fbuffer

Documentation

Overview

Copyright (C) BABEC. All rights reserved. Copyright (C) THL A29 Limited, a Tencent company. All rights reserved.

SPDX-License-Identifier: Apache-2.0

Copyright (C) THL A29 Limited, a Tencent company. All rights reserved.

SPDX-License-Identifier: Apache-2.0

Copyright (C) THL A29 Limited, a Tencent company. All rights reserved.

SPDX-License-Identifier: Apache-2.0

Index

• Variables
• func NewFixedBuffer(f *file.File, bufSize int) (*fixedbuffer, error)
• type ZeroMmap
  • func NewZeroMmap(f *file.File, mmSize int, mapPort, mapFlag int, lock bool) (*ZeroMmap, error)
  • func (zm *ZeroMmap) Close() error
  • func (zm *ZeroMmap) NextAt(offset int64, n int) ([]byte, error)
  • func (zm *ZeroMmap) ReadAt(offset int64, n int) ([]byte, error)
  • func (zm *ZeroMmap) Size() int64
  • func (zm *ZeroMmap) Sync() error
  • func (zm *ZeroMmap) Truncate(size int64) error
  • func (zm *ZeroMmap) WriteBack() error

Variables

var (
	OsPageSize = os.Getpagesize()
)

Functions

func NewFixedBuffer

func NewFixedBuffer(f *file.File, bufSize int) (*fixedbuffer, error)

Types

type ZeroMmap

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

concurrent operations are unsafe

func NewZeroMmap

func NewZeroMmap(f *file.File, mmSize int, mapPort, mapFlag int, lock bool) (*ZeroMmap, error)

func (*ZeroMmap) Close

func (zm *ZeroMmap) Close() error

Close 释放分配器

func (*ZeroMmap) NextAt

func (zm *ZeroMmap) NextAt(offset int64, n int) ([]byte, error)

NextAt 从offset处获取n个字节，如果参数合法，则获取到bytes长度一定为n, offset可以比当前文件的size大，获取的bytes用于写入数据

func (*ZeroMmap) ReadAt

func (zm *ZeroMmap) ReadAt(offset int64, n int) ([]byte, error)

ReadAt 从offset处读取n个字节，除非读到文件末尾，否则读取到的长度一定为n, 其主要用来读取文件的内容

func (*ZeroMmap) Size

func (zm *ZeroMmap) Size() int64

func (*ZeroMmap) Sync

func (zm *ZeroMmap) Sync() error

Sync 将映射区的数据刷新到磁盘

func (*ZeroMmap) Truncate

func (zm *ZeroMmap) Truncate(size int64) error

Truncate 同步文件的大小，一般对文件进行Truncate的时候，同步调用buffer.Truncate,fSize防止从映射区中读取的数据超出文件大小

func (*ZeroMmap) WriteBack

func (zm *ZeroMmap) WriteBack() error