go map 源码
golang map 代码
文件路径：/src/runtime/testdata/testprog/map.go
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import "runtime"
func init() {
register("concurrentMapWrites", concurrentMapWrites)
register("concurrentMapReadWrite", concurrentMapReadWrite)
register("concurrentMapIterateWrite", concurrentMapIterateWrite)
}
func concurrentMapWrites() {
m := map[int]int{}
c := make(chan struct{})
go func() {
for i := 0; i < 10000; i++ {
m[5] = 0
runtime.Gosched()
}
c <- struct{}{}
}()
go func() {
for i := 0; i < 10000; i++ {
m[6] = 0
runtime.Gosched()
}
c <- struct{}{}
}()
<-c
<-c
}
func concurrentMapReadWrite() {
m := map[int]int{}
c := make(chan struct{})
go func() {
for i := 0; i < 10000; i++ {
m[5] = 0
runtime.Gosched()
}
c <- struct{}{}
}()
go func() {
for i := 0; i < 10000; i++ {
_ = m[6]
runtime.Gosched()
}
c <- struct{}{}
}()
<-c
<-c
}
func concurrentMapIterateWrite() {
m := map[int]int{}
c := make(chan struct{})
go func() {
for i := 0; i < 10000; i++ {
m[5] = 0
runtime.Gosched()
}
c <- struct{}{}
}()
go func() {
for i := 0; i < 10000; i++ {
for range m {
}
runtime.Gosched()
}
c <- struct{}{}
}()
<-c
<-c
}
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