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📄 acl.h(12.79 KB)
📄 array.h(10.61 KB)
📄 ascii.h(579 B)
📄 attoptcache.h(725 B)
📄 builtins.h(47.77 KB)
📄 bytea.h(1.58 KB)
📄 cash.h(2.07 KB)
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📄 combocid.h(698 B)
📄 date.h(7.73 KB)
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📄 datum.h(1.48 KB)
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📄 fmgroids.h(61.09 KB)
📄 fmgrtab.h(1.15 KB)
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📄 geo_decls.h(15.86 KB)
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📄 guc_tables.h(7.15 KB)
📄 help_config.h(432 B)
📄 hsearch.h(5.51 KB)
📄 inet.h(2.66 KB)
📄 int8.h(4.03 KB)
📄 inval.h(1.81 KB)
📄 json.h(916 B)
📄 logtape.h(1.5 KB)
📄 lsyscache.h(6.51 KB)
📄 memutils.h(5.2 KB)
📄 nabstime.h(5.79 KB)
📄 numeric.h(1.88 KB)
📄 palloc.h(3.92 KB)
📄 pg_crc.h(4.36 KB)
📄 pg_crc_tables.h(19.73 KB)
📄 pg_locale.h(2.59 KB)
📄 pg_lzcompress.h(2.97 KB)
📄 pg_rusage.h(847 B)
📄 plancache.h(8.02 KB)
📄 portal.h(9.22 KB)
📄 probes.h(37.93 KB)
📄 ps_status.h(668 B)
📄 rangetypes.h(7.4 KB)
📄 rbtree.h(2.26 KB)
📄 rel.h(12.27 KB)
📄 relcache.h(3.17 KB)
📄 relmapper.h(1.68 KB)
📄 reltrigger.h(1.95 KB)
📄 resowner.h(5.07 KB)
📄 selfuncs.h(7.5 KB)
📄 snapmgr.h(1.59 KB)
📄 snapshot.h(2.59 KB)
📄 sortsupport.h(5.3 KB)
📄 spccache.h(556 B)
📄 syscache.h(5.51 KB)
📄 timestamp.h(9.5 KB)
📄 tqual.h(3.5 KB)
📄 tuplesort.h(4.62 KB)
📄 tuplestore.h(3.14 KB)
📄 typcache.h(4.26 KB)
📄 tzparser.h(1.13 KB)
📄 uuid.h(861 B)
📄 varbit.h(4.27 KB)
📄 xml.h(3.89 KB)

Editing: memutils.h

/*-------------------------------------------------------------------------
 *
 * memutils.h
 *	  This file contains declarations for memory allocation utility
 *	  functions.  These are functions that are not quite widely used
 *	  enough to justify going in utils/palloc.h, but are still part
 *	  of the API of the memory management subsystem.
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/utils/memutils.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef MEMUTILS_H
#define MEMUTILS_H

#include "nodes/memnodes.h"

/*
 * MaxAllocSize
 *		Quasi-arbitrary limit on size of allocations.
 *
 * Note:
 *		There is no guarantee that allocations smaller than MaxAllocSize
 *		will succeed.  Allocation requests larger than MaxAllocSize will
 *		be summarily denied.
 *
 * XXX This is deliberately chosen to correspond to the limiting size
 * of varlena objects under TOAST.  See VARSIZE_4B() and related macros
 * in postgres.h.  Many datatypes assume that any allocatable size can
 * be represented in a varlena header.
 *
 * XXX Also, various places in aset.c assume they can compute twice an
 * allocation's size without overflow, so beware of raising this.
 */
#define MaxAllocSize	((Size) 0x3fffffff)		/* 1 gigabyte - 1 */

#define AllocSizeIsValid(size)	((Size) (size) <= MaxAllocSize)

