GDB 6.0 and FreeBSD threads

[Julian Elischer]

Niall Douglas wrote:
> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
> 
> On 28 Mar 2004 at 21:13, Julian Elischer wrote:
> 
> 

> 
> You must remember I've never been near FreeBSD before. When the man page says
> POSIX threads are supported, I assumed that meant a full implementation in
> libc_r as the man page specifies. You can see why I might think that,
> especially as libc_r doesn't complain when my code sets PTHREAD_SCOPE_SYSTEM
> which libc_r should return an error on by rights.

On this topic, There are 3 separate compatible threads libraries Libc_r
is only SCOPE_PROCESS, libpthreads implements SCOPE_PROCESS and SCOPE_SYSTEM, 
and libthr is only SCOPE_SYSTEM. Do you run ALL threads as scope system, or
only  some?
We don't recommend COPE_SYSTEM unless it's really needed (for example to
make some threads run at higher/lower priorities) as they are less
efficient. Benchmark your app with both types. (I think Linux is only SCOPE_SYSTEM).


> 
> BTW on my FreeBSD v5.2.1 the library is called libkse, not libpthread which
> doesn't exist.
> 

That's the problem with the fact that this field moving so quickly.
You should probably upgrade to -current so that you can debug these threads.
and get reeady for yur app to run on 5.3.

> 
>>> You guys could seriously improve the documentation inside the man pages.
>>> Please! Just a two line paragraph would have saved me more than a day of
>>> work.
>> 
>> we can't guess what question every developer is going to ask.. But possibly
>> the following paragraph in "man pthread" might be made a bit clearer...
> 
> 
> Typing man pthread on my FreeBSD v5.2.1 does not show the text you quoted.
> Instead it says it's in libc_r and mentions nothing else.

Hmm maybe it was added since.. oh well. At least you get to see that we
are trying to cover the blank spots.



> 
> 
>>> After linking to libkse and finding it really doesn't like coexisting
>>> with libc_r, I discovered the libmap.conf trick and it works now.
>>> Unfortunately I'm back to square one in that no gdb supports kse threads.
>>> This is a major problem as my code is heavily multithreaded.
>> 
>> why is libc_r beinbg linked into your application? you need to select ONE
>> of the libraries and link with that..
> 
> 
> It's not me. I link against libGL and /it/ is linked against libc_r.

warning: if you use the nvidia GL libraries you can not yet use libpthread.

> 
> 
>> The threads support package is at:
>> 
>> http://people.freebsd.org/~davidxu/kse/thread_db/ however, realise that
>> this is PRE_ALPHA. you are "on your own" except for direct corespondence
>> with david.
> 
> 
> Wicked. I had searched google for that in vain so thank you. Do I post bug
> reports here or to David directly?

directly to david.. it's still in prerelease.
Also, you MUST be running TODAY'S -current so you'll need to upgrade.
Sorry but it's an area of active development.




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