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/*-------------------------------------------------------------------------
*
* mcxt.h
* POSTGRES memory context definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: mcxt.h,v 1.14 1999/03/22 16:45:28 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef MCXT_H
#define MCXT_H
/* These types are declared in nodes/memnodes.h, but most users of memory
* allocation should just treat them as abstract types, so we do not provide
* the struct contents here.
*/
typedef struct MemoryContextData *MemoryContext;
typedef struct GlobalMemoryData *GlobalMemory;
extern DLLIMPORT MemoryContext CurrentMemoryContext;
extern MemoryContext TopMemoryContext;
/*
* MaxAllocSize
* 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.
*
* This value should not be referenced except in one place in the code.
*
* XXX This should be defined in a file of tunable constants.
*/
#define MaxAllocSize (0xfffffff) /* 16G - 1 */
/*
* prototypes for functions in mcxt.c
*/
extern void EnableMemoryContext(bool on);
extern Pointer MemoryContextAlloc(MemoryContext context, Size size);
extern Pointer MemoryContextRealloc(MemoryContext context,
Pointer pointer,
Size size);
extern void MemoryContextFree(MemoryContext context, Pointer pointer);
extern MemoryContext MemoryContextSwitchTo(MemoryContext context);
extern GlobalMemory CreateGlobalMemory(char *name);
extern void GlobalMemoryDestroy(GlobalMemory context);
#endif /* MCXT_H */
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