBLK/2)
/* Unlike the other case, this is in units of bytes. */
/* We actually allocate only every second mark bit, since we */
/* force all objects to be doubleword aligned. */
/* However, each mark bit is allocated as a byte. */
# else
# define MARK_BITS_SZ (MARK_BITS_PER_HBLK/CPP_WORDSZ)
# endif
/* We maintain layout maps for heap blocks containing objects of a given */
/* size. Each entry in this map describes a byte offset and has the */
/* following type. */
typedef unsigned char map_entry_type;
struct hblkhdr {
word hb_sz; /* If in use, size in words, of objects in the block. */
/* if free, the size in bytes of the whole block */
struct hblk * hb_next; /* Link field for hblk free list */
/* and for lists of chunks waiting to be */
/* reclaimed. */
struct hblk * hb_prev; /* Backwards link for free list. */
word hb_descr; /* object descriptor for marking. See */
/* mark.h. */
map_entry_type * hb_map;
/* A pointer to a pointer validity map of the block. */
/* See GC_obj_map. */
/* Valid for all blocks with headers. */
/* Free blocks point to GC_invalid_map. */
unsigned char hb_obj_kind;
/* Kind of objects in the block. Each kind */
/* identifies a mark procedure and a set of */
/* list headers. Sometimes called regions. */
unsigned char hb_flags;
# define IGNORE_OFF_PAGE 1 /* Ignore pointers that do not */
/* point to the first page of */
/* this object. */
# define WAS_UNMAPPED 2 /* This is a free block, which has */
/* been unmapped from the address */
/* space. */
/* GC_remap must be invoked on it */
/* before it can be reallocated. */
/* Only set with USE_MUNMAP. */
unsigned short hb_last_reclaimed;
/* Value of GC_gc_no when block was */
/* last allocated or swept. May wrap. */
/* For a free block, this is maintained */
/* only for USE_MUNMAP, and indicates */
/* when the header was allocated, or */
/* when the size of the block last */
/* changed. */
# ifdef USE_MARK_BYTES
union {
char _hb_marks[MARK_BITS_SZ];
/* The i'th byte is 1 if the object */
/* starting at word 2i is marked, 0 o.w. */
word dummy; /* Force word alignment of mark bytes. */
} _mark_byte_union;
# define hb_marks _mark_byte_union._hb_marks
# else
word hb_marks[MARK_BITS_SZ];
/* Bit i in the array refers to the */
/* object starting at the ith word (header */
/* INCLUDED) in the heap block. */
/* The lsb of word 0 is numbered 0. */
/* Unused bits are invalid, and are */
/* occasionally set, e.g for uncollectable */
/* objects. */
# endif /* !USE_MARK_BYTES */
};
/* heap block body */
# define BODY_SZ (HBLKSIZE/sizeof(word))
struct hblk {
# if 0 /* DISCARDWORDS no longer supported */
word garbage[DISCARD_WORDS];
# endif
word hb_body[BODY_SZ];
};
# define OBJ_SZ_TO_BLOCKS(sz) \
divHBLKSZ(WORDS_TO_BYTES(sz) + HBLKSIZE-1)
/* Size of block (in units of HBLKSIZE) needed to hold objects of */
/* given sz (in words). */
/* Object free list link */
# define obj_link(p) (*(ptr_t *)(p))
# define LOG_MAX_MARK_PROCS 6
# define MAX_MARK_PROCS (1 << LOG_MAX_MARK_PROCS)
/* Root sets. Logically private to mark_rts.c. But we don't want the */
/* tables scanned, so we put them here. */
/* MAX_ROOT_SETS is the maximum number of ranges that can be */
/* registered as static roots. */
# ifdef LARGE_CONFIG
# define MAX_ROOT_SETS 4096
# else
# ifdef PCR
# define MAX_ROOT_SETS 1024
# else
# if defined(MSWIN32) || defined(MSWINCE)
# define MAX_ROOT_SETS 1024
/* Under NT, we add only written pages, which can result */
/* in many small root sets. */
# else
# define MAX_ROOT_SETS 256
# endif
# endif
# endif
# define MAX_EXCLUSIONS (MAX_ROOT_SETS/4)
/* Maximum number of segments that can be excluded from root sets. */
/*
* Data structure for excluded static roots.
*/
struct exclusion {
ptr_t e_start;
ptr_t e_end;
};
/* Data structure for list of root sets. */
/* We keep a hash table, so that we can filter out duplicate additions. */
/* Under Win32, we need to do a better job of filtering overlaps, so */
/* we resort to sequential search, and pay the price. */
struct roots {
ptr_t r_start;
ptr_t r_end;
# if !defined(MSWIN32) && !defined(MSWINCE)
struct roots * r_next;
# endif
GC_bool r_tmp;
/* Delete before registering new dynamic libraries */
};
#if !defined(MSWIN32) && !defined(MSWINCE)
/* Size of hash table index to roots. */
# define LOG_RT_SIZE 6
# define RT_SIZE (1 << LOG_RT_SIZE) /* Power of 2, may be != MAX_ROOT_SETS */
#endif
/* Lists of all heap blocks and free lists */
/* as well as other random data structures */
/* that should not be scanned by the */
/* collector. */
/* These are grouped together in a struct */
/* so that they can be easily skipped by the */
/* GC_mark routine. */
/* The ordering is weird to make GC_malloc */
/* faster by keeping the important fields */
/* sufficiently close together that a */
/* single load of a base register will do. */
/* Scalars that could easily appear to */
/* be pointers are also put here. */
/* The main fields should precede any */
/* conditionally included fields, so that */
/* gc_inl.h will work even if a different set */
/* of macros is defined when the client is */
/* compiled. */
struct _GC_arrays {
word _heapsize;
word _max_heapsize;
word _requested_heapsize; /* Heap size due to explicit expansion */
ptr_t _last_heap_addr;
ptr_t _prev_heap_addr;
word _large_free_bytes;
/* Total bytes contained in blocks on large object free */
