Re: howto serialize tasks in .xsession

From: Gregory Seidman (gss+debian_at_cs.brown.edu)
Date: 02/29/04

  • Next message: David Baron: "Locale problems on 2.6.2 bootup" 
    Date: Sun, 29 Feb 2004 02:09:17 -0500
To: debian-user@lists.debian.org

    On Sat, Feb 28, 2004 at 03:50:17PM -0800, Nano Nano wrote:
    } I run a hybrid desktop: gnome-control-center is installed, but not
    } metacity. Fluxbox is my WM; but I remove gnome-session as a Session
    } Manager so I have No Session Manager. Here is my .xsession:
    }
    } #!/bin/sh
    } ARGS="--hide-menubar --window-with-profile=Default"
    } #gnome-control-center
    } gnome-settings-daemon --oaf-activate-iid=OAFIID:GNOME_SettingsDaemon --oaf-ior-fd=21 &
    } xscreensaver -nosplash &
    } kdeinit &
      ( sleep 5
    } gbuffy &
    } #xmms &
    } gnome-terminal $ARGS --geometry=80x25+1+22 &
    } gnome-terminal $ARGS --geometry=95x25+582+22 &
    } gnome-terminal $ARGS --geometry=80x40+1+418 &
    } gnome-terminal $ARGS --geometry=95x40+582+418 &
      )
    } exec fluxbox
    [...]
    } The problem is if gbuffy or gnome-terminal starts before
    } gnome-settings-daemon, themes and various gnome-ish things are broken.
    } It's a classic race conditions.
    }
    } How can I serialize the tasks? Remember, none can block.
    } gnome-settings-daemon doesn't return.

    Note the two added lines above. This is the simplest way to deal with
    that sort of thing. Adjust the length of the sleep to taste. A better
    way is to use a spinlock wrapped around lsof or netstat right after the
    gnome-settings-daemon call (note that calling it without any arguments
    works at least as well):

    #...
    gnome-settings-daemon &
    GSDPID=$!
    while lsof -u$USER | awk 'BEGIN { found = 0; }
            ($2 == "'$GSDPID'") && ($8 ~ /orbit-'$USER'/) { found = 1; next }
            END { exit found }'
    do
            sleep 1
    done
    sleep 1
    #...

    This will run lsof once a second until gnome-settings-daemon has set up
    its unix socket, then sleep one extra second for safety, then proceed.
    Note that it uses the pid gnome-settings-daemon started with, so other
    instances of the daemon will be ignored.

    --Greg 

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