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Redis源码分析--- bio后台I/O服务的实现

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在Redis系统中也存在后端服务的概念,在这种情况下被称为background Service。 Redis系统的后端线程在其运行过程中主要表现出I/O级联特性,在此基础上采用背景线程技术能够显著提升系统的执行效率。 在Linux内核源码库中包含了一系列与该功能相关的实现细节,请允许我借此机会分享一些学习心得: 我们先探讨一下Redis中的后端作业模式及其运行机制;

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 /* Background I/O service for Redis.

    
  * * 后台I/O服务
    
  * This file implements operations that we need to perform in the background.
    
  * Currently there is only a single operation, that is a background close(2)
    
  * system call. This is needed as when the process is the last owner of a
    
  * reference to a file closing it means unlinking it, and the deletion of the
    
  * file is slow

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