/* list. */
word _large_allocd_bytes;
/* Total number of bytes in allocated large objects blocks. */
/* For the purposes of this counter and the next one only, a */
/* large object is one that occupies a block of at least */
/* 2*HBLKSIZE. */
word _max_large_allocd_bytes;
/* Maximum number of bytes that were ever allocated in */
/* large object blocks. This is used to help decide when it */
/* is safe to split up a large block. */
word _words_allocd_before_gc;
/* Number of words allocated before this */
/* collection cycle. */
# ifndef SEPARATE_GLOBALS
word _words_allocd;
/* Number of words allocated during this collection cycle */
# endif
word _words_wasted;
/* Number of words wasted due to internal fragmentation */
/* in large objects, or due to dropping blacklisted */
/* blocks, since last gc. Approximate. */
word _words_finalized;
/* Approximate number of words in objects (and headers) */
/* That became ready for finalization in the last */
/* collection. */
word _non_gc_bytes_at_gc;
/* Number of explicitly managed bytes of storage */
/* at last collection. */
word _mem_freed;
/* Number of explicitly deallocated words of memory */
/* since last collection. */
ptr_t _scratch_end_ptr;
ptr_t _scratch_last_end_ptr;
/* Used by headers.c, and can easily appear to point to */
/* heap. */
GC_mark_proc _mark_procs[MAX_MARK_PROCS];
/* Table of user-defined mark procedures. There is */
/* a small number of these, which can be referenced */
/* by DS_PROC mark descriptors. See gc_mark.h. */
# ifndef SEPARATE_GLOBALS
ptr_t _objfreelist[MAXOBJSZ+1];
/* free list for objects */
ptr_t _aobjfreelist[MAXOBJSZ+1];
/* free list for atomic objs */
# endif
ptr_t _uobjfreelist[MAXOBJSZ+1];
/* uncollectable but traced objs */
/* objects on this and auobjfreelist */
/* are always marked, except during */
/* garbage collections. */
# ifdef ATOMIC_UNCOLLECTABLE
ptr_t _auobjfreelist[MAXOBJSZ+1];
# endif
/* uncollectable but traced objs */
# ifdef GATHERSTATS
word _composite_in_use;
/* Number of words in accessible composite */
/* objects. */
word _atomic_in_use;
/* Number of words in accessible atomic */
/* objects. */
# endif
# ifdef USE_MUNMAP
word _unmapped_bytes;
# endif
# ifdef MERGE_SIZES
unsigned _size_map[WORDS_TO_BYTES(MAXOBJSZ+1)];
/* Number of words to allocate for a given allocation request in */
/* bytes. */
# endif
# ifdef STUBBORN_ALLOC
ptr_t _sobjfreelist[MAXOBJSZ+1];
# endif
/* free list for immutable objects */
map_entry_type * _obj_map[MAXOBJSZ+1];
/* If not NIL, then a pointer to a map of valid */
/* object addresses. _obj_map[sz][i] is j if the */
/* address block_start+i is a valid pointer */
/* to an object at block_start + */
/* WORDS_TO_BYTES(BYTES_TO_WORDS(i) - j) */
/* I.e. j is a word displacement from the */
/* object beginning. */
/* The entry is OBJ_INVALID if the corresponding */
/* address is not a valid pointer. It is */
/* OFFSET_TOO_BIG if the value j would be too */
/* large to fit in the entry. (Note that the */
/* size of these entries matters, both for */
/* space consumption and for cache utilization. */
# define OFFSET_TOO_BIG 0xfe
# define OBJ_INVALID 0xff
# define MAP_ENTRY(map, bytes) (map)[bytes]
# define MAP_ENTRIES HBLKSIZE
# define MAP_SIZE MAP_ENTRIES
# define CPP_MAX_OFFSET (OFFSET_TOO_BIG - 1)
# define MAX_OFFSET ((word)CPP_MAX_OFFSET)
/* The following are used only if GC_all_interior_ptrs != 0 */
# define VALID_OFFSET_SZ \
(CPP_MAX_OFFSET > WORDS_TO_BYTES(CPP_MAXOBJSZ)? \
CPP_MAX_OFFSET+1 \
: WORDS_TO_BYTES(CPP_MAXOBJSZ)+1)
char _valid_offsets[VALID_OFFSET_SZ];
/* GC_valid_offsets[i] == TRUE ==> i */
/* is registered as a displacement. */
# define OFFSET_VALID(displ) \
(GC_all_interior_pointers || GC_valid_offsets[displ])
char _modws_valid_offsets[sizeof(word)];
/* GC_valid_offsets[i] ==> */
/* GC_modws_valid_offsets[i%sizeof(word)] */
# ifdef STUBBORN_ALLOC
page_hash_table _changed_pages;
/* Stubborn object pages that were changes since last call to */
/* GC_read_changed. */
page_hash_table _prev_changed_pages;
/* Stubborn object pages that were changes before last call to */
/* GC_read_changed. */
# endif
# if defined(PROC_VDB) || defined(MPROTECT_VDB)
page_hash_table _grungy_pages; /* Pages that were dirty at last */
/* GC_read_dirty. */
# endif
# ifdef MPROTECT_VDB
VOLATILE page_hash_table _dirty_pages;
/* Pages dirtied since last GC_read_dirty. */
# endif
# ifdef PROC_VDB
page_hash_table _written_pages; /* Pages ever dirtied */
# endif
# ifdef LARGE_CONFIG
# if CPP_WORDSZ > 32
# define MAX_HEAP_SECTS 4096 /* overflows at roughly 64 GB */
# else
# define MAX_HEAP_SECTS 768 /* Separately added heap sections. */
# endif
# else
# ifdef SMALL_CONFIG
# define MAX_HEAP_SECTS 128 /* Roughly 1GB */
# else
# define MAX_HEAP_SECTS 384 /* Roughly 3GB */
# endif
# endif
struct HeapSect {
ptr_t hs_start; word hs_bytes;
} _heap_sects[MAX_HEAP_SECTS];
# if defined(MSWIN32) || defined(MSWINCE)
ptr_t _heap_bases[MAX_HEAP_SECTS];
/* Start address of memory regions obtained from kernel. */
# endif
# ifdef MSWINCE
word _heap_lengths[MAX_HEAP_SECTS];
/* Commited lengths of memory regions obtained from kernel. */
# endif
struct roots _static_roots[MAX_ROOT_SETS];
# if !defined(MSWIN32) && !defined(MSWINCE)
struct roots * _root_index[RT_SIZE];
# endif
struct exclusion _excl_table[MAX_EXCLUSIONS];
