Date: Tue, 17 Apr 2001 16:35:41 +0200 From: Tor.Egge@fast.no To: mflaster@research.bell-labs.com Cc: ports@freebsd.org Subject: Re: FreeBSD Port: linuxthreads-2.1.3_2 Message-ID: <200104171435.QAA90670@midten.fast.no> In-Reply-To: Your message of "Mon, 09 Apr 2001 11:15:37 -0400" References: <3AD1D219.13C39F9B@research.bell-labs.com>
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> Hi,
>
> I was wondering if any work was being done on porting linuthreads 2.2.x
> to FreeBSD? Also, is there some text somewhere which explains the
> difference between 2.1.3_1 and 2.1.3_2?
No.
Some text was added to README.FreeBSD:
c) The mutex wrapper functions only provide standard linuxthreads mutexes
(i.e. non-recursive mutexes). This might lead to deadlocks if libc
depends on recursive mutexes.
4) Be aware of the following libgcc issue:
__register_frame_info() and __get_eh_info() from libgcc.a are linked
into shared libraries that use exceptions, e.g. libstdc++. Those
functions are not compatible with linuxthreads due to pthread_mutex_t
and pthread_once_t having different sizes and static initializers.
Linking the shared linuxthreads library before any such library causes
the liblgcc_r.a version of those functions to be used.
The commit message said:
date: 2001/02/20 00:34:56; author: tegge; state: Exp; lines: +13 -0
Initialize attributes for new threads with default values when a NULL
pthread_attr_t is provided as argument to pthread_create.
liblgcc_r_pic.a no longer exists.
Put the liblgcc_r.a version of __get_eh_info() and __register_frame_info()
into the shared linuxthreads library to avoid using the incompatible
libgcc.a version. Shared libraries that use exceptions still represent a
problem if linked before the linuxthreads library.
Compile liblgcc_r.a before the main linuxthreads library to provide
the object files that contains __get_eh_info() and __register_frame_info().
Add minimal wrappers for native thread library functions used by
5.0-CURRENT libc. The wrappers try to call corresponding functions
in the linuxthreads library after performing argument conversion.
Some early versions of 2.1.3_2 still has problems with a bad reference
to .cerror and fail to define __error(), this has later been fixed but
the PORTVERSION variable in the main Makefile for the port has
unfortunately not been bumped.
- Tor Egge
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