obj

Documentation

Overview

Package obj atomically installs objects from modified buffers in their corresponding disk blocks and writes the blocks to the write-ahead log. The upper layers are responsible for locking and lock ordering.

Index

• type Log
  • func MkLog(d disk.Disk) *Log
  • func (l *Log) CommitWait(bufs []*buf.Buf, wait bool) bool
  • func (l *Log) Flush() bool
  • func (l *Log) Load(addr addr.Addr, sz uint64) *buf.Buf
  • func (l *Log) LogSz() uint64
  • func (l *Log) Shutdown()

Types

type Log

type Log struct {
	// contains filtered or unexported fields
}

Log mediates access to object loading and installation.

There is only one Log object.

func MkLog

func MkLog(d disk.Disk) *Log

MkLog recovers the object logging system (or initializes from an all-zero disk).

func (*Log) CommitWait

func (l *Log) CommitWait(bufs []*buf.Buf, wait bool) bool

Commit dirty bufs of the transaction into the log, and perhaps wait.

func (*Log) Flush

func (l *Log) Flush() bool

NOTE: this is coarse-grained and unattached to the transaction ID

func (*Log) Load

func (l *Log) Load(addr addr.Addr, sz uint64) *buf.Buf

Read a disk object into buf

func (*Log) LogSz

func (l *Log) LogSz() uint64

LogSz returns 511 (the size of the wal log)

func (*Log) Shutdown

func (l *Log) Shutdown()