/* Block header index; see gc_headers.h */
bottom_index * _all_nils;
bottom_index * _top_index [TOP_SZ];
#ifdef SAVE_CALL_CHAIN
struct callinfo _last_stack[NFRAMES]; /* Stack at last garbage collection.*/
/* Useful for debugging mysterious */
/* object disappearances. */
/* In the multithreaded case, we */
/* currently only save the calling */
/* stack. */
#endif
};
GC_API GC_FAR struct _GC_arrays GC_arrays;
# ifndef SEPARATE_GLOBALS
# define GC_objfreelist GC_arrays._objfreelist
# define GC_aobjfreelist GC_arrays._aobjfreelist
# define GC_words_allocd GC_arrays._words_allocd
# endif
# define GC_uobjfreelist GC_arrays._uobjfreelist
# ifdef ATOMIC_UNCOLLECTABLE
# define GC_auobjfreelist GC_arrays._auobjfreelist
# endif
# define GC_sobjfreelist GC_arrays._sobjfreelist
# define GC_valid_offsets GC_arrays._valid_offsets
# define GC_modws_valid_offsets GC_arrays._modws_valid_offsets
# ifdef STUBBORN_ALLOC
# define GC_changed_pages GC_arrays._changed_pages
# define GC_prev_changed_pages GC_arrays._prev_changed_pages
# endif
# define GC_obj_map GC_arrays._obj_map
# define GC_last_heap_addr GC_arrays._last_heap_addr
# define GC_prev_heap_addr GC_arrays._prev_heap_addr
# define GC_words_wasted GC_arrays._words_wasted
# define GC_large_free_bytes GC_arrays._large_free_bytes
# define GC_large_allocd_bytes GC_arrays._large_allocd_bytes
# define GC_max_large_allocd_bytes GC_arrays._max_large_allocd_bytes
# define GC_words_finalized GC_arrays._words_finalized
# define GC_non_gc_bytes_at_gc GC_arrays._non_gc_bytes_at_gc
# define GC_mem_freed GC_arrays._mem_freed
# define GC_scratch_end_ptr GC_arrays._scratch_end_ptr
# define GC_scratch_last_end_ptr GC_arrays._scratch_last_end_ptr
# define GC_mark_procs GC_arrays._mark_procs
# define GC_heapsize GC_arrays._heapsize
# define GC_max_heapsize GC_arrays._max_heapsize
# define GC_requested_heapsize GC_arrays._requested_heapsize
# define GC_words_allocd_before_gc GC_arrays._words_allocd_before_gc
# define GC_heap_sects GC_arrays._heap_sects
# define GC_last_stack GC_arrays._last_stack
# ifdef USE_MUNMAP
# define GC_unmapped_bytes GC_arrays._unmapped_bytes
# endif
# if defined(MSWIN32) || defined(MSWINCE)
# define GC_heap_bases GC_arrays._heap_bases
# endif
# ifdef MSWINCE
# define GC_heap_lengths GC_arrays._heap_lengths
# endif
# define GC_static_roots GC_arrays._static_roots
# define GC_root_index GC_arrays._root_index
# define GC_excl_table GC_arrays._excl_table
# define GC_all_nils GC_arrays._all_nils
# define GC_top_index GC_arrays._top_index
# if defined(PROC_VDB) || defined(MPROTECT_VDB)
# define GC_grungy_pages GC_arrays._grungy_pages
# endif
# ifdef MPROTECT_VDB
# define GC_dirty_pages GC_arrays._dirty_pages
# endif
# ifdef PROC_VDB
# define GC_written_pages GC_arrays._written_pages
# endif
# ifdef GATHERSTATS
# define GC_composite_in_use GC_arrays._composite_in_use
# define GC_atomic_in_use GC_arrays._atomic_in_use
# endif
# ifdef MERGE_SIZES
# define GC_size_map GC_arrays._size_map
# endif
# define beginGC_arrays ((ptr_t)(&GC_arrays))
# define endGC_arrays (((ptr_t)(&GC_arrays)) + (sizeof GC_arrays))
#define USED_HEAP_SIZE (GC_heapsize - GC_large_free_bytes)
/* Object kinds: */
# define MAXOBJKINDS 16
extern struct obj_kind {
ptr_t *ok_freelist; /* Array of free listheaders for this kind of object */
/* Point either to GC_arrays or to storage allocated */
/* with GC_scratch_alloc. */
struct hblk **ok_reclaim_list;
/* List headers for lists of blocks waiting to be */
/* swept. */
word ok_descriptor; /* Descriptor template for objects in this */
/* block. */
GC_bool ok_relocate_descr;
/* Add object size in bytes to descriptor */
/* template to obtain descriptor. Otherwise */
/* template is used as is. */
GC_bool ok_init; /* Clear objects before putting them on the free list. */
} GC_obj_kinds[MAXOBJKINDS];
# define beginGC_obj_kinds ((ptr_t)(&GC_obj_kinds))
# define endGC_obj_kinds (beginGC_obj_kinds + (sizeof GC_obj_kinds))
/* Variables that used to be in GC_arrays, but need to be accessed by */
/* inline allocation code. If they were in GC_arrays, the inlined */
/* allocation code would include GC_arrays offsets (as it did), which */
/* introduce maintenance problems. */
#ifdef SEPARATE_GLOBALS
word GC_words_allocd;
/* Number of words allocated during this collection cycle */
ptr_t GC_objfreelist[MAXOBJSZ+1];
/* free list for NORMAL objects */
# define beginGC_objfreelist ((ptr_t)(&GC_objfreelist))
# define endGC_objfreelist (beginGC_objfreelist + sizeof(GC_objfreelist))
ptr_t GC_aobjfreelist[MAXOBJSZ+1];
/* free list for atomic (PTRFREE) objs */
# define beginGC_aobjfreelist ((ptr_t)(&GC_aobjfreelist))
# define endGC_aobjfreelist (beginGC_aobjfreelist + sizeof(GC_aobjfreelist))
#endif
/* Predefined kinds: */
# define PTRFREE 0
# define NORMAL 1
# define UNCOLLECTABLE 2
# ifdef ATOMIC_UNCOLLECTABLE
# define AUNCOLLECTABLE 3
# define STUBBORN 4
# define IS_UNCOLLECTABLE(k) (((k) & ~1) == UNCOLLECTABLE)
# else
# define STUBBORN 3
# define IS_UNCOLLECTABLE(k) ((k) == UNCOLLECTABLE)
# endif
extern int GC_n_kinds;
GC_API word GC_fo_entries;
extern word GC_n_heap_sects; /* Number of separately added heap */
/* sections. */
extern word GC_page_size;
# if defined(MSWIN32) || defined(MSWINCE)
struct _SYSTEM_INFO;
extern struct _SYSTEM_INFO GC_sysinfo;
