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Go语言atomic原子操作     所属分类 go 浏览量 102
go doc sync/atomic

import "sync/atomic"
func AddInt32(addr *int32, delta int32) (new int32)
func AddInt64(addr *int64, delta int64) (new int64)

func CompareAndSwapInt32(addr *int32, old, new int32) (swapped bool)
func CompareAndSwapInt64(addr *int64, old, new int64) (swapped bool)

func LoadInt32(addr *int32) (val int32)
func LoadInt64(addr *int64) (val int64)
func StoreInt32(addr *int32, val int32)
func StoreInt64(addr *int64, val int64)

Add  CompareAndSwap Load Store
读写 增加 比较和交换


var count int32
atomic.AddInt32(&count,1)


并发递增计数 count3.go package main import "fmt" import "time" import "sync" import "sync/atomic" var count int32 var NUM = 1000000 var GONUM = 100 var wg sync.WaitGroup func main() { wg.Add(GONUM) start := time.Now() for i := 0; i < GONUM; i++ { go countadd() } wg.Wait() cost := time.Since(start) fmt.Println(count,cost) } func countadd(){ defer wg.Done() for i := 0; i < NUM; i++ { atomic.AddInt32(&count,1) } }
go run count3.go 100000000 3.296716571s go run count3.go 100000000 3.185218237s
完整代码 https://gitee.com/dyyx/hellocode/blob/master/web/tech/go/demo/count3.go

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GO mutex 与 atomic 性能对比

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