/*
 * All chunks allocated by any memory context manager are required to be
 * preceded by a StandardChunkHeader at a spacing of STANDARDCHUNKHEADERSIZE.
 * A currently-allocated chunk must contain a backpointer to its owning
 * context as well as the allocated size of the chunk.  The backpointer is
 * used by pfree() and repalloc() to find the context to call.  The allocated
 * size is not absolutely essential, but it's expected to be needed by any
 * reasonable implementation.
 */
typedef struct StandardChunkHeader
{
	MemoryContext context;		/* owning context */
	Size		size;			/* size of data space allocated in chunk */
#ifdef MEMORY_CONTEXT_CHECKING
	/* when debugging memory usage, also store actual requested size */
	Size		requested_size;
#endif
} StandardChunkHeader;

#define STANDARDCHUNKHEADERSIZE  MAXALIGN(sizeof(StandardChunkHeader))

/*
 * Standard top-level memory contexts.
 *
 * Only TopMemoryContext and ErrorContext are initialized by
 * MemoryContextInit() itself.
 */
extern PGDLLIMPORT MemoryContext TopMemoryContext;
extern PGDLLIMPORT MemoryContext ErrorContext;
extern PGDLLIMPORT MemoryContext PostmasterContext;
extern PGDLLIMPORT MemoryContext CacheMemoryContext;
extern PGDLLIMPORT MemoryContext MessageContext;
extern PGDLLIMPORT MemoryContext TopTransactionContext;
extern PGDLLIMPORT MemoryContext CurTransactionContext;

/* This is a transient link to the active portal's memory context: */
extern PGDLLIMPORT MemoryContext PortalContext;

/*
 * Memory-context-type-independent functions in mcxt.c
 */
extern void MemoryContextInit(void);
extern void MemoryContextReset(MemoryContext context);
extern void MemoryContextDelete(MemoryContext context);
extern void MemoryContextResetChildren(MemoryContext context);
extern void MemoryContextDeleteChildren(MemoryContext context);
extern void MemoryContextResetAndDeleteChildren(MemoryContext context);
extern void MemoryContextSetParent(MemoryContext context,
					   MemoryContext new_parent);
extern Size GetMemoryChunkSpace(void *pointer);
extern MemoryContext GetMemoryChunkContext(void *pointer);
extern MemoryContext MemoryContextGetParent(MemoryContext context);
extern bool MemoryContextIsEmpty(MemoryContext context);
extern void MemoryContextStats(MemoryContext context);

#ifdef MEMORY_CONTEXT_CHECKING
extern void MemoryContextCheck(MemoryContext context);
#endif
extern bool MemoryContextContains(MemoryContext context, void *pointer);

/*
 * This routine handles the context-type-independent part of memory
 * context creation.  It's intended to be called from context-type-
 * specific creation routines, and noplace else.
 */
extern MemoryContext MemoryContextCreate(NodeTag tag, Size size,
					MemoryContextMethods *methods,
					MemoryContext parent,
					const char *name);

/*
 * Memory-context-type-specific functions
 */

/* aset.c */
extern MemoryContext AllocSetContextCreate(MemoryContext parent,
					  const char *name,
					  Size minContextSize,
					  Size initBlockSize,
					  Size maxBlockSize);

/*
 * Recommended default alloc parameters, suitable for "ordinary" contexts
 * that might hold quite a lot of data.
 */
#define ALLOCSET_DEFAULT_MINSIZE   0
#define ALLOCSET_DEFAULT_INITSIZE  (8 * 1024)
#define ALLOCSET_DEFAULT_MAXSIZE   (8 * 1024 * 1024)

/*
 * Recommended alloc parameters for "small" contexts that are not expected
 * to contain much data (for example, a context to contain a query plan).
 */
#define ALLOCSET_SMALL_MINSIZE	 0
#define ALLOCSET_SMALL_INITSIZE  (1 * 1024)
#define ALLOCSET_SMALL_MAXSIZE	 (8 * 1024)

/*
 * Threshold above which a request in an AllocSet context is certain to be
 * allocated separately (and thereby have constant allocation overhead).
 * Few callers should be interested in this, but tuplesort/tuplestore need
 * to know it.
 */
#define ALLOCSET_SEPARATE_THRESHOLD  8192

#endif   /* MEMUTILS_H */

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Editing: memutils.h

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