extern word GC_n_heap_bases; /* See GC_heap_bases. */
# endif
extern word GC_total_stack_black_listed;
/* Number of bytes on stack blacklist. */
extern word GC_black_list_spacing;
/* Average number of bytes between blacklisted */
/* blocks. Approximate. */
/* Counts only blocks that are */
/* "stack-blacklisted", i.e. that are */
/* problematic in the interior of an object. */
extern map_entry_type * GC_invalid_map;
/* Pointer to the nowhere valid hblk map */
/* Blocks pointing to this map are free. */
extern struct hblk * GC_hblkfreelist[];
/* List of completely empty heap blocks */
/* Linked through hb_next field of */
/* header structure associated with */
/* block. */
extern GC_bool GC_is_initialized; /* GC_init() has been run. */
extern GC_bool GC_objects_are_marked; /* There are marked objects in */
/* the heap. */
#ifndef SMALL_CONFIG
extern GC_bool GC_incremental;
/* Using incremental/generational collection. */
#else
# define GC_incremental FALSE
/* Hopefully allow optimizer to remove some code. */
#endif
extern GC_bool GC_dirty_maintained;
/* Dirty bits are being maintained, */
/* either for incremental collection, */
/* or to limit the root set. */
extern word GC_root_size; /* Total size of registered root sections */
extern GC_bool GC_debugging_started; /* GC_debug_malloc has been called. */
/* Operations */
# ifndef abs
# define abs(x) ((x) < 0? (-(x)) : (x))
# endif
/* Marks are in a reserved area in */
/* each heap block. Each word has one mark bit associated */
/* with it. Only those corresponding to the beginning of an */
/* object are used. */
/* Set mark bit correctly, even if mark bits may be concurrently */
/* accessed. */
#ifdef PARALLEL_MARK
# define OR_WORD(addr, bits) \
{ word old; \
do { \
old = *((volatile word *)addr); \
} while (!GC_compare_and_exchange((addr), old, old | (bits))); \
}
# define OR_WORD_EXIT_IF_SET(addr, bits, exit_label) \
{ word old; \
word my_bits = (bits); \
do { \
old = *((volatile word *)addr); \
if (old & my_bits) goto exit_label; \
} while (!GC_compare_and_exchange((addr), old, old | my_bits)); \
}
#else
# define OR_WORD(addr, bits) *(addr) |= (bits)
# define OR_WORD_EXIT_IF_SET(addr, bits, exit_label) \
{ \
word old = *(addr); \
word my_bits = (bits); \
if (old & my_bits) goto exit_label; \
*(addr) = (old | my_bits); \
}
#endif
/* Mark bit operations */
/*
* Retrieve, set, clear the mark bit corresponding
* to the nth word in a given heap block.
*
* (Recall that bit n corresponds to object beginning at word n
* relative to the beginning of the block, including unused words)
*/
#ifdef USE_MARK_BYTES
# define mark_bit_from_hdr(hhdr,n) ((hhdr)->hb_marks[(n) >> 1])
# define set_mark_bit_from_hdr(hhdr,n) ((hhdr)->hb_marks[(n)>>1]) = 1
# define clear_mark_bit_from_hdr(hhdr,n) ((hhdr)->hb_marks[(n)>>1]) = 0
#else /* !USE_MARK_BYTES */
# define mark_bit_from_hdr(hhdr,n) (((hhdr)->hb_marks[divWORDSZ(n)] \
>> (modWORDSZ(n))) & (word)1)
# define set_mark_bit_from_hdr(hhdr,n) \
OR_WORD((hhdr)->hb_marks+divWORDSZ(n), \
(word)1 << modWORDSZ(n))
# define clear_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \
&= ~((word)1 << modWORDSZ(n))
#endif /* !USE_MARK_BYTES */
/* Important internal collector routines */
ptr_t GC_approx_sp GC_PROTO((void));
GC_bool GC_should_collect GC_PROTO((void));
void GC_apply_to_all_blocks GC_PROTO(( \
void (*fn) GC_PROTO((struct hblk *h, word client_data)), \
word client_data));
/* Invoke fn(hbp, client_data) for each */
/* allocated heap block. */
struct hblk * GC_next_used_block GC_PROTO((struct hblk * h));
/* Return first in-use block >= h */
struct hblk * GC_prev_block GC_PROTO((struct hblk * h));
/* Return last block <= h. Returned block */
/* is managed by GC, but may or may not be in */
/* use. */
void GC_mark_init GC_PROTO((void));
void GC_clear_marks GC_PROTO((void)); /* Clear mark bits for all heap objects. */
void GC_invalidate_mark_state GC_PROTO((void));
/* Tell the marker that marked */
/* objects may point to unmarked */
/* ones, and roots may point to */
/* unmarked objects. */
/* Reset mark stack. */
GC_bool GC_mark_stack_empty GC_PROTO((void));
GC_bool GC_mark_some GC_PROTO((ptr_t cold_gc_frame));
/* Perform about one pages worth of marking */
/* work of whatever kind is needed. Returns */
/* quickly if no collection is in progress. */
/* Return TRUE if mark phase finished. */
void GC_initiate_gc GC_PROTO((void));
/* initiate collection. */
/* If the mark state is invalid, this */
/* becomes full colleection. Otherwise */
/* it's partial. */
void GC_push_all GC_PROTO((ptr_t bottom, ptr_t top));
/* Push everything in a range */
/* onto mark stack. */
void GC_push_selected GC_PROTO(( \
ptr_t bottom, \
ptr_t top, \
int (*dirty_fn) GC_PROTO((struct hblk *h)), \
void (*push_fn) GC_PROTO((ptr_t bottom, ptr_t top)) ));
/* Push all pages h in [b,t) s.t. */
/* select_fn(h) != 0 onto mark stack. */
#ifndef SMALL_CONFIG
void GC_push_conditional GC_PROTO((ptr_t b, ptr_t t, GC_bool all));
#else
# define GC_push_conditional(b, t, all) GC_push_all(b, t)
#endif
/* Do either of the above, depending */
/* on the third arg. */
void GC_push_all_stack GC_PROTO((ptr_t b, ptr_t t));
/* As above, but consider */
/* interior pointers as valid */
void GC_push_all_eager GC_PROTO((ptr_t b, ptr_t t));
/* Same as GC_push_all_stack, but */
/* ensures that stack is scanned */
