type lockedWriteSyncer struct { sync.Mutex ws WriteSyncer } func Lock(ws WriteSyncer) WriteSyncer { if _, ok := ws.(*lockedWriteSyncer); ok { // no need to layer on another lock return ws } return &lockedWriteSyncer{ws: ws} } func (s *lockedWriteSyncer) Write(bs []byte) (int...
Copy Struct to Slice funcmain() {user:=User{Name:"Jinzhu",Age:18,Role:"Admin"}varemployees[]Employeecopier.Copy(&employees,&user)fmt.Printf("%#v\n",employees)// Output: []Employee{{Name: "Jinzhu", Age: 18, DoubleAge: 36, SuperRole: "Super Admin"}}} ...
type Element struct { // Next and previous pointers in the doubly-linked list of elements. // To simplify the implementation, internally a list l is implemented // as a ring, such that &l.root is both the next element of the last // list element (l.Back()) and the previous element...
// 互斥锁。// 零值mutex是未上锁状态(不需要初始化锁)// 初始化有利于静态锁定级 但是不是必须的type mutex struct{// 如果禁用了锁定级则为空结构体否则包括锁定等级lockRankStruct// 基于futex的实现将其看作uint32的key,// 而基于sema的实现将其看作M* waitm// 过去曾经是一个union,但是unions破坏了精...
单向只能接收:<-chan struct{} 只能从chan里接收struct (箭头远离channel,则代表接收) 双向即可发送也可接收:chan string 既能接收也能发送 nil是channel的零值,对值是nil的channel发送和接收总是会阻塞 回到顶部 二.channel 底层实现 1.channel底层结构
int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout); 第二个参数:就绪事件列表,是需要在用户空间分配内存然后再传给 epoll_wait 的,如果内核会用 mmap 设置共享内存,直接传递一个指针进去就行了,根本不需要在用户态分配内存,多此一举。其次,内核和用户进程通过 mmap 共享内...
deep copy a struct variable to another one getClipText get clipboard text setClipText set clipboard text trim trim a string run execute a script file(in a new created VM) run(argsA...) runCode execute a script string(in a new created VM, argsG will hold the arguments) ...
type hiter struct { // 指向遍历的 key 的指针 key unsafe.Pointer // Must be in first position. Write nil to indicate iteration end (see cmd/compile/internal/walk/range.go). // 指向遍历的 value 的指针 elem unsafe.Pointer // Must be in second position (see cmd/compile/internal/walk/rang...
Another definition of systems programming is the stuff that runs in the cloud.--Rob Pike今天我探索了一下 golang 的两个方面:类似于 Java 中有很好的 Builder 模式 Getter 和 Setter 的命名约定然后我发现了函数选项(Functional Options)模式, GIST上有一个最小的例子。 函数选项模式是由Rob Pike提出,并...
sflags - Struct based flags generator for flag, urfave/cli, pflag, cobra, kingpin, and other libraries. strumt - Library to create prompt chain. subcmd - Another approach to parsing and running subcommands. Works alongside the standard flag package. teris-io/cli - Simple and complete API ...