ct-libraries and POSIX threads

HI all,
I have been trying to program sybase ct-libraries for solaris in
a multithreaded environment. But whenever I try to run this program i
get a core dump. Can anyone help me to find some examples or documents
of how to program ct-libraries under POSIX thread environment or for
native threads. I have been using "one thread one connection" model to
keep it simple. Does anyone know why this problem occurs.

I have complied the file using the following options.

[PYTHON:sybaseiq:/export/home/sybaseiq/amol/amol/multhrdmyprog]gcc -g
usingquery.c -o usingquery -I /export/home/sybaseiq/ociq-12_0/include
-L /export/home/sybaseiq/ociq-12_0/lib -lpthread -lcs -lct -lcomn
-lsybdb -ltcl --D_REENTRANT -D_THREAD_SAFE

The stack trace that is generated from the core is given below..
[PYTHON:sybaseiq:/export/home/sybaseiq/amol/amol/multhrdmyprog]gdb
../usingquery core

Core was generated by `./usingquery'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libpthread.so.1...done.
Loaded symbols for /usr/lib/libpthread.so.1
Reading symbols from
/export/home/sybaseiq/ociq-12_0/lib/libcs.so...done.
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libcs.so
Reading symbols from
/export/home/sybaseiq/ociq-12_0/lib/libct.so...done.
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libct.so
Reading symbols from
/export/home/sybaseiq/ociq-12_0/lib/libcomn.so...done.
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libcomn.so
Reading symbols from
/export/home/sybaseiq/ociq-12_0/lib/libsybdb.so...done.
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libsybdb.so
Reading symbols from
/export/home/sybaseiq/ociq-12_0/lib/libtcl.so...done.
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libtcl.so
Reading symbols from /usr/lib/libthread.so.1...done.
Loaded symbols for /usr/lib/libthread.so.1
Reading symbols from /usr/lib/libc.so.1...done.
Loaded symbols for /usr/lib/libc.so.1
Reading symbols from /usr/lib/libsocket.so.1...done.
Loaded symbols for /usr/lib/libsocket.so.1
Reading symbols from /usr/lib/libdl.so.1...done.
Loaded symbols for /usr/lib/libdl.so.1
Reading symbols from /usr/lib/libnsl.so.1...done.
Loaded symbols for /usr/lib/libnsl.so.1
Reading symbols from /usr/lib/libmp.so.2...done.
Loaded symbols for /usr/lib/libmp.so.2
Reading symbols from /usr/platform/SUNW,Ultra-80/lib/libc_p
Loaded symbols for /usr/platform/SUNW,Ultra-80/lib/libc_psr
Reading symbols from /export/home/sybaseiq/ociq-12_0/lib/li
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libi
Reading symbols from /export/home/sybaseiq/ociq-12_0/lib/li
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libt
---Type <return> to continue, or q <return> to quit---
#0 0xff0deb24 in netp_checkextfds () from /export/home/syb
((gdb) where
#0 0xff0deb24 in netp_checkextfds () from /export/home/syb
#1 0xff0dbd78 in netp_callback_poll () from /export/home/s
#2 0xff0d13c4 in syb_net_callback () from /export/home/syb
(gdb)


Waiting eagerly for your reply

Regards,
Amol

On Mon, 13 Sep 2004 22:33:35 -0700, Amol Natekar wrote:

HI all,
I have been trying to program sybase ct-libraries for solaris in
a multithreaded environment. But whenever I try to run this program i
get a core dump. Can anyone help me to find some examples or documents
of how to program ct-libraries under POSIX thread environment or for
native threads. I have been using "one thread one connection" model to
keep it simple. Does anyone know why this problem occurs.

I have complied the file using the following options.

[PYTHON:sybaseiq:/export/home/sybaseiq/amol/amol/multhrdmyprog]gcc -g
usingquery.c -o usingquery -I /export/home/sybaseiq/ociq-12_0/include
-L /export/home/sybaseiq/ociq-12_0/lib -lpthread -lcs -lct -lcomn
-lsybdb -ltcl --D_REENTRANT -D_THREAD_SAFE

You need to use the Sybase _r libraries.

Also - does your program use DB-Library at all? If it does then you need
to be very careful as DB-Lib is NOT threadsafe (I say this because I
notice the -lsybdb on the link line, above.)

