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[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]]
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document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled [[GNU Free Documentation
License|/fdl]]."]]"""]]
[[!tag open_issue_libpthread]]
IRC, OFTC, #debian-hurd, 2011-07-21.
<youpi> there's one known issue with pthreads
<youpi> you can't dlopen() it
... if the main application is not already linked against it.
<youpi> which also means you can't dlopen() a module which depends on it if
the main application hasn't used -lpthread already
<youpi> (so as to get libpthread initialized early, not at the dlopen()
call)
<lucas> I get this while building simgrid:
<lucas> cd /home/lucas/simgrid-3.6.1/obj-i486-gnu/examples/gras/console &&
/usr/bin/cmake -E create_symlink
/home/lucas/simgrid-3.6.1/obj-i486-gnu/lib/libsimgrid.so
/home/lucas/simgrid-3.6.1/obj-i486-gnu/examples/gras/console/simgrid.so
<lucas> cd /home/lucas/simgrid-3.6.1/obj-i486-gnu/examples/gras/console &&
lua /home/lucas/simgrid-3.6.1/examples/gras/console/ping_generator.lua
<lucas> lua:
/home/buildd/build/chroot-sid/home/buildd/byhand/hurd/./libpthread/sysdeps/generic/pt-mutex-timedlock.c:68:
__pthread_mutex_timedlock_internal: Assertion `__pthread_threads' failed.
<lucas> Aborted (core dumped)
<youpi> that's it, yes
<youpi> (or at least it has the same symptoms)
<lucas> it would need fixing in lua, not in SG, then, right?
<youpi> yes
<lucas> ok, thanks
The fix thus being: link the main application with -lpthread.
The same symptom appears in an odd case, for instance:
buildd@hurd:~$ ldd /usr/bin/openjade
libthreads.so.0.3 => /lib/libthreads.so.0.3 (0x0103d000)
libosp.so.5 => /usr/lib/libosp.so.5 (0x01044000)
libpthread.so.0.3 => /lib/libpthread.so.0.3 (0x01221000)
libnsl.so.1 => /lib/i386-gnu/libnsl.so.1 (0x01232000)
[...]
openjade links against *both* libthreads and libpthread. The result is that libc
early-initializes libthreads only, and thus libpthread is not early-initialized,
and later on raises assertions. The solution is to just get rid of libthreads,
to have only one threading library.
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