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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc to all files copyright Regents of Berkeley. Man, that's a lot of files.
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* mcxt.h
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* POSTGRES memory context definitions.
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*
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*
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: mcxt.h,v 1.16 2000/01/26 05:58:38 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef MCXT_H
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#define MCXT_H
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/* These types are declared in nodes/memnodes.h, but most users of memory
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* allocation should just treat them as abstract types, so we do not provide
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* the struct contents here.
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*/
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typedef struct MemoryContextData *MemoryContext;
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typedef struct GlobalMemoryData *GlobalMemory;
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extern DLLIMPORT MemoryContext CurrentMemoryContext;
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extern MemoryContext TopMemoryContext;
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/*
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* MaxAllocSize
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* Arbitrary limit on size of allocations.
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*
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* Note:
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* There is no guarantee that allocations smaller than MaxAllocSize
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* will succeed. Allocation requests larger than MaxAllocSize will
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* be summarily denied.
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*
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* This value should not be referenced except in one place in the code.
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*
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* XXX This should be defined in a file of tunable constants.
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*/
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#define MaxAllocSize (0xfffffff) /* 16G - 1 */
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/*
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* prototypes for functions in mcxt.c
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*/
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extern void EnableMemoryContext(bool on);
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extern Pointer MemoryContextAlloc(MemoryContext context, Size size);
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extern Pointer MemoryContextRealloc(MemoryContext context,
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Pointer pointer,
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Size size);
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extern void MemoryContextFree(MemoryContext context, Pointer pointer);
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extern MemoryContext MemoryContextSwitchTo(MemoryContext context);
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extern GlobalMemory CreateGlobalMemory(char *name);
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extern void GlobalMemoryDestroy(GlobalMemory context);
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#endif /* MCXT_H */
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