/* immediately, not just scheduled */
/* for scanning. */
#ifndef THREADS
void GC_push_all_stack_partially_eager GC_PROTO(( \
ptr_t bottom, ptr_t top, ptr_t cold_gc_frame ));
/* Similar to GC_push_all_eager, but only the */
/* part hotter than cold_gc_frame is scanned */
/* immediately. Needed to ensure that callee- */
/* save registers are not missed. */
#else
/* In the threads case, we push part of the current thread stack */
/* with GC_push_all_eager when we push the registers. This gets the */
/* callee-save registers that may disappear. The remainder of the */
/* stacks are scheduled for scanning in *GC_push_other_roots, which */
/* is thread-package-specific. */
#endif
void GC_push_current_stack GC_PROTO((ptr_t cold_gc_frame));
/* Push enough of the current stack eagerly to */
/* ensure that callee-save registers saved in */
/* GC frames are scanned. */
/* In the non-threads case, schedule entire */
/* stack for scanning. */
void GC_push_roots GC_PROTO((GC_bool all, ptr_t cold_gc_frame));
/* Push all or dirty roots. */
extern void (*GC_push_other_roots) GC_PROTO((void));
/* Push system or application specific roots */
/* onto the mark stack. In some environments */
/* (e.g. threads environments) this is */
/* predfined to be non-zero. A client supplied */
/* replacement should also call the original */
/* function. */
extern void GC_push_gc_structures GC_PROTO((void));
/* Push GC internal roots. These are normally */
/* included in the static data segment, and */
/* Thus implicitly pushed. But we must do this */
/* explicitly if normal root processing is */
/* disabled. Calls the following: */
extern void GC_push_finalizer_structures GC_PROTO((void));
extern void GC_push_stubborn_structures GC_PROTO((void));
# ifdef THREADS
extern void GC_push_thread_structures GC_PROTO((void));
# endif
extern void (*GC_start_call_back) GC_PROTO((void));
/* Called at start of full collections. */
/* Not called if 0. Called with allocation */
/* lock held. */
/* 0 by default. */
# if defined(USE_GENERIC_PUSH_REGS)
void GC_generic_push_regs GC_PROTO((ptr_t cold_gc_frame));
# else
void GC_push_regs GC_PROTO((void));
# endif
/* Push register contents onto mark stack. */
/* If NURSERY is defined, the default push */
/* action can be overridden with GC_push_proc */
# ifdef NURSERY
extern void (*GC_push_proc)(ptr_t);
# endif
# if defined(MSWIN32) || defined(MSWINCE)
void __cdecl GC_push_one GC_PROTO((word p));
# else
void GC_push_one GC_PROTO((word p));
/* If p points to an object, mark it */
/* and push contents on the mark stack */
/* Pointer recognition test always */
/* accepts interior pointers, i.e. this */
/* is appropriate for pointers found on */
/* stack. */
# endif
# if defined(PRINT_BLACK_LIST) || defined(KEEP_BACK_PTRS)
void GC_mark_and_push_stack GC_PROTO((word p, ptr_t source));
/* Ditto, omits plausibility test */
# else
void GC_mark_and_push_stack GC_PROTO((word p));
# endif
void GC_push_marked GC_PROTO((struct hblk * h, hdr * hhdr));
/* Push contents of all marked objects in h onto */
/* mark stack. */
#ifdef SMALL_CONFIG
# define GC_push_next_marked_dirty(h) GC_push_next_marked(h)
#else
struct hblk * GC_push_next_marked_dirty GC_PROTO((struct hblk * h));
/* Invoke GC_push_marked on next dirty block above h. */
/* Return a pointer just past the end of this block. */
#endif /* !SMALL_CONFIG */
struct hblk * GC_push_next_marked GC_PROTO((struct hblk * h));
/* Ditto, but also mark from clean pages. */
struct hblk * GC_push_next_marked_uncollectable GC_PROTO((struct hblk * h));
/* Ditto, but mark only from uncollectable pages. */
GC_bool GC_stopped_mark GC_PROTO((GC_stop_func stop_func));
/* Stop world and mark from all roots */
/* and rescuers. */
void GC_clear_hdr_marks GC_PROTO((hdr * hhdr));
/* Clear the mark bits in a header */
void GC_set_hdr_marks GC_PROTO((hdr * hhdr));
/* Set the mark bits in a header */
void GC_set_fl_marks GC_PROTO((ptr_t p));
/* Set all mark bits associated with */
/* a free list. */
void GC_add_roots_inner GC_PROTO((char * b, char * e, GC_bool tmp));
GC_bool GC_is_static_root GC_PROTO((ptr_t p));
/* Is the address p in one of the registered static */
/* root sections? */
# if defined(MSWIN32) || defined(_WIN32_WCE_EMULATION)
GC_bool GC_is_tmp_root GC_PROTO((ptr_t p));
/* Is the address p in one of the temporary static */
/* root sections? */
# endif
void GC_register_dynamic_libraries GC_PROTO((void));
/* Add dynamic library data sections to the root set. */
/* Machine dependent startup routines */
ptr_t GC_get_stack_base GC_PROTO((void)); /* Cold end of stack */
#ifdef IA64
ptr_t GC_get_register_stack_base GC_PROTO((void));
/* Cold end of register stack. */
#endif
void GC_register_data_segments GC_PROTO((void));
/* Black listing: */
void GC_bl_init GC_PROTO((void));
# ifdef PRINT_BLACK_LIST
void GC_add_to_black_list_normal GC_PROTO((word p, ptr_t source));
/* Register bits as a possible future false */
/* reference from the heap or static data */
# define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
if (GC_all_interior_pointers) { \
GC_add_to_black_list_stack(bits, (ptr_t)(source)); \
} else { \
GC_add_to_black_list_normal(bits, (ptr_t)(source)); \
}
# else
void GC_add_to_black_list_normal GC_PROTO((word p));
# define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
if (GC_all_interior_pointers) { \
