Re: Debugging a threads executable under Redhat Linux

From: Bob Carragher (dancebob_at_mindspring.com)
Date: Sat May 25 2002 - 05:41:58 BST

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    callum.gibson_at_db.com sez:

> It's worth noting, for those who may not know, that the linux threads
> implementation is not POSIX compliant. According to POSIX, separate
> threads should not have separate PIDs, they are all part of the same
> process. Of course, in a userland thread implementation (such as *BSD)
> you have to get this.

Although this is probably not of general mailing-list
interest (and so you can email me directly if you want),
I was wondering if you could explain what "userland"
means.  Or is there a good web site where I can read up
on this?

Thanks!

> c) Debugger support could be provided (on platforms where it makes sense)
> by use of something like solaris' libthread_db (I think linux has this
> too). If someone added support for libthread_db on those platforms that
> have it, it would be a bonus. It would also isolate linux folk from changes
> in the implementation (in theory).

Under the 2.2.14 kernel, there is a libthread_db library.
It is version 1 (i.e. the library file is libthread_db.so.1).
Does that help?

				Bob

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