User defined stacks for threads using glibc-2.3.5 Post: 302180377

Sponsored Content

Top Forums UNIX for Advanced & Expert Users User defined stacks for threads using glibc-2.3.5 Post 302180377 by mysterious on Monday 31st of March 2008 01:47:49 AM

03-31-2008

Registered User

User defined stacks for threads using glibc-2.3.5

Hi,

I am currently working with threads using linux 2.6.11 and glibc 2.3.5 on x86. When i am trying to create thread with user defined stacks glibc gives segmentation fault. I have written a wrapper to pthread_create () and generated shared object for the same. When i am trying to create any thread (for user defined stack) using this shared object i am getting segmentation fault. If i don't create shared object and try to create thread (with user defined stack) using same code, it works fine. I am not able to understand this behavior. Why creating a thread using shared object shall result in segfault. And how to overcome this situation.

NOTE: I got same behavior when tried with linux 2.6.12 and glibc-2.3.6 on arm platform.

gdb output for the behavior is :

Loaded symbols for /lib/libgcc_s.so.1
#0 0x0018a777 in memset () from /lib/libc.so.6
(gdb) bt'
#0 0x0018a777 in memset () from /lib/libc.so.6
No symbol table info available.
#1 0x003e27ef in pthread_create@@GLIBC_2.1 () from /lib/libpthread.so.0
No symbol table info available.
#2 0x003e29fd in pthread_create@GLIBC_2.0 () from /lib/libpthread.so.0
No symbol table info available.
#3 0x00ed9880 in process_create (entry_point=0x8048f4c <ThreadEntryPoint>, pArg=0x1, pStack=0x82e08a8, ulStack_Size=16384, ulPrio=127)
at multithreading.c:1916
stThAttr = {__size = "c\000\000\000\002\000\000\000j\000\000\000\000\02 0\000\000�H.\b\000@", '\0' <repeats 13 times>, __align = 99}
stSchedParam = {__sched_priority = 99}
pstTd = (ThreadData_t *) 0xedd7d8
state = 0
chPriority = 99 'c'
ulRetVal = 0
pRetVal = 0x0
__FUNCTION__ = "process_create"
#4 0x08049af8 in process_create_test (ulInParam=1) at multithreading_test.c:539
ulIndex = 0
lRetVal = -1
ulThreadIndex = 1
lTestPassFlag = 0
stack = (void *) 0x82d88a8
pStack = (void *) 0x82e08a8
ulPrio = 127
stackSize = 16384
__FUNCTION__ = "process_create_test"
#5 0x0804b14b in main () at multithreading_test.c:1460
chChoice = "1"
lChoice = 1
stack = (void *) 0x0
stackSize = 0
ulPrio = 0
ulLoopIndex = 0
stTime = 134533384
stTimeInfo = {tm_sec = 4, tm_min = 53, tm_hour = 7, tm_mday = 7, tm_mon = 3, tm_year = 74, tm_wday = 0, tm_yday = 96, tm_isdst = 0,
tm_gmtoff = 19800, tm_zone = 0x82d81b8 "IST"}
achTimebuf = "04/07/1974 07:53:w"
stThAttr = {__size = '\0' <repeats 13 times>, "\020", '\0' <repeats 21 times>, __align = 0}
lFlag = 1
chFlag = 0
lTestPassFlag = 0
ulThreadIndex = 0
ulloopIndex = 1
ulThreadId = {0, 0, 0, 0}
__FUNCTION__ = "main"
(gdb) f 0
#0 0x0018a777 in memset () from /lib/libc.so.6
(gdb) f 1
#1 0x003e27ef in pthread_create@@GLIBC_2.1 () from /lib/libpthread.so.0
(gdb)

Please let me know if someone can help me.

Thanks,
Ashish

mysterious

View Public Profile for mysterious

Find all posts by mysterious

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Nawk user-defined function

HELP!!!! I am in an on-line shell programming class and have a question. Here is the data: Mike Harrington:(510) 548-1278:250:100:175 Christian Dobbins:(408) 538-2358:155:90:201 Susan Dalsass:(206) 654-6279:250:60:50 (There are 12 contribuors total) This database contains names, phone...

2. AIX

User defined signal 1

Hi, I am just running a incremental back-up on one of my server. But these days It abrubtly fails with below error. ========== User defined signal 1 =========== When I rerun the back-up, It completed successfully.Earlier this was not happening. Any