GC_add_to_black_list_stack(bits); \
} else { \
GC_add_to_black_list_normal(bits); \
}
# endif
# ifdef PRINT_BLACK_LIST
void GC_add_to_black_list_stack GC_PROTO((word p, ptr_t source));
# else
void GC_add_to_black_list_stack GC_PROTO((word p));
# endif
struct hblk * GC_is_black_listed GC_PROTO((struct hblk * h, word len));
/* If there are likely to be false references */
/* to a block starting at h of the indicated */
/* length, then return the next plausible */
/* starting location for h that might avoid */
/* these false references. */
void GC_promote_black_lists GC_PROTO((void));
/* Declare an end to a black listing phase. */
void GC_unpromote_black_lists GC_PROTO((void));
/* Approximately undo the effect of the above. */
/* This actually loses some information, but */
/* only in a reasonably safe way. */
word GC_number_stack_black_listed GC_PROTO(( \
struct hblk *start, struct hblk *endp1));
/* Return the number of (stack) blacklisted */
/* blocks in the range for statistical */
/* purposes. */
ptr_t GC_scratch_alloc GC_PROTO((word bytes));
/* GC internal memory allocation for */
/* small objects. Deallocation is not */
/* possible. */
/* Heap block layout maps: */
void GC_invalidate_map GC_PROTO((hdr * hhdr));
/* Remove the object map associated */
/* with the block. This identifies */
/* the block as invalid to the mark */
/* routines. */
GC_bool GC_add_map_entry GC_PROTO((word sz));
/* Add a heap block map for objects of */
/* size sz to obj_map. */
/* Return FALSE on failure. */
void GC_register_displacement_inner GC_PROTO((word offset));
/* Version of GC_register_displacement */
/* that assumes lock is already held */
/* and signals are already disabled. */
/* hblk allocation: */
void GC_new_hblk GC_PROTO((word size_in_words, int kind));
/* Allocate a new heap block, and build */
/* a free list in it. */
ptr_t GC_build_fl GC_PROTO((struct hblk *h, word sz,
GC_bool clear, ptr_t list));
/* Build a free list for objects of */
/* size sz in block h. Append list to */
/* end of the free lists. Possibly */
/* clear objects on the list. Normally */
/* called by GC_new_hblk, but also */
/* called explicitly without GC lock. */
struct hblk * GC_allochblk GC_PROTO(( \
word size_in_words, int kind, unsigned flags));
/* Allocate a heap block, inform */
/* the marker that block is valid */
/* for objects of indicated size. */
ptr_t GC_alloc_large GC_PROTO((word lw, int k, unsigned flags));
/* Allocate a large block of size lw words. */
/* The block is not cleared. */
/* Flags is 0 or IGNORE_OFF_PAGE. */
/* Calls GC_allchblk to do the actual */
/* allocation, but also triggers GC and/or */
/* heap expansion as appropriate. */
/* Does not update GC_words_allocd, but does */
/* other accounting. */
ptr_t GC_alloc_large_and_clear GC_PROTO((word lw, int k, unsigned flags));
/* As above, but clear block if appropriate */
/* for kind k. */
void GC_freehblk GC_PROTO((struct hblk * p));
/* Deallocate a heap block and mark it */
/* as invalid. */
/* Misc GC: */
void GC_init_inner GC_PROTO((void));
GC_bool GC_expand_hp_inner GC_PROTO((word n));
void GC_start_reclaim GC_PROTO((int abort_if_found));
/* Restore unmarked objects to free */
/* lists, or (if abort_if_found is */
/* TRUE) report them. */
/* Sweeping of small object pages is */
/* largely deferred. */
void GC_continue_reclaim GC_PROTO((word sz, int kind));
/* Sweep pages of the given size and */
/* kind, as long as possible, and */
/* as long as the corr. free list is */
/* empty. */
void GC_reclaim_or_delete_all GC_PROTO((void));
/* Arrange for all reclaim lists to be */
/* empty. Judiciously choose between */
/* sweeping and discarding each page. */
GC_bool GC_reclaim_all GC_PROTO((GC_stop_func stop_func, GC_bool ignore_old));
/* Reclaim all blocks. Abort (in a */
/* consistent state) if f returns TRUE. */
GC_bool GC_block_empty GC_PROTO((hdr * hhdr));
/* Block completely unmarked? */
GC_bool GC_never_stop_func GC_PROTO((void));
/* Returns FALSE. */
GC_bool GC_try_to_collect_inner GC_PROTO((GC_stop_func f));
/* Collect; caller must have acquired */
/* lock and disabled signals. */
/* Collection is aborted if f returns */
/* TRUE. Returns TRUE if it completes */
/* successfully. */
# define GC_gcollect_inner() \
(void) GC_try_to_collect_inner(GC_never_stop_func)
void GC_finish_collection GC_PROTO((void));
/* Finish collection. Mark bits are */
/* consistent and lock is still held. */
GC_bool GC_collect_or_expand GC_PROTO(( \
word needed_blocks, GC_bool ignore_off_page));
/* Collect or expand heap in an attempt */
/* make the indicated number of free */
/* blocks available. Should be called */
/* until the blocks are available or */
/* until it fails by returning FALSE. */
#if defined(MSWIN32) || defined(MSWINCE)
void GC_deinit GC_PROTO((void));
/* Free any resources allocated by */
/* GC_init */
#endif
void GC_collect_a_little_inner GC_PROTO((int n));
/* Do n units worth of garbage */
/* collection work, if appropriate. */
/* A unit is an amount appropriate for */
/* HBLKSIZE bytes of allocation. */
ptr_t GC_generic_malloc GC_PROTO((word lb, int k));
/* Allocate an object of the given */
/* kind. By default, there are only */
/* a few kinds: composite(pointerfree), */
/* atomic, uncollectable, etc. */
/* We claim it's possible for clever */
