我正在尝试调试一个简单的golang程序,但是不知道如何在delve调试器中的特定goroutine上设置断点。
这是一个例子:
package main
import "fmt"
func adder(a int, b int, res_chan chan int) {
c := a + b
res_chan <- c
}
func main() {
chan1 := make(chan int)
chan2 := make(chan int)
go adder(0, 1, chan1)
go adder(0, 2, chan2)
res1 := <-chan1
res2 := <-chan2
fmt.Printf("Channel 1: %d\nChannel 2: %d\n", res1, res2)
}
我做dlv debug
:
Type 'help' for list of commands.
在goroutine上设置一个断点,在这里我很直观地认为调试器将停止两次(在每个调用的goroutine上):
(dlv) b main.adder
Breakpoint 1 set at 0x49dd1f for main.adder() ./adder.go:5
(dlv) c
> main.adder() ./adder.go:5 (hits goroutine(18):1 total:2) (PC: 0x49dd1f)
> main.adder() ./adder.go:5 (hits goroutine(19):1 total:2) (PC: 0x49dd1f)
1: package main
2:
3: import "fmt"
4:
=> 5: func adder(a int, b int, res_chan chan int) {
6: c := a + b
7: res_chan <- c
8: }
9:
10: func main() {
(dlv) s
> main.adder() ./adder.go:6 (PC: 0x49dd2d)
1: package main
2:
3: import "fmt"
4:
5: func adder(a int, b int, res_chan chan int) {
=> 6: c := a + b
7: res_chan <- c
8: }
9:
10: func main() {
11: chan1 := make(chan int)
(dlv)
> main.adder() ./adder.go:7 (PC: 0x49dd3c)
2:
3: import "fmt"
4:
5: func adder(a int, b int, res_chan chan int) {
6: c := a + b
=> 7: res_chan <- c
8: }
9:
10: func main() {
11: chan1 := make(chan int)
12: chan2 := make(chan int)
检查c
变量的值:
(dlv) p c
2
继续执行:
(dlv) c
Channel 1: 1
Channel 2: 2
Process 8112 has exited with status 0
退出调试器:
(dlv) q
Process 8112 has exited with status 0
因此,结果为1
的goroutine未被调试器击中。
如何在goroutine结果1
中调试代码执行?
答案 0 :(得分:3)
我在条件上使用了断点:
运行dlv debug
:
Type 'help' for list of commands.
在一行上设置一个断点,可以在某种情况下确定goroutine。在7
行中,变量c
已被求值,因此我们可以在其上建立条件。
在第7行设置一个断点:
(dlv) b adder.go:7
Breakpoint 1 set at 0x49dd3c for main.adder() ./adder.go:7
列出所有断点以提高清晰度:
(dlv) breakpoints
Breakpoint unrecovered-panic at 0x42a870 for runtime.startpanic() /home/dmytriv/.soft/go/src/runtime/panic.go:591 (0)
print runtime.curg._panic.arg
Breakpoint 1 at 0x49dd3c for main.adder() ./adder.go:7 (0)
设置断点1
的条件:
(dlv) cond 1 c == 1
继续执行:
(dlv) c
在此处遇到断点:
> main.adder() ./adder.go:7 (hits goroutine(5):1 total:1) (PC: 0x49dd3c)
2:
3: import "fmt"
4:
5: func adder(a int, b int, res_chan chan int) {
6: c := a + b
=> 7: res_chan <- c
8: }
9:
10: func main() {
11: chan1 := make(chan int)
12: chan2 := make(chan int)
检查c
变量的值:
(dlv) p c
1
继续:
(dlv) c
Channel 1: 1
Channel 2: 2
Process 10096 has exited with status 0
退出调试器:
(dlv) q
Process 10096 has exited with status 0