Thanks for your reply, but I still don't understand why time.Sleep is causing my test program to panic.
In fact, this is a real online environment problem. My application uses http.Client.Do(), but it occasionally has errors: [lookup xxxxx on xxxxx: dial udp xxxxx: operation was canceled], after looking at the code, I found that it may be There is a problem with ForgetUnshared, lookupIPAddr uses ForgetUnshared: https://github.com/golang/go/blob/4a4127bccc826ebb6079af3252bc6bfeaec187c4/src/net/lookup.go#L336 在2022年9月21日星期三 UTC+8 16:17:35<cuong.m...@gmail.com> 写道： > Hello, > > You use time.Sleep in your program, so the behavior is not predictable. In > fact, I get it success or panic randomly. > > You can see https://go-review.googlesource.com/c/sync/+/424114 to see a > predictable test of ForgetUnshared . > > On Wednesday, September 21, 2022 at 1:45:24 PM UTC+7 atomic wrote: > >> hello >> >> I find that the `src/internal/singleflight/singleflight.go >> ForgetUnshared()` method returns results that are not always expected >> >> For this I wrote a test code, I copied the code in the >> src/internal/singleflight/singleflight.go file to the main package, and >> wrote a main function to test it, if ForgetUnshared() returns correctly, >> this code It should not panic, but the fact that it will panic every time >> it runs, is there something wrong with my understanding of ForgetUnshared()? >> >> The test code cannot be run in goplay, so I posted a link: >> https://gist.github.com/dchaofei/e07547bce17d94c3e05b1b2a7230f62f >> >> The go version I use for testing is 1.16, 1.19.1 >> >> result: >> ``` >> $ go run cmd/main.go >> panic: callUUID=[9314284969 <(931)%20428-4969>] err=[context canceled] >> currentUUId=[6980556786] >> ``` >> > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/866a2e1c-4feb-4777-9978-e5d1b50663efn%40googlegroups.com.