/* client code that understands GC */
/* internals to add more, e.g. to */
/* communicate object layout info */
/* to the collector. */
ptr_t GC_generic_malloc_ignore_off_page GC_PROTO((size_t b, int k));
/* As above, but pointers past the */
/* first page of the resulting object */
/* are ignored. */
ptr_t GC_generic_malloc_inner GC_PROTO((word lb, int k));
/* Ditto, but I already hold lock, etc. */
ptr_t GC_generic_malloc_words_small GC_PROTO((size_t lw, int k));
/* As above, but size in units of words */
/* Bypasses MERGE_SIZES. Assumes */
/* words <= MAXOBJSZ. */
ptr_t GC_generic_malloc_inner_ignore_off_page GC_PROTO((size_t lb, int k));
/* Allocate an object, where */
/* the client guarantees that there */
/* will always be a pointer to the */
/* beginning of the object while the */
/* object is live. */
ptr_t GC_allocobj GC_PROTO((word sz, int kind));
/* Make the indicated */
/* free list nonempty, and return its */
/* head. */
void GC_init_headers GC_PROTO((void));
struct hblkhdr * GC_install_header GC_PROTO((struct hblk *h));
/* Install a header for block h. */
/* Return 0 on failure, or the header */
/* otherwise. */
GC_bool GC_install_counts GC_PROTO((struct hblk * h, word sz));
/* Set up forwarding counts for block */
/* h of size sz. */
/* Return FALSE on failure. */
void GC_remove_header GC_PROTO((struct hblk * h));
/* Remove the header for block h. */
void GC_remove_counts GC_PROTO((struct hblk * h, word sz));
/* Remove forwarding counts for h. */
hdr * GC_find_header GC_PROTO((ptr_t h)); /* Debugging only. */
void GC_finalize GC_PROTO((void));
/* Perform all indicated finalization actions */
/* on unmarked objects. */
/* Unreachable finalizable objects are enqueued */
/* for processing by GC_invoke_finalizers. */
/* Invoked with lock. */
void GC_notify_or_invoke_finalizers GC_PROTO((void));
/* If GC_finalize_on_demand is not set, invoke */
/* eligible finalizers. Otherwise: */
/* Call *GC_finalizer_notifier if there are */
/* finalizers to be run, and we haven't called */
/* this procedure yet this GC cycle. */
void GC_add_to_heap GC_PROTO((struct hblk *p, word bytes));
/* Add a HBLKSIZE aligned chunk to the heap. */
void GC_print_obj GC_PROTO((ptr_t p));
/* P points to somewhere inside an object with */
/* debugging info. Print a human readable */
/* description of the object to stderr. */
extern void (*GC_check_heap) GC_PROTO((void));
/* Check that all objects in the heap with */
/* debugging info are intact. Print */
/* descriptions of any that are not. */
extern void (*GC_print_heap_obj) GC_PROTO((ptr_t p));
/* If possible print s followed by a more */
/* detailed description of the object */
/* referred to by p. */
extern GC_bool GC_print_stats; /* Produce at least some logging output */
/* Set from environment variable. */
/* Macros used for collector internal allocation. */
/* These assume the collector lock is held. */
#ifdef DBG_HDRS_ALL
extern GC_PTR GC_debug_generic_malloc_inner(size_t lb, int k);
extern GC_PTR GC_debug_generic_malloc_inner_ignore_off_page(size_t lb,
int k);
# define GC_INTERNAL_MALLOC GC_debug_generic_malloc_inner
# define GC_INTERNAL_MALLOC_IGNORE_OFF_PAGE \
GC_debug_generic_malloc_inner_ignore_off_page
# ifdef THREADS
# define GC_INTERNAL_FREE GC_debug_free_inner
# else
# define GC_INTERNAL_FREE GC_debug_free
# endif
#else
# define GC_INTERNAL_MALLOC GC_generic_malloc_inner
# define GC_INTERNAL_MALLOC_IGNORE_OFF_PAGE \
GC_generic_malloc_inner_ignore_off_page
# ifdef THREADS
# define GC_INTERNAL_FREE GC_free_inner
# else
# define GC_INTERNAL_FREE GC_free
# endif
#endif
/* Memory unmapping: */
#ifdef USE_MUNMAP
void GC_unmap_old(void);
void GC_merge_unmapped(void);
void GC_unmap(ptr_t start, word bytes);
void GC_remap(ptr_t start, word bytes);
void GC_unmap_gap(ptr_t start1, word bytes1, ptr_t start2, word bytes2);
#endif
/* Virtual dirty bit implementation: */
/* Each implementation exports the following: */
void GC_read_dirty GC_PROTO((void));
/* Retrieve dirty bits. */
GC_bool GC_page_was_dirty GC_PROTO((struct hblk *h));
/* Read retrieved dirty bits. */
GC_bool GC_page_was_ever_dirty GC_PROTO((struct hblk *h));
/* Could the page contain valid heap pointers? */
void GC_is_fresh GC_PROTO((struct hblk *h, word n));
/* Assert the region currently contains no */
/* valid pointers. */
void GC_write_hint GC_PROTO((struct hblk *h));
/* h is about to be written. */
void GC_dirty_init GC_PROTO((void));
/* Slow/general mark bit manipulation: */
GC_API GC_bool GC_is_marked GC_PROTO((ptr_t p));
void GC_clear_mark_bit GC_PROTO((ptr_t p));
void GC_set_mark_bit GC_PROTO((ptr_t p));
/* Stubborn objects: */
void GC_read_changed GC_PROTO((void)); /* Analogous to GC_read_dirty */
GC_bool GC_page_was_changed GC_PROTO((struct hblk * h));
/* Analogous to GC_page_was_dirty */
void GC_clean_changing_list GC_PROTO((void));
/* Collect obsolete changing list entries */
void GC_stubborn_init GC_PROTO((void));
/* Debugging print routines: */
void GC_print_block_list GC_PROTO((void));
void GC_print_hblkfreelist GC_PROTO((void));
void GC_print_heap_sects GC_PROTO((void));
void GC_print_static_roots GC_PROTO((void));
void GC_dump GC_PROTO((void));
#ifdef KEEP_BACK_PTRS
void GC_store_back_pointer(ptr_t source, ptr_t dest);
void GC_marked_for_finalization(ptr_t dest);
