Hang on Arch Linux #6
Comments
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Hmm. I actually developed and tested it on Arch Linux 64-bit using that webkitgtk package, so I'm not sure what the issue is. Do you have any clues as to what it's waiting for? |
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After some research, it looks like it's getting stuck on line 48 of webloop.go. Looking further into it now. |
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Alright, so I haven't played too much with channels, but I think it's waiting for the view channel to finish executing before returning, but it never finishes. Any ideas what might be causing this? |
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Hmm. Do you have |
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Yeah, |
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Do other GTK programs, or other WebKit2 programs, such as webkit-eval-js or the tests in https://github.com/sourcegraph/go-webkit2, run for you? |
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The tests in go-webkit2 seem to pass. |
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What if you set up printlns or breakpoints in the various blocks in https://github.com/sourcegraph/webloop/blob/master/webloop.go#L25-L45? What, if anything, gets executed? And are there other goroutines blocking anything else (perhaps another goroutine is blocking the IdleAdd fn from running?)? Thanks for your patience 😃 |
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I was playing around with that earlier. Nothing in the passed function is executed. Could this be an issue with glib? |
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It could be, but I'm inclined to blame my code here (since other glib consumers seem to work). |
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Hmm, how can I check if other goroutines are blocking anything else? |
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Run it in gdb and then ctrl-C while it's hanging, or periodically call and print http://golang.org/pkg/runtime/#Stack (there are libs that do this for you but I forget which ones right now). |
I really appreciate you going out of your way to get this resolved :-). |
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Happy to help! 😄 When you hit ctrl-C and get to the |
Sorry, not too familiar with gdb. |
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Hmm, I am a bit fuzzy too, but I think I was wrong...these are just the On Mon, Dec 9, 2013 at 2:02 PM, Zach Latta [email protected] wrote:
Quinn Slack |
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Hmm, that's really strange. It's not doing anything. It's as though GTK On Mon, Dec 9, 2013 at 2:23 PM, Zach Latta [email protected] wrote:
Quinn Slack |
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Alright, thanks! I'll definitely let you know if I find out any more info. |
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I experience the same behaviour on Ubuntu 13.10 saucy, trying to run the headless example. The program silently fails, or rather it looks like line 11 blocks: view := ctx.NewView() |
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I fixed the example code: package main
import (
"fmt"
"os"
"runtime"
"github.com/conformal/gotk3/gtk"
"github.com/sourcegraph/webloop"
)
func main() {
gtk.Init(nil)
go func() {
runtime.LockOSThread()
gtk.Main()
}()
ctx := webloop.New()
view := ctx.NewView()
defer view.Close()
view.Open("http://google.com")
err := view.Wait()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to load URL: %s", err)
os.Exit(1)
}
res, err := view.EvaluateJavaScript("document.title")
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to run JavaScript: %s", err)
os.Exit(1)
}
fmt.Printf("JavaScript returned: %q\n", res)
} |
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I can confirm this hang on Ubuntu 14.04. The improved example from @pakohan fixed it. I suggest updating the example in the README. |
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Thanks! I updated it in example_test.go and in the readme in d990ee2. I actually haven't tried it myself (I'm on a plane right now on a Mac), but 2 people saying it works is good enough for me to update it for now. |
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I'm also on a mac and did not get it running here. I set up a docker image for this if you are interested: https://registry.hub.docker.com/u/rverton/golang-webkit/ |
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Did any one encountered similar issue with https://github.com/sourcegraph/webloop#rendering-static-html-from-a-dynamic-single-page-angularjs-app ? |
The headless example program in the README silently hangs on Arch Linux 64bit.
Repro steps:
System dump: https://gist.github.com/zachlatta/2fe43a3044c5dfbdb8dd
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