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<damo22>youpi: how do you know where to protect a thread with mutexes when making it multithreaded?

<damo22>i mean in the context of a translator like rumpdisk

<damo22>also, when you take the mutex, what is supposed to happen when it's already locked? EBUSY?

<damo22>demo@zamhurd:~$ sudo grub-install /dev/wd0

<damo22>Installing for i386-pc platform.

<damo22>grub-install: error: cannot find a GRUB drive for part:2:device:wd0. Check your device.map.

<youpi>damo22: when you take a mutex, as long as it's busy the mutex_lock call blocks

<youpi>so you don't have to care

<youpi>you have to protect any shared data structure

<youpi>so e.g. a list of things

<youpi>between someone that adds something to it and someone that reads it

<youpi>I'd need a backtrace etc. for the grub issue, I'm not getting this

<damo22>do you use part:2:device:wd0 in your root= or do you use /dev/wd0s2

<youpi>part:2:device:wd0

<youpi>but update-grub doesn't look at that

<damo22>thats strange because i do too, but /etc/mtab says /dev/wd0s2

<youpi>it looks at the ext2fsb mount

<youpi>which says wd0s2

<damo22>how can grub detect part:2:...

<damo22>it prints that in its error message

<damo22>when you say you need a backtrace, it does not crash so where would you like the trace?

<youpi>going through the code

<youpi>to see where it gets that info from

<damo22>ok

<damo22>is this what i test? https://git.savannah.gnu.org/git/grub.git/

<damo22>or do i go through the debian package

<damo22>grub_util_get_grub_dev

<damo22>has 3 methods

<damo22>it tries 3 different ways to get the disk from the device

<damo22>grub-install has no debug symbols

<damo22>0x08121409 in grub_util_biosdisk_get_grub_dev ()

<damo22>(gdb) bt

<damo22>#0 0x08121409 in grub_util_biosdisk_get_grub_dev ()

<damo22>#1 0x081210f2 in grub_util_get_grub_dev ()

<damo22>#2 0x0803f875 in main ()

<damo22>it goes through all three

<damo22>Thread 4 hit Breakpoint 2, 0x08121cb9 in grub_util_find_hurd_root_device ()

<damo22>(gdb) bt

<damo22>#0 0x08121cb9 in grub_util_find_hurd_root_device ()

<damo22>#1 0x0812233e in grub_guess_root_devices ()

<damo22>#2 0x0803f7c2 in main ()

<damo22>i cant get debugging symbols :|

<youpi>did you install the -dbgsym packages?

<damo22>yes

<damo22>i installed grub*dbg*

<damo22>not via that command but i searched the list and installed htme

<youpi>I have found missing parsing for part: before device:

<youpi>I have uploaded a fixed package to debian-ports

<damo22>\o/

<youpi>I have uploaded them on http://dept-info.labri.fr/~thibault/tmp/ if you want to give it a try

<youpi>you should only need grub-common and grub2-common

<damo22>grub-install: error: Storage information for `/dev/wd0s2' does not include type.

<youpi>usually you'd install on /dev/wd0 not /dev/wd0s2

<damo22>i did /dev/wd0

<damo22>demo@zamhurd:~$ sudo grub-install /dev/wd0

<damo22>Installing for i386-pc platform.

<damo22>grub-install: error: Storage information for `/dev/wd0s2' does not include type.

<youpi>I'm not getting this with a freshl yinstalled system

<youpi>and grub-common grub2-common version +hurd.6

<damo22>ok

<damo22>should i reboot and try again?

<youpi>I don't think that'll change anything

<youpi>the diff between +hurd.5 and +hurd.6 is in the parsing, not grub.Cfg generation

*youpi gotta sleep

<damo22>goonight

<damo22>goodnight*

<damo22>i had the wrong settrans on /dev/wd0s2

<damo22>demo@zamhurd:~$ showtrans /dev/wd0s2

<damo22>/hurd/storeio -T typed part:2:device:@/dev/disk:/dev/wd0

<damo22>should have been /hurd/storeio -T typed part:2:device:@/dev/disk:wd0

<damo22>fixed

<damo22>+hurd.6 works!

<damo22>demo@zamhurd:~$ showtrans /dev/wd0s2

<damo22>/hurd/storeio -T typed part:2:device:@/dev/disk:wd0

<damo22>demo@zamhurd:~$ sudo grub-install /dev/wd0

<damo22>Installing for i386-pc platform.

<damo22>Installation finished. No error reported.

<damo22>how do you ensure that the mutex only applies per thread? do you have to make it a global?

<damo22>i think my mutex patch might fix the refcount even though multithreading is not enabled yet

<youpi>damo22: a mutex has to be global otherwise it's useless :)

<youpi>yes, that'd fix the refcount as well

<damo22>i sent in a patch :)

<damo22>here's an example of what you can do with 12 microphones and only free software: https://zamaudio.com/mbox2/chimes_20220226.flac i hope to be able to use Hurd for this kind of thing one day :)

<biblio>damo22: I believe soon. :)

<youpi>if anybody sees curiosa, tell that +hurd.6 should solving the issue

<user_oreloznog>damo22: Nice!

<Jari-->hi all + Richard Stallman friends

<Jari-->Personally I am building a CP/M Plus revision of 2022.

<Jari-->X86 based OS.

***Guest8046 is now known as roptat

<ThinkT510>Jari--: got a public repo to follow?

<spk121>CP/M was my first OS. All I remember is that there was a command called 'pip' and a word processor called WordStar

<Gooberpatrol66>damo22: that's a really awesome song

IRC channel logs

2022-02-26.log