2015-05-28

[Technology] Memory leaks, vala, and copying delegates

Some of the Gee data structures, like a TreeSet, can get a comparator, a GLib.CompareDataFunc comparator. 



If I define a compliant static function and hand it over to the TreeSet's constructor, I get a warning that copying delegates is not supported.  I can't really change how TreeSet handles it, and I couldn't find how I was supposed to pass it elsewhere, so I passed it over like this (not exact code):



class ApplePie : Pie {

  private GLib.CompareDataFunc get_cmp () {

    return (a,b) => { return a.foo - b.foo; };

  }

}

class CherryPie : Pie {

  private GLib.CompareDataFunc get_cmp () {

    return (a,b) => { return a.bar - b.bar; };

  }

}

class Pie {

  TreeSet ts;

  public Pie () {

    ts = new TreeSet (this.get_cmp ());

  }

}



You see, I needed different comparators for different subclasses, but I couldn't just hand over static functions.  However, somehow, passing a function instantiated in this manner to new TreeSet () resulted in an increase to the reference count for pie!   And, in fact, I had 10 different collections that made use of 3 different comparators like this.  And I went through 10,000s of pies!  I think you can start to see my problem.



The functions were causing reference cycles so none of my pies were being freed when I was finished with them, and I quickly ran out of memory. :D  Hooray!



Right now, I'm doing what I'm not supposed to, and passing static functions (copying delegates) to the new TreeSet constructor (they're passed from the subclass to the superclass through base (), so that might be a part of the problem) and things are working alright.



I'm grateful for Malloc.mallinfo ().uordblks, and for GLib.Object.ref_count for helping me see into problem today.

2015-05-26

[Technology] emacs and vala-mode: set-difference

When using emacs 24.5 and vala-mode, I started getting this error:

"Symbol's function definition is void: set-difference"



After some googling, it turns out to be related to cc-mode using cl (CommonLisp).  The not-ideal workaround for now is to apparently include


(require 'cl)

In your ~/.emacs file.

Dieses Blog durchsuchen

Labels

#Technology #GNOME gnome gxml fedora bugs linux vala google #General firefox security gsoc GUADEC android bug xml fedora 18 javascript libxml2 programming web blogger encryption fedora 17 gdom git emacs libgdata memory mozilla open source serialisation upgrade web development API Spain containers design evolution fedora 16 fedora 20 fedora 22 fedup file systems friends future glib gnome shell internet luks music performance phone photos php podman preupgrade tablet testing typescript yum #Microblog Network Manager adb apache art automation bash brno catastrophe css data loss debian debugging deja-dup disaster docker emusic errors ext4 facebook fedora 19 gee gir gitlab gitorious gmail gobject google talk google+ gtk html libxml mail microsoft mtp mysql namespaces nautilus nextcloud owncloud picasaweb pitivi ptp python raspberry pi resizing rpm school selinux signal sms speech dispatcher systemd technology texting time management uoguelph usability video web design youtube #Tech Air Canada C Electron Element Empathy Europe GError GNOME 3 GNOME Files Go Google Play Music Grimes IRC Mac OS X Mario Kart Memento Nintendo Nintendo Switch PEAP Selenium Splatoon UI VPN Xiki accessibility advertising ai albums anaconda anonymity apple ask asus eee top automake autonomous automobiles b43 backup battery berlin bit rot broadcom browsers browsing canada canadian english cars chrome clarity comments communication compiler complaints computer computers configuration console constructive criticism cron cropping customisation dataloss dconf debug symbols design patterns desktop summit development discoverability distribution diy dnf documentation drm duplicity e-mail efficiency email english environment estate experimenting ext3 fedora 11 festival file formats firejail flac flatpak forgottotagit freedom friendship fuse galaxy nexus galton gay rights gdb german germany gimp gio gjs gnome software gnome-control-center google assistant google calendar google chrome google hangouts google reader gqe graphviz growth gtest gtg gvfs gvfs metadata hard drive hard drives hardware help hp humour ide identity instagram installation instant messaging integration intel interactivity introspection jabber java java 13 jobs kernel keyboard language language servers languages law learning lenovo letsencrypt libreoffice librpm life livecd liveusb login lsp macbook maintainership mariadb mario matrix memory leaks messaging mounting mouse netflix new zealand node nodelist numix obama oci ogg oggenc oh the humanity open open standards openoffice optimisation org-mode organisation package management packagekit paint shedding parallelism pdo perl pipelight privacy productivity progress progressive web apps pumpkin pwa pyright quality recursion redhat refactoring repairs report rhythmbox rust sandboxes scheduling screenshots self-navigating car shell sleep smartphones software software engineering speed sql ssd synergy tabs test tests themes thesis tracker travel triumf turtles tv tweak twist typing university update usb user experience valadoc video editing volunteering vpnc waf warm wayland weather web apps website wifi wiki wireless wishes work xinput xmpp xorg xpath
Powered by Blogger.