因为go语言中的runtime环境是有自己的堆栈和goroutine,recovery函数也是在runtime环境执行的,所以要调度到m->g0来执行recovery函数,我们在看一下recovery函数: // Unwind the stack after a deferred function calls recover // after a panic. Then arrange to continue running as though // the caller of the...
Recover is a built-in function that regains control of a panicking goroutine. Recover is only useful inside deferred functions. During normal execution, a call to recover will return nil and have no other effect. If the current goroutine is panicking, a call to recover will capture the valu...
goroutine 3 [running]: main.f(0x0) /go/blog-go-example/error/defer-panic-recover/panic/main.go:25 +0xa0 created by main.g in goroutine 1 /go/blog-go-example/error/defer-panic-recover/panic/main.go:19 +0x5c exit status 2 panic 和 os.Exit 虽然panic和os.Exit都能使程序终止并退出,...
$ go run main.go calling g called g panicking! panic: i=0 goroutine 3 [running]: main.f(0x0) /go/blog-go-example/error/defer-panic-recover/panic/main.go:25 +0xa0 created by main.g in goroutine 1 /go/blog-go-example/error/defer-panic-recover/panic/main.go:19 +0x5c exit statu...
// function which calls defer. func deferreturn() 看到deferreturn函数的注释,基本也就明白了Go语言如何保证在函数返回时执行当前函数内声明的defer。在编译阶段,如果检测到当前函数声明了defer,则会在函数末尾添加deferreturn函数调用,该函数遍历当前函数声明的defer并执行: ...
panic,recover 和 Go 协程 运行时 panic 恢复后获得堆栈跟踪 回到顶部 什么是 panic 在Go 语言中,程序中一般是使用[错误]来处理异常情况。对于程序中出现的大部分异常情况,错误就已经够用了。 但在有些情况,当程序发生异常时,无法继续运行。在这种情况下,我们会使用panic来终止程序。当[函数]发生 panic 时,它会...
// The panic built-in function stops normal execution of the current // goroutine. When a function F calls panic, normal execution of F stops // immediately. Any functions whose execution was deferred by F are run in // the usual way, and then F returns to its caller. To the caller...
// functions in the executing goroutine have stopped, in reverse order. At // that point, the program is terminated with a non-zero exit code. This // termination sequence is called panicking and can be controlled by the // built-in function recover. ...
func recoveryFunction() { fmt.Println("This is recovery function...") } func executePanic() { defer recoveryFunction() panic("This is Panic Situation") fmt.Println("The function executes Completely") } func main() { executePanic()
deferred function it will// not stop a panicking sequence. In this case, or when the goroutine is not// panicking, or if the argument supplied to panic was nil, recover returns// nil. Thus the return value from recover reports whether the goroutine is// panicking.funcrecover()interface{...