glang中sync.map包详解
2021/11/30 23:36:47
本文主要是介绍glang中sync.map包详解,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
type Map struct { mu Mutex // read contains the portion of the map's contents that are safe for // concurrent access (with or without mu held). // // The read field itself is always safe to load, but must only be stored with // mu held. // //read 包含可安全并发访问的映射内容部分(有或没有mu持有)。 //读取字段本身始终可以安全加载,但必须仅在保留mu 的情况下存储。 //存储在 read 中的条目可以在没有mu 的情况下同时更新,但更新先前删除的条目需要将条目复制到脏映射并 //在保留mu 的情况下取消删除。 read atomic.Value // readOnly // dirty contains the portion of the map's contents that require mu to be // held. To ensure that the dirty map can be promoted to the read map quickly, // it also includes all of the non-expunged entries in the read map. // // Expunged entries are not stored in the dirty map. An expunged entry in the // clean map must be unexpunged and added to the dirty map before a new value // can be stored to it. // // If the dirty map is nil, the next write to the map will initialize it by // making a shallow copy of the clean map, omitting stale entries. dirty map[interface{}]*entry // misses counts the number of loads since the read map was last updated that // needed to lock mu to determine whether the key was present. // // Once enough misses have occurred to cover the cost of copying the dirty // map, the dirty map will be promoted to the read map (in the unamended // state) and the next store to the map will make a new dirty copy. misses int }
sync.map是线程安全的
方法:
Load() => 设置值
Store() => 获取值
LoadOrStore() => LoadOrStore 返回键的现有值(如果存在)。 否则,它存储并返回给定的值。 如果值已加载,则加载结果为 true,如果已存储则为 false
LoadAndDelete() => LoadAndDelete 删除键的值,如果有,则返回先前的值。 加载的结果报告密钥是否存在
Delete() => 删除
Range() => 循环
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