veil_shmem.h File Reference

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Detailed Description

     Author:       Marc Munro
     Copyright (c) 2005, 2006 Marc Munro
     License:      BSD
 $Id: veil_shmem.h,v 1.2 2006/11/01 00:08:55 bloodnok Exp $

Define the basic veil shared memory structures

Definition in file veil_shmem.h.

#include "utils/hsearch.h"
#include "storage/lwlock.h"

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Data Structures
struct	MemChunk
	Chunks provide a linked list of dynamically allocated shared memory segments, with the most recently allocated chunk at the tail. More...
struct	MemContext
	MemContexts are large single chunks of shared memory from which smaller allocations may be made. More...
struct	Object
	General purpose object-type. More...
struct	ShmemCtl
	The ShmemCtl structure is the first object allocated from the first chunk of shared memory in context 0. More...
struct	Int4Var
	Subtype of Object for storing simple int4 values. More...
struct	Range
	Subtype of Object for storing range values. More...
struct	Bitmap
	Subtype of Object for storing bitmaps. More...
struct	BitmapRef
	Subtype of Object for storing bitmap refs. More...
struct	BitmapArray
	Subtype of Object for storing bitmap arrays. More...
struct	BitmapHash
	Subtype of Object for storing bitmap hashes. More...
struct	Int4Array
	Subtype of Object for storing arrays of integers. More...
struct	VarEntry
	A Veil variable. More...
struct	veil_variable_t
	Describes a veil shared or session variable. More...
Defines
#define	VEIL_DATATYPES   1
#define	CHUNK_SIZE   8192
	Chunks od shared memory are allocated in multiples of this size.
#define	MAX_ALLOWED_SHMEM   CHUNK_SIZE * 100
	Limits the total amount of memory available for veil shared variables.
#define	HASH_KEYLEN   60
	The key length for veil hash types.
Enumerations
enum	ObjType {   OBJ_UNDEFINED = 0, OBJ_SHMEMCTL, OBJ_INT4, OBJ_RANGE,   OBJ_BITMAP, OBJ_BITMAP_ARRAY, OBJ_BITMAP_HASH, OBJ_BITMAP_REF,   OBJ_INT4_ARRAY, OBJ_UNDEFINED = 0, OBJ_SHMEMCTL, OBJ_INT4,   OBJ_RANGE, OBJ_BITMAP, OBJ_BITMAP_ARRAY, OBJ_BITMAP_HASH,   OBJ_BITMAP_REF, OBJ_INT4_ARRAY }
	Describes the type of an Object record or one of its subtypes.

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