快速解決Golang Map 并發(fā)讀寫安全的問題

package main
import (
	"fmt"
	"time"
)
var TestMap map[string]string
func init() {
	TestMap = make(map[string]string, 1)
}
func main() {
	for i := 0; i  1000; i++ {
		go Write("aaa")
		go Read("aaa")
		go Write("bbb")
		go Read("bbb")
	}
	time.Sleep(5 * time.Second)
}
func Read(key string) {
	fmt.Println(TestMap[key])
}
func Write(key string) {
	TestMap[key] = key
}

package main
import (
 "fmt"
 cmap "github.com/orcaman/concurrent-map"
 "time"
)
var TestMap cmap.ConcurrentMap
func init() {
 TestMap = cmap.New()
}
func main() {
 for i := 0; i  100; i++ {
 go Write("aaa", "111")
 go Read("aaa")
 go Write("bbb", "222")
 go Read("bbb")
 }
 time.Sleep(5 * time.Second)
}
func Read(key string) {
 if v, ok := TestMap.Get(key); ok {
 fmt.Printf("鍵值為 %s 的值為：%s", key, v)
 } else {
 fmt.Printf("鍵值不存在")
 }
}
func Write(key string, value string) {
 TestMap.Set(key, value)
}

package main 
import (
 "fmt"
)
var m = make(map[int]int)
func main() {
 //寫入操作
 i:=0
 go func() {
 for{
 i++
 m[1]=i
 }
 
 }()
 //讀操作
 go func() {
 for{
 fmt.Println(m[1])
 }
 
 }()
 //無限循環(huán)，讓并發(fā)程序在后臺運行
 for {
 ;
 }
}

The zero Map is empty and ready for use. A Map must not be copied after first use.
type Map struct {
 mu Mutex
 misses int
}
 
// Load returns the value stored in the map for a key, or nil if no
// value is present.
// The ok result indicates whether value was found in the map.
func (m *Map) Load(key interface{}) (value interface{}, ok bool) { 
}
 
// Store sets the value for a key.
func (m *Map) Store(key, value interface{}) {
 
}
// LoadOrStore returns the existing value for the key if present.
// Otherwise, it stores and returns the given value.
// The loaded result is true if the value was loaded, false if stored.
func (m *Map) LoadOrStore(key, value interface{}) (actual interface{}, loaded bool) { 
}
 
// Delete deletes the value for a key.
func (m *Map) Delete(key interface{}) { 
} 
 
// Range calls f sequentially for each key and value present in the map.
// If f returns false, range stops the iteration.
//
// Range does not necessarily correspond to any consistent snapshot of the Map's
// contents: no key will be visited more than once, but if the value for any key
// is stored or deleted concurrently, Range may reflect any mapping for that key
// from any point during the Range call.
//
// Range may be O(N) with the number of elements in the map even if f returns
// false after a constant number of calls.
func (m *Map) Range(f func(key, value interface{}) bool) { 
}
 
func (m *Map) missLocked() {
 
}
 
func (m *Map) dirtyLocked() {
 
}

package main 
import (
 "fmt"
 "sync"
 "time"
)
 
var m1 sync.Map 
func main() {
 i := 0
 go func() {
 for {
 i++
 m1.Store(1, i)
 time.Sleep(1000)
 }
 }()
 go func() {
 for{
 time.Sleep(1000)
 fmt.Println(m1.Load(1))
 }
 
 }()
 for {
 ;
 }
}