# define GC_STORE_BACK_PTR(source, dest) GC_store_back_pointer(source, dest)
# define GC_MARKED_FOR_FINALIZATION(dest) GC_marked_for_finalization(dest)
#else
# define GC_STORE_BACK_PTR(source, dest)
# define GC_MARKED_FOR_FINALIZATION(dest)
#endif
/* Make arguments appear live to compiler */
# ifdef __WATCOMC__
void GC_noop(void*, ...);
# else
# ifdef __DMC__
GC_API void GC_noop(...);
# else
GC_API void GC_noop();
# endif
# endif
void GC_noop1 GC_PROTO((word));
/* Logging and diagnostic output: */
GC_API void GC_printf GC_PROTO((GC_CONST char * format, long, long, long, long, long, long));
/* A version of printf that doesn't allocate, */
/* is restricted to long arguments, and */
/* (unfortunately) doesn't use varargs for */
/* portability. Restricted to 6 args and */
/* 1K total output length. */
/* (We use sprintf. Hopefully that doesn't */
/* allocate for long arguments.) */
# define GC_printf0(f) GC_printf(f, 0l, 0l, 0l, 0l, 0l, 0l)
# define GC_printf1(f,a) GC_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l)
# define GC_printf2(f,a,b) GC_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l)
# define GC_printf3(f,a,b,c) GC_printf(f, (long)a, (long)b, (long)c, 0l, 0l, 0l)
# define GC_printf4(f,a,b,c,d) GC_printf(f, (long)a, (long)b, (long)c, \
(long)d, 0l, 0l)
# define GC_printf5(f,a,b,c,d,e) GC_printf(f, (long)a, (long)b, (long)c, \
(long)d, (long)e, 0l)
# define GC_printf6(f,a,b,c,d,e,g) GC_printf(f, (long)a, (long)b, (long)c, \
(long)d, (long)e, (long)g)
GC_API void GC_err_printf GC_PROTO((GC_CONST char * format, long, long, long, long, long, long));
# define GC_err_printf0(f) GC_err_puts(f)
# define GC_err_printf1(f,a) GC_err_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l)
# define GC_err_printf2(f,a,b) GC_err_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l)
# define GC_err_printf3(f,a,b,c) GC_err_printf(f, (long)a, (long)b, (long)c, \
0l, 0l, 0l)
# define GC_err_printf4(f,a,b,c,d) GC_err_printf(f, (long)a, (long)b, \
(long)c, (long)d, 0l, 0l)
# define GC_err_printf5(f,a,b,c,d,e) GC_err_printf(f, (long)a, (long)b, \
(long)c, (long)d, \
(long)e, 0l)
# define GC_err_printf6(f,a,b,c,d,e,g) GC_err_printf(f, (long)a, (long)b, \
(long)c, (long)d, \
(long)e, (long)g)
/* Ditto, writes to stderr. */
void GC_err_puts GC_PROTO((GC_CONST char *s));
/* Write s to stderr, don't buffer, don't add */
/* newlines, don't ... */
#if defined(LINUX) && !defined(SMALL_CONFIG)
void GC_err_write GC_PROTO((GC_CONST char *buf, size_t len));
/* Write buf to stderr, don't buffer, don't add */
/* newlines, don't ... */
#endif
# ifdef GC_ASSERTIONS
# define GC_ASSERT(expr) if(!(expr)) {\
GC_err_printf2("Assertion failure: %s:%ld\n", \
__FILE__, (unsigned long)__LINE__); \
ABORT("assertion failure"); }
# else
# define GC_ASSERT(expr)
# endif
# if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
/* We need additional synchronization facilities from the thread */
/* support. We believe these are less performance critical */
/* than the main garbage collector lock; standard pthreads-based */
/* implementations should be sufficient. */
/* The mark lock and condition variable. If the GC lock is also */
/* acquired, the GC lock must be acquired first. The mark lock is */
/* used to both protect some variables used by the parallel */
/* marker, and to protect GC_fl_builder_count, below. */
/* GC_notify_all_marker() is called when */
/* the state of the parallel marker changes */
/* in some significant way (see gc_mark.h for details). The */
/* latter set of events includes incrementing GC_mark_no. */
/* GC_notify_all_builder() is called when GC_fl_builder_count */
/* reaches 0. */
extern void GC_acquire_mark_lock();
extern void GC_release_mark_lock();
extern void GC_notify_all_builder();
/* extern void GC_wait_builder(); */
extern void GC_wait_for_reclaim();
extern word GC_fl_builder_count; /* Protected by mark lock. */
# endif /* PARALLEL_MARK || THREAD_LOCAL_ALLOC */
# ifdef PARALLEL_MARK
extern void GC_notify_all_marker();
extern void GC_wait_marker();
extern word GC_mark_no; /* Protected by mark lock. */
extern void GC_help_marker(word my_mark_no);
/* Try to help out parallel marker for mark cycle */
/* my_mark_no. Returns if the mark cycle finishes or */
/* was already done, or there was nothing to do for */
/* some other reason. */
# endif /* PARALLEL_MARK */
# if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS)
/* We define the thread suspension signal here, so that we can refer */
/* to it in the dirty bit implementation, if necessary. Ideally we */
/* would allocate a (real-time ?) signal using the standard mechanism.*/
/* unfortunately, there is no standard mechanism. (There is one */
/* in Linux glibc, but it's not exported.) Thus we continue to use */
/* the same hard-coded signals we've always used. */
# if !defined(SIG_SUSPEND)
# if defined(GC_LINUX_THREADS)
# if defined(SPARC) && !defined(SIGPWR)
/* SPARC/Linux doesn't properly define SIGPWR in <signal.h>.
* It is aliased to SIGLOST in asm/signal.h, though. */
# define SIG_SUSPEND SIGLOST
# else
/* Linuxthreads itself uses SIGUSR1 and SIGUSR2. */
# define SIG_SUSPEND SIGPWR
# endif
# else /* !GC_LINUX_THREADS */
# define SIG_SUSPEND _SIGRTMIN + 6
# endif
# endif /* !SIG_SUSPEND */
# endif
# endif /* GC_PRIVATE_H */
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