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Old 04-08-2005, 12:47 PM   #1
DrTodd
LQ Newbie
 
Registered: Apr 2005
Posts: 1

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glibc 2.3.4 and pthreads


I read somewhere on the net that glibc 2.3.2 has a known threading issue where threads get livelocked for no reason. I discovered this after my program exhibited these symptoms. The stated cure for this problem was to upgrade to glibc 2.3.3 or higher. I upgraded to 2.3.4 but I still get the same problem. When the program livelocks, I attach gdb to it and do a backtrace and I find that the crucial thread is stuck during a call to pthread_cond_timedwait. The gdb frame entry for this method is as follows:
#1 0xf6fbecfc in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0.

So my question is, if I upgraded to glibc 2.3.4, then why is this line saying GLIBC_2.3.2? Looking at /lib/tls, each of the .so's have version number 2.3.4.

Any idea what is going on there?

thanks,

Todd
 
Old 04-23-2005, 03:53 AM   #2
freakyg
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Registered: Apr 2005
Distribution: LFS 5.0 and 6.1
Posts: 705

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evidently some of the shared libraries did not get upgraded............you may need to move some of these manually............it's a pain I know but, .........
 
Old 04-26-2005, 12:13 PM   #3
rekhakp
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Registered: Apr 2005
Posts: 3

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libpthread- glibc 2.3.5-building

I'm porting glibc 2.3.5 to a new platform, one of our requirement is to build glibc static only, I mean -disable-shared. It means only "*.a" libraries will be created. Last time I built glibc 2.2.x where I could build all libs with -disable-shared flag in configure command, this time with glibc 2.3.5 while building modules such pwd, zic etc it throws error messages related pthread symbols undefined. Does it mean I cannot build pthread for static linking?

Example error messages
libc.a(setenv.o): In function `D.L_DL26':
setenv.o(.text+0x52c): undefined reference to `__pthread_mutex_unlock'
setenv.o(.text+0x530): undefined reference to `__pthread_mutex_unlock'
setenv.o(.text+0x54c): undefined reference to `__pthread_mutex_unlock'
setenv.o(.text+0x554): undefined reference to `__pthread_mutex_unlock'



libc.a(vfwprintf.o): In function `D.L_DL67':
vfwprintf.o(.text+0x1268): undefined reference to `_pthread_cleanup_push_defer'
vfwprintf.o(.text+0x126c): undefined reference to `_pthread_cleanup_push_defer'
vfwprintf.o(.text+0x12ec): undefined reference to `_pthread_cleanup_push_defer'
vfwprintf.o(.text+0x12f0): undefined reference to `_pthread_cleanup_push_defer'

Appreciate any valid feedback.
Thanks,
rekha
 
  


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