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package unsafe_test
import (
"fmt"
"sync"
"sync/atomic"
"testing"
"time"
"unsafe"
)
type Customer struct {
Name string
Age int
}
func TestUnsafe(t *testing.T) {
i := 10
f := *(*float64)(unsafe.Pointer(&i))
t.Log(unsafe.Pointer(&i))
t.Log(f)
}
// The cases is suitable for unsafe
type MyInt int
//合理的类型转换
func TestConvert(t *testing.T) {
a := []int{1, 2, 3, 4}
b := *(*[]MyInt)(unsafe.Pointer(&a))
t.Log(b)
}
//原子类型操作
func TestAtomic(t *testing.T) {
var shareBufPtr unsafe.Pointer
writeDataFn := func() {
data := []int{}
for i := 0; i < 100; i++ {
data = append(data, i)
}
atomic.StorePointer(&shareBufPtr, unsafe.Pointer(&data))
}
readDataFn := func() {
data := atomic.LoadPointer(&shareBufPtr)
fmt.Println(data, *(*[]int)(data))
}
var wg sync.WaitGroup
writeDataFn()
for i := 0; i < 10; i++ {
wg.Add(1)
go func() {
for i := 0; i < 10; i++ {
writeDataFn()
time.Sleep(time.Microsecond * 100)
}
wg.Done()
}()
wg.Add(1)
go func() {
for i := 0; i < 10; i++ {
readDataFn()
time.Sleep(time.Microsecond * 100)
}
wg.Done()
}()
}
wg.Wait()
}
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