palloc.h

来自「PostgreSQL7.4.6 for Linux」· C头文件 代码 · 共 84 行

/*-------------------------------------------------------------------------
 *
 * palloc.h
 *	  POSTGRES memory allocator definitions.
 *
 * This file contains the basic memory allocation interface that is
 * needed by almost every backend module.  It is included directly by
 * postgres.h, so the definitions here are automatically available
 * everywhere.	Keep it lean!
 *
 * Memory allocation occurs within "contexts".	Every chunk obtained from
 * palloc()/MemoryContextAlloc() is allocated within a specific context.
 * The entire contents of a context can be freed easily and quickly by
 * resetting or deleting the context --- this is both faster and less
 * prone to memory-leakage bugs than releasing chunks individually.
 * We organize contexts into context trees to allow fine-grain control
 * over chunk lifetime while preserving the certainty that we will free
 * everything that should be freed.  See utils/mmgr/README for more info.
 *
 *
 * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $Id: palloc.h,v 1.26 2003/08/04 02:40:15 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef PALLOC_H
#define PALLOC_H

/*
 * Type MemoryContextData is declared in nodes/memnodes.h.	Most users
 * of memory allocation should just treat it as an abstract type, so we
 * do not provide the struct contents here.
 */
typedef struct MemoryContextData *MemoryContext;

/*
 * CurrentMemoryContext is the default allocation context for palloc().
 * We declare it here so that palloc() can be a macro.	Avoid accessing it
 * directly!  Instead, use MemoryContextSwitchTo() to change the setting.
 */
extern DLLIMPORT MemoryContext CurrentMemoryContext;

/*
 * Fundamental memory-allocation operations (more are in utils/memutils.h)
 */
extern void *MemoryContextAlloc(MemoryContext context, Size size);
extern void *MemoryContextAllocZero(MemoryContext context, Size size);
extern void *MemoryContextAllocZeroAligned(MemoryContext context, Size size);

#define palloc(sz)	MemoryContextAlloc(CurrentMemoryContext, (sz))

#define palloc0(sz) MemoryContextAllocZero(CurrentMemoryContext, (sz))

/*
 * The result of palloc() is always word-aligned, so we can skip testing
 * alignment of the pointer when deciding which MemSet variant to use.
 * Note that this variant does not offer any advantage, and should not be
 * used, unless its "sz" argument is a compile-time constant; therefore, the
 * issue that it evaluates the argument multiple times isn't a problem in
 * practice.
 */
#define palloc0fast(sz) \
	( MemSetTest(0, sz) ? \
		MemoryContextAllocZeroAligned(CurrentMemoryContext, sz) : \
		MemoryContextAllocZero(CurrentMemoryContext, sz) )

extern void pfree(void *pointer);

extern void *repalloc(void *pointer, Size size);

extern MemoryContext MemoryContextSwitchTo(MemoryContext context);

/*
 * These are like standard strdup() except the copied string is
 * allocated in a context, not with malloc().
 */
extern char *MemoryContextStrdup(MemoryContext context, const char *string);

#define pstrdup(str)  MemoryContextStrdup(CurrentMemoryContext, (str))

#endif   /* PALLOC_H */