var firstItemPtr *int8 = &userList[0] //2.转换成Pointer类型 ptr := unsafe.Pointer(firstItemPtr) //3.转换成uintptr类型,然后进行内存地址计算(即地址增加1个字节,意味着2个索引位置) targetAdress := uintptr(ptr) + 1 fmt.Println(targetAdress) //4.根据新地址重新转换成Pointer类型 newPtr :=...
1// 请求失败造成 panic2funcmain(){3resp,err:=http.Get("https://api.ipify.org?format=json")4defer resp.Body.Close()// resp 可能为 nil,不能读取 Body5iferr!=nil{6fmt.Println(err)7return8}910body,err:=ioutil.ReadAll(resp.Body)11checkError(err)1213fmt.Println(string(body))14}1516fu...
AI代码解释 // runtime/signal_unix.gofuncsighandler(sig uint32,info*siginfo,ctxt unsafe.Pointer,gp*g){...// SIGPROF信号的处理入口ifsig==_SIGPROF{if!delayedSignal&&validSIGPROF(mp,c){sigprof(c.sigpc(),c.sigsp(),c.siglr(),gp,mp)}return}} sigprof 首先会调用 gentraceback 得到当前协程...
s := []*int{new(int),new(int),new(int),new(int)}// do something with s ...// Reset pointer values.s[0], s[len(s)-1] =nil,nilreturns[1:3:3] } 2.4.goroutine泄漏 packagemainimport("fmt"_"net/http/pprof""time")funcmain(){ ch :=make(chanint)for{ time.Sleep(1* time....
=0{lock(&sched.lock)gp := globrunqget(_p_,0)unlock(&sched.lock)ifgp !=nil{returngp,false,false}}...// Spinning Ms: steal work from other Ps./// Limit the number of spinning Ms to half the number of busy Ps.// This is necessary to prevent...
= reflectlite.Ptr || val.IsNil() {panic("errors: target must be a non-nil pointer")}targetType := typ.Elem()iftargetType.Kind() != reflectlite.Interface && !targetType.Implements(errorType) {panic("errors: *target must be interface or implement error")}forerr !=nil{ifreflectlite.TypeOf...
{retryNext:oldnext:=_p_.runnextif!_p_.runnext.cas(oldnext,guintptr(unsafe.Pointer(gp))){gotoretryNext}// 如果 runnext 位置原本不存在 g 直接返回ifoldnext==0{return}// gp 指向 runnext 中被置换出来的 ggp=oldnext.ptr()}retry:// 获取 lrq 头节点的索引h:=atomic.LoadAcq(&_p_.runq...
Pointer // 桶指针,灵魂字段. oldbuckets unsafe.Pointer // 迁移前的桶指针(迁移过程中有值,未迁移时为nil) nevacuate uintptr // 迁移进度,小于这个值的桶序号一定是完成迁移的 extra *mapextra // 扩展字段 } type mapextra struct { // If both key and elem do not contain pointers and are ...
runtime error: invalid memory address or nil pointer dereferenc 翻译:运行时错误:无效的内存地址或 nil 指针取消引用 很明显,这句话说明了在定义了一个指针类型后,没有对该值进行初始化而是直接运用,就会报这个错误 解决 在数据库连接时候,定义了一个指针变量,但是未赋值而是直接使用了 ...
(pBuf *C.uchar, RevLen C.uint) int { var buf []byte data := (*reflect.SliceHeader)(unsafe.Pointer(&buf)) data.Data = uintptr(unsafe.Pointer(pBuf)) data.Len = int(RevLen) data.Cap = int(RevLen) logger.Printf("## export_fetchWithErr@:this is callback result:%v", string(buf...