Michael
--
Michael Peppler Data Migrations, Inc.
mpeppler (AT) peppler (DOT) org http://www.peppler.org/
Sybase T-SQL/OpenClient/OpenServer/C/Perl developer available for short or
long term contract positions - http://www.peppler.org/resume.html

Amol,

Version 12.0 of Sybase's ct library does not use posix threads but
Solaris threads. You would need to link to -lthread.

Version 12.5 of Sybase's ct library uses posix threads.

You are using the gcc compiler. GNU likes posix threads.

For thread-safe Sybase libraries, you must link
with -lct_r, -lcs_r -lcomn_r -lsybtcl_r -lintl_r.

-D_REENTRANT is a Solaris thread declaration. It is not a posix
thread definition. You only use -D_REENTRANT if you want Solaris threads.

You have a double dash with --D_REENTRANT. There is no double dash.

If you want your entire Solaris C/C++ program to be posix compliant
(use posix threads under the covers), compile with -D_POSIX_C_SOURCE=199506L


Brian Ceccarelli
http://www.dbpowersuite.com




"Amol Natekar" <amol.natekar (AT) exact-solutions (DOT) com> wrote

HI all,
I have been trying to program sybase ct-libraries for solaris in
a multithreaded environment. But whenever I try to run this program i
get a core dump. Can anyone help me to find some examples or documents
of how to program ct-libraries under POSIX thread environment or for
native threads. I have been using "one thread one connection" model to
keep it simple. Does anyone know why this problem occurs.

I have complied the file using the following options.

[PYTHON:sybaseiq:/export/home/sybaseiq/amol/amol/multhrdmyprog]gcc -g
usingquery.c -o usingquery -I /export/home/sybaseiq/ociq-12_0/include
-L /export/home/sybaseiq/ociq-12_0/lib -lpthread -lcs -lct -lcomn
-lsybdb -ltcl --D_REENTRANT -D_THREAD_SAFE

The stack trace that is generated from the core is given below..
[PYTHON:sybaseiq:/export/home/sybaseiq/amol/amol/multhrdmyprog]gdb
./usingquery core

Core was generated by `./usingquery'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libpthread.so.1...done.
Loaded symbols for /usr/lib/libpthread.so.1
Reading symbols from
/export/home/sybaseiq/ociq-12_0/lib/libcs.so...done.
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libcs.so
Reading symbols from
/export/home/sybaseiq/ociq-12_0/lib/libct.so...done.
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libct.so
Reading symbols from
/export/home/sybaseiq/ociq-12_0/lib/libcomn.so...done.
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libcomn.so
Reading symbols from
/export/home/sybaseiq/ociq-12_0/lib/libsybdb.so...done.
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libsybdb.so
Reading symbols from
/export/home/sybaseiq/ociq-12_0/lib/libtcl.so...done.
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libtcl.so
Reading symbols from /usr/lib/libthread.so.1...done.
Loaded symbols for /usr/lib/libthread.so.1
Reading symbols from /usr/lib/libc.so.1...done.
Loaded symbols for /usr/lib/libc.so.1
Reading symbols from /usr/lib/libsocket.so.1...done.
Loaded symbols for /usr/lib/libsocket.so.1
Reading symbols from /usr/lib/libdl.so.1...done.
Loaded symbols for /usr/lib/libdl.so.1
Reading symbols from /usr/lib/libnsl.so.1...done.
Loaded symbols for /usr/lib/libnsl.so.1
Reading symbols from /usr/lib/libmp.so.2...done.
Loaded symbols for /usr/lib/libmp.so.2
Reading symbols from /usr/platform/SUNW,Ultra-80/lib/libc_p
Loaded symbols for /usr/platform/SUNW,Ultra-80/lib/libc_psr
Reading symbols from /export/home/sybaseiq/ociq-12_0/lib/li
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libi
Reading symbols from /export/home/sybaseiq/ociq-12_0/lib/li
Loaded symbols for /export/home/sybaseiq/ociq-12_0/lib/libt
---Type <return> to continue, or q <return> to quit---
#0 0xff0deb24 in netp_checkextfds () from /export/home/syb
((gdb) where
#0 0xff0deb24 in netp_checkextfds () from /export/home/syb
#1 0xff0dbd78 in netp_callback_poll () from /export/home/s
#2 0xff0d13c4 in syb_net_callback () from /export/home/syb
(gdb)


Waiting eagerly for your reply

Regards,
Amol