Taffybar hangs on FUTEX_WAIT_PRIVATE

[NickHu]

Often Taffybar hangs, appearing not to launch. Recently I made the switch to TaffyPager, and afterwards I began to experience this behaviour. The full strace is below

strace taffybar

http://puu.sh/3NOOW.txt

[travitch]

Interesting. Are you running Linux? Can you attach your config?

[NickHu]

Yes, and yes:

uname -r
3.10.3-1-ARCH

import System.Taffybar
import System.Taffybar.Systray
import System.Taffybar.TaffyPager
import System.Taffybar.Pager (colorize, escape, shorten, wrap)
import System.Taffybar.SimpleClock
import System.Taffybar.MPRIS2
import System.Taffybar.FreedesktopNotifications
import System.Taffybar.Weather
import System.Taffybar.NetMonitor
import System.Taffybar.Battery

import Solarized

space = " "

main = do
  let weatherCfg = (defaultWeatherConfig "EGBE") { weatherTemplate = colorize solarizedViolet "" "Coventry Airport" ++ colorize solarizedBlue "" ":" ++ space ++ colorize solarizedGreen "" "$tempC$" ++ colorize solarizedBlue "" "°C" ++ space ++ colorize solarizedViolet "" "@" ++ space ++ colorize solarizedMagenta "" "$humidity$" ++ colorize solarizedBlue "" "%" ++ space ++ colorize solarizedRed "" "$skyCondition$" }
      clock = textClockNew Nothing (colorize solarizedViolet "" "%a" ++ space ++ colorize solarizedBlue "" "%b" ++ space ++ colorize solarizedCyan "" "%_d" ++ space ++ colorize solarizedYellow "" "%H" ++ colorize solarizedViolet "" ":" ++ colorize solarizedYellow "" "%M" ++ colorize solarizedViolet "" ":" ++ colorize solarizedYellow "" "%S") 1
      pager = taffyPagerNew defaultPagerConfig
        { activeWindow = colorize solarizedBlue "" . escape . shorten 128
        , activeLayout = colorize solarizedViolet "" . escape
        , activeWorkspace = colorize solarizedMagenta "" . escape
        , hiddenWorkspace = colorize solarizedBase01 "" . escape
        , emptyWorkspace = colorize solarizedBase00 "" . escape
        , visibleWorkspace = colorize solarizedGreen "" . escape
        , urgentWorkspace = colorize solarizedOrange "" . wrap "!" "!" . escape
        , widgetSep = colorize solarizedCyan "" " | "
        }
      tray = systrayNew
      nowPlaying = mpris2New
      notifications = notifyAreaNew defaultNotificationConfig
      net = netMonitorNew 1 "wlp3s0"
      weather = weatherNew weatherCfg 10
      battery = textBatteryNew (colorize solarizedRed "" "%d" ++ colorize solarizedBlue "" "%%") 5
  defaultTaffybar defaultTaffybarConfig { 
    monitorNumber = 0
  , barHeight = 16
  , startWidgets = [ pager ]
  , endWidgets = [ clock, battery, weather, tray, net, nowPlaying, notifications ]
  }

[NickHu]

I think this may be related to issue #43

[travitch]

Just to try to get a better handle on this issue: you are using dynamic workspaces as well, as in #43?

If so, are you adding (or, I suspect, removing) workspaces when this hang occurs? I can think up a scenario where removing one of the initial workspaces might cause a hang. That said, I don't know off-hand how the internals of taffypager work.

[NickHu]

I am using dynamic workspaces, but this hang actually seems to occur during initialization. Infact, I can't even get taffybar to appear anymore, and I haven't changed my xmonad.hs at all.

[NickHu]

I no longer believe this to be an issue with TaffyPager, as I've since switched back to the standard DBus XMonadLog method, and this still occurs. Infact, I don't even think it's a hang, I think it's an issue of XMonad not making room for Taffybar. My config can be found at https://www.github.com/NickHu/dotxmonad - It's broken at the latest commit.

[NickHu]

Infact, I can't get any commit to work properly. I'm starting to think this might be an XMonad darcs issue... I'll recompile, but @travitch could you please confirm that it works on your end?

EDIT: The example taffybar configs work fine.

[NickHu]

I found the issue, it was with the battery component. It seems that UPower for me was broken by a recent update. Taffybar could die or otherwise act more gracefully, perhaps spew out an error rather than wait eternally though.
Follow up here: https://bbs.archlinux.org/viewtopic.php?pid=1307804