2011-07-20 01:17 <qi-bot> [commit] Ayla: Added sections directories for the dingux build. (master) http://qi-hw.com/p/gmenu2x/5a27851
2011-07-20 05:29 <wolfspraul> good morning :-)
2011-07-20 06:08 <kyak> indeed!
2011-07-20 06:11 <wolfspraul> kyak: yesterday I saw Niels uploading some NanoMap screenshots, well, I hope they ran on a NanoNote :-)
2011-07-20 06:11 <wolfspraul> a good mapping app would be cool
2011-07-20 06:11 <wolfspraul> just a viewer, but fast, with point of interest lookup, easy pre-downloading of a certain area/city, etc.
2011-07-20 07:29 <qi-bot> The build was successfull, see images here: http://fidelio.qi-hardware.com/~xiangfu/compile-log/openwrt-xburst.full_system-07192011-0403/
2011-07-20 07:55 <kyak> wolfspraul: yeah, it's a cool app and so far Niels kept it working on Ben (though it feels like he tends towards "desktop" features in NanoMap)
2011-07-20 08:48 <viric> xiangfu: ni hao
2011-07-20 08:48 <viric> xiangfu: you should see how 'offrss' makes PDFs for e-ink readers :)
2011-07-20 08:48 <viric> xiangfu: http://vicerveza.homeunix.net/~viric/cgi-bin/offrssdemo/acordem (Plan PDF)
2011-07-20 10:46 <Ayla> mth: here's a patch for gmenu2x: http://pastebin.com/GJRMTEjP
2011-07-20 10:47 <Ayla> mth: I don't know if you already worked on it, so I didn't commit it yet
2011-07-20 10:49 <Ayla> this does fix a lot of memory leaks :)
2011-07-20 10:50 <larsc> Ayla: delete should take NULL just fine, so there is no need to check for it
2011-07-20 10:51 <Ayla> hi larsc 
2011-07-20 10:51 <larsc> hi
2011-07-20 10:51 <Ayla> does delete also set the pointer back to NULL?
2011-07-20 10:51 <larsc> nope
2011-07-20 10:52 <Ayla> ok
2011-07-20 10:54 <Ayla> then here's a new one: http://pastebin.com/mAjKEA7c
2011-07-20 10:58 <mth> Ayla: I haven't worked on it yet, so there is no risk of conflicts
2011-07-20 11:00 <mth> is "< list.end()" valid?
2011-07-20 11:00 <mth> usually I only see != being used there
2011-07-20 11:01 <mth> I don't know if iteration steps are ordered
2011-07-20 11:02 <Ayla> it probably is valid, but I'd prefer having '!=' as well
2011-07-20 11:06 <larsc> iirc it < list.end will not work
2011-07-20 11:06 <larsc> but my c++ is a bit rusty
2011-07-20 11:07 <Ayla> can I push the patch I uploaded?
2011-07-20 11:10 <mth> what does erase() do exactly?
2011-07-20 11:11 <Ayla> it empties the vector
2011-07-20 11:11 <Ayla> (and call the destructor for each object contained on that vector)
2011-07-20 11:17 <mth> "voices.erase(voices.begin(), voices.end());" could be replaced by "voices.clear();" then
2011-07-20 11:17 <mth> actually, won't the destruction of the vector throw away all elements anyway?
2011-07-20 11:17 <mth> then nothing would have to be done in ~SettingsDialog
2011-07-20 11:18 <Ayla> it will destroy the array, but I'm not sure about the elements contained on the array
2011-07-20 11:19 <Ayla> just because you can have pointers to external objects, used elsewhere on your program
2011-07-20 11:19 <mth> this says the element destructors are called: http://www.cplusplus.com/reference/stl/vector/~vector/
2011-07-20 11:19 <mth> pointers don't have destructors
2011-07-20 11:20 <Ayla> then it won't work
2011-07-20 11:20 <Ayla> and it does not work either with erase()
2011-07-20 11:20 <mth> pointers and STL containers are a problem that has only been solved in C++11 afaik
2011-07-20 11:21 <mth> in earlier C++ there is auto_ptr, but the problem with that is that the source becomes null on copy
2011-07-20 11:22 <mth> so if you accidentally pass a container by value, you have just destroyed the original
2011-07-20 11:31 <Ayla> I now use this:
2011-07-20 11:31 <Ayla> Fixed a good number of memory leaks. 
2011-07-20 11:31 <Ayla> ups
2011-07-20 11:31 <Ayla> wrong copy/paste
2011-07-20 11:32 <Ayla> for (uint i=0; i<voices.size(); i++)
2011-07-20 11:32 <Ayla>     delete voices[i];
2011-07-20 11:32 <Ayla> voices.clear();
2011-07-20 11:33 <mth> apparently random-access iterators can be compared with "<": http://www.cplusplus.com/reference/std/iterator/
2011-07-20 11:33 <mth> but "!=" works on any kind of iterator
2011-07-20 11:35 <Ayla> if you don't have any other remarks, I push the changes
2011-07-20 11:35 <mth> I'd prefer this approach: for (vector<MenuSetting *>::iterator it = voices->begin(); it != voices->end(); ++it)
2011-07-20 11:36 <Ayla> ok.
2011-07-20 11:37 <mth> the clear() is not needed as the vector will be destructed automatically
2011-07-20 11:37 <Ayla> rihgt
2011-07-20 11:37 <Ayla> right*
2011-07-20 11:45 <Ayla> so here's a new diff: http://pastebin.com/8nHBQr2b
2011-07-20 11:47 <Ayla> if I success to find the gmenu2x bug with the VTs tonight, I'll have a look at bootsplash
2011-07-20 11:51 <mth> patch looks good now
2011-07-20 11:52 <mth> there is also still the problem with the thread that remains after exec
2011-07-20 12:10 <Ayla> I'll be back tonight
2011-07-20 18:40 <qi-bot> [commit] Ayla: Fixed a good number of memory leaks. (master) http://qi-hw.com/p/gmenu2x/81a607c
2011-07-20 19:04 <kristianpaul> wpwrak_: http://elespectador.com/tecnologia/articulo-285801-argentina-sera-el-noveno-productor-mundial-de-blackberry
2011-07-20 19:15 <wpwrak_> kristianpaul: hmm ... probably a factory hall where they take the bottom shell, put the PCB in it, place the top shell on it, then squeeze
2011-07-20 19:16 <wpwrak_> kristianpaul: most of the "investment" were probably bribes ;-)
2011-07-20 19:16 <wpwrak_> kristianpaul: that whole "industry" in tierra del fuego is a bit of a scam
2011-07-20 19:17 <methril_work> a interesting new!!! 
2011-07-20 19:17 <methril_work> https://lkml.org/lkml/2011/7/19/309
2011-07-20 19:21 <kyak> wonder if it possible to turn Ben into a real time machine
2011-07-20 19:21 <kyak> perform some signal processing or whatever
2011-07-20 19:21 <wpwrak_> methril__: sounds promising
2011-07-20 19:22 <wpwrak_> kyak: would ubb-vga be real-time enough ? ;-)
2011-07-20 19:23 <kyak> wpwrak_: not sure. Can you halt all other tasks and do some processing in hard real time?
2011-07-20 19:24 <wpwrak_> kyak: i halt all other tasks, oh yes ;-)
2011-07-20 19:24 <methril_work> kyak, why you need a RT-Ben?
2011-07-20 19:24 <wpwrak_> kyak: although this is by simply disabling interrupts :)
2011-07-20 19:24 <methril_work> wpwrak_, is applying new RT concepts with UBB /)
2011-07-20 19:24 <methril_work> ;)
2011-07-20 19:25 <kyak> methril_work: it's a good question, probably i don't need it at all. But it's interesting and fun
2011-07-20 19:25 <methril_work> kyak, i know :)
2011-07-20 19:25 <kyak> wpwrak_: i might want to have a look into how you do it then :)
2011-07-20 19:26 <wpwrak_> grmbl. openscad seems to have sprouted a gazillion other little cad variants, each with a different feature set, and of course none really complete
2011-07-20 19:27 <kyak> i'm doing some steps to implement Ben NanoNote target support in MATLAB/Simulink.. It's hard to say where it's going, but it is interesting so far
2011-07-20 19:27 <wpwrak_> kyak: (ubb-vga) the dirty way :)
2011-07-20 19:27 <kyak> so far, no real time.. Just implement some things in Simulink and see it running on Ben, not real time
2011-07-20 19:27 <methril_work> kyak, but are you going to use RTAI or RT patch?
2011-07-20 19:28 <wpwrak_> kyak: there is one "interrupt" source. and that's a brief poll of the keyboard at the end of each frame :)
2011-07-20 19:28 <kyak> methril_work: you should be using one of these, yes.. 
2011-07-20 19:28 <kyak> s/you/i
2011-07-20 19:30 <kyak> wpwrak_: do you do this from userspace?
2011-07-20 19:31 <wpwrak_> kyak: yup. look at the code. it's not very big. http://projects.qi-hardware.com/index.php/p/ben-blinkenlights/source/tree/master/ubb-vga/ubb-vga.c
2011-07-20 19:32 <kyak> wpwrak_: this is intersting. Perhaps i can do the same when deploying my application - then i don't need the RT patch?
2011-07-20 19:33 <wpwrak_> kyak: if you don't mind halting the rest of the system, perhaps not
2011-07-20 19:33 <wpwrak_> kyak: the system survives this abuse. i.e., when ubb-vga exits, the ben returns to normal operation. the system time is probably off, though
2011-07-20 19:33 <kyak> not only i don't mind doing that, but i'd like to do that :)
2011-07-20 19:34 <wpwrak_> perfect then :)
2011-07-20 19:35 <kyak> i liked the RTLinux approach though, when they have some RT governor and linux kernel is running inside of it
2011-07-20 19:35 <kyak> and then your real time application can step in and take the priority
2011-07-20 19:38 <wpwrak_> oh yes. it's a lot more versatile. also has quite different requirements than ubb-vga. ubb-vga is more a device driver than a proper RT task
2011-07-20 19:38 <kyak> wpwrak_: what if i want to visualize something while running such application? I will have to enable interrupts at least for LCD driver (if such thing is even possible) and this could also lead to loosing the real time schedule?
2011-07-20 19:45 <kyak> i don't quite understand why it is so easy to disable interrupts from userspace.. Would it work if started by regular user?
2011-07-20 19:48 <kyak> also, the interrupts are relevant for device drivers, right? Would other running appplication cause any problems?
2011-07-20 19:51 <wpwrak_> kyak: you need to be root to do all this
2011-07-20 19:51 <wpwrak_> kyak: ubb-vga disables everything else. other drivers, other processes, etc.
2011-07-20 19:52 <wpwrak_> kyak: if your timing requirements are less crazy, you can leave the LCD display on. the refresh happens automatically. it just eats a bit of memory bandwidth and introduces memory access delays.
2011-07-20 19:55 <kristianpaul> wpwrak_: (scam) :-S, got it
2011-07-20 19:56 <wpwrak_> kyak: don't forget that ubb-vga is very sensitive to delays. each 18 ns it must deliver another pixel (4 bits)
2011-07-20 19:59 <wpwrak_> kyak: there's of course prefetching. de facto, the delay tolerance should be 1-2 us. if anything delays things beyond this, the timing falls apart.
2011-07-20 20:19 <kristianpaul> kyak: when is next "image" will be released?
2011-07-20 20:19 <kristianpaul> want to play allegro games and check last nanomap :)
2011-07-20 20:44 <kyak> wpwrak_: cool, thanks for explanations :)
2011-07-20 20:45 <kyak> kristianpaul: you would have to ask xiangfu, but you can always try the latest "nightly" build
2011-07-20 22:54 <kristianpaul> kyak: there is Makefile or script that flash my nanonote from  "nightly" build?
2011-07-20 23:56 <kristianpaul> freeze again when reading :S