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102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* memnodes.h--
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* POSTGRES memory context node definitions.
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: memnodes.h,v 1.7 1997/09/08 21:52:44 momjian Exp $
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*
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* XXX the typedefs in this file are different from the other ???nodes.h;
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* they are pointers to structures instead of the structures themselves.
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* If you're wondering, this is plain laziness. I don't want to touch
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* the memory context code which should be revamped altogether some day.
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* - ay 10/94
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*-------------------------------------------------------------------------
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*/
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#ifndef MEMNODES_H
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#define MEMNODES_H
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#include <lib/fstack.h>
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#include <utils/memutils.h>
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#include <nodes/nodes.h>
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/*
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* MemoryContext --
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* A logical context in which memory allocations occur.
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*
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* The types of memory contexts can be thought of as members of the
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* following inheritance hierarchy with properties summarized below.
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*
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* Node
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* |
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* MemoryContext___
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* / \
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* GlobalMemory PortalMemoryContext
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* / \
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* PortalVariableMemory PortalHeapMemory
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*
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* Flushed at Flushed at Checkpoints
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* Transaction Portal
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* Commit Close
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*
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* GlobalMemory n n n
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* PortalVariableMemory n y n
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* PortalHeapMemory y y y
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*/
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typedef struct MemoryContextMethodsData
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{
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Pointer (*alloc) ();
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void (*free_p) (); /* need to use free as a #define, so can't
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* use free */
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Pointer (*realloc) ();
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char *(*getName) ();
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void (*dump) ();
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} *MemoryContextMethods;
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typedef struct MemoryContext
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{
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NodeTag type;
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MemoryContextMethods method;
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} *MemoryContext;
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/* think about doing this right some time but we'll have explicit fields
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for now -ay 10/94 */
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typedef struct GlobalMemory
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{
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NodeTag type;
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MemoryContextMethods method;
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AllocSetData setData;
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char *name;
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OrderedElemData elemData;
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} *GlobalMemory;
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typedef MemoryContext *PortalMemoryContext;
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typedef struct PortalVariableMemory
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{
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NodeTag type;
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MemoryContextMethods method;
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AllocSetData setData;
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} *PortalVariableMemory;
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typedef struct PortalHeapMemory
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{
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NodeTag type;
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MemoryContextMethods method;
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Pointer block;
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FixedStackData stackData;
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} *PortalHeapMemory;
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/*
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* MemoryContextIsValid --
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* True iff memory context is valid.
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*/
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#define MemoryContextIsValid(context) \
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(IsA(context,MemoryContext) || IsA(context,GlobalMemory) || \
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IsA(context,PortalVariableMemory) || IsA(context,PortalHeapMemory))
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#endif /* MEMNODES_H */
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