Go程序陷入死锁
这是我的Golang程序,我正在玩它,只是为了让我的概念正确。 当我运行程序时,它处于死锁状态,我不明白为什么? 请任何人指出哪里出了问题Go程序陷入死锁,go,goroutine,Go,Goroutine,这是我的Golang程序,我正在玩它,只是为了让我的概念正确。 当我运行程序时,它处于死锁状态,我不明白为什么? 请任何人指出哪里出了问题 package main import ( "fmt" "sync" ) var wg sync.WaitGroup func main() { numOfGoRoutines := 10 wg.Add(numOfGoRoutines) ch := make(chan int, numOfGoRoutines)
package main
import (
"fmt"
"sync"
)
var wg sync.WaitGroup
func main() {
numOfGoRoutines := 10
wg.Add(numOfGoRoutines)
ch := make(chan int, numOfGoRoutines)
for i := 0; i < numOfGoRoutines; i++ {
a := i
go sqr(ch, a, wg)
}
wg.Wait()
fmt.Println("After WAIT")
close(ch)
var res int
for i := range ch {
res += i
}
ch = nil
fmt.Println("result = ", res)
}
func sqr(ch chan int, val int, wg sync.WaitGroup) {
fmt.Println("go - ", val)
s := val * val
ch <- s
wg.Done()
}
问题是您正在将
sync.WaitGroup
的副本传递给goroutines,而不是引用(即指针):
啊,很难知道什么是ref类型,什么是value类型,但无论如何,谢谢。@Bovi_Khurja除了贴图、切片和通道之外,所有东西都是value类型。
warning: GOPATH set to GOROOT (C:\\Go) has no effect
go - 9
go - 0
go - 1
go - 2
go - 3
go - 4
go - 5
go - 6
go - 7
go - 8
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [semacquire]:
sync.runtime_Semacquire(0x5bcabc)
C:/Go/src/runtime/sema.go:47 +0x2d
sync.(*WaitGroup).Wait(0x5bcab0)
C:/Go/src/sync/waitgroup.go:127 +0xbb
main.main()
C:/demo/go-work/main.go:20 +0xdf
exit status 2
package main
import (
"fmt"
"sync"
)
var wg sync.WaitGroup
func main() {
numOfGoRoutines := 10
wg.Add(numOfGoRoutines)
ch := make(chan int, numOfGoRoutines)
for i := 0; i < numOfGoRoutines; i++ {
a := i
go sqr(ch, a, &wg)
}
wg.Wait()
fmt.Println("After WAIT")
close(ch)
var res int
for i := range ch {
res += i
}
ch = nil
fmt.Println("result = ", res)
}
func sqr(ch chan int, val int, wg *sync.WaitGroup) {
fmt.Println("go - ", val)
s := val * val
ch <- s
wg.Done()
}
package main
import (
"fmt"
"sync"
)
var wg sync.WaitGroup
func main() {
numOfGoRoutines := 10
wg.Add(numOfGoRoutines)
ch := make(chan int, numOfGoRoutines)
for i := 0; i < numOfGoRoutines; i++ {
a := i
go sqr(ch, a)
}
wg.Wait()
fmt.Println("After WAIT")
close(ch)
var res int
for i := range ch {
res += i
}
ch = nil
fmt.Println("result = ", res)
}
func sqr(ch chan int, val int) {
fmt.Println("go - ", val)
s := val * val
ch <- s
wg.Done()
}