Segment Class Reference

This class contains information about a storage segment on disk. More...

#include <segment.h>

Collaboration diagram for Segment:

[legend]List of all members.

Public Member Functions
void	init (unsigned first_block, unsigned index)
void	alloc_buffers (Size segment_size_without_header)
void	free_buffers ()
void	print ()
Public Attributes
Segment_header *	header
void *	buffer
unsigned	first_block
unsigned	curr_page_block
Size	pages_count
unsigned	index

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Detailed Description

This class contains information about a storage segment on disk.

The disk is divided up into a series of fixed-size segments, and each segment contains several data pages. A Segment object in memory provides information about a single storage segment on disk. It contains a copy of the segment's header and a buffer containing its page data.

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Member Function Documentation

void Segment::alloc_buffers (  Size  segment_size_without_header  )

Allocate the header and data buffers in memory for this segment.

void Segment::free_buffers (   )

Free any buffers used by this segment.

void Segment::init (  unsigned  first_block, unsigned  index )

Initialize this segment in memory.

void Segment::print (   )

Print basic information about this segment.

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Member Data Documentation

void* Segment::buffer

contains the segment's page data

unsigned Segment::curr_page_block

disk block of current page

unsigned Segment::first_block

block number of segment on disk

Segment_header* Segment::header

copy of segment's metadata

unsigned Segment::index

0th segment is 0, 1st segment is 1

Size Segment::pages_count

number of pages stored in segment

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The documentation for this class was generated from the following files:

• segment.h
• segment.cc

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Torsion Operating System, Copyright (C) 2000-2004 Dan Helfman