panic()如果在本协程里没有recover捕获，则会异常终止程序
在本协程里没有recover，在别的协程中recover是捕获不到的
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package main
import (
"fmt"
"time"
)
func main() {
defer func() { // 捕获不到
if r := recover(); r != nil {
fmt.Println("Recovered in main", r)
}
}()
go func() {
defer func() { // 能捕获到
if r := recover(); r != nil {
fmt.Println("Recovered in f", r)
}
}()
panic("hello world")
}()
time.Sleep(3 * time.Second)
}
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os.Exit()会立刻按退出码来终止程序，不会执行defer
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package main
import (
"fmt"
"os"
"time"
)
func main() {
defer func() { // 捕获不到
if r := recover(); r != nil {
fmt.Println("Recovered in main", r)
}
}()
go func() {
defer func() { // 能捕获到
if r := recover(); r != nil {
fmt.Println("Recovered in f", r)
}
}()
os.Exit(1)
}()
time.Sleep(3 * time.Second)
}
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log.Fatal() 就是先打印日志，然后执行os.Exit(1)
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package main
import (
"fmt"
"log"
"time"
)
func main() {
defer func() { // 捕获不到
if r := recover(); r != nil {
fmt.Println("Recovered in main", r)
}
}()
go func() {
defer func() { // 能捕获到
if r := recover(); r != nil {
fmt.Println("Recovered in f", r)
}
}()
log.Fatal("haha")
}()
time.Sleep(3 * time.Second)
}
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runtime.Goexit() 没有入参，他会立刻退出当前协程，会执行defer，但没有错误可被recover捕获
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package main
import (
"fmt"
"runtime"
"time"
)
func main() {
defer func() { // 捕获不到
if r := recover(); r != nil {
fmt.Println("Recovered in main", r)
}
}()
go func() {
defer func() { // 能捕获到
if r := recover(); r != nil {
fmt.Println("Recovered in f", r)
}
}()
runtime.Goexit()
fmt.Println("Hello World")
}()
time.Sleep(3 * time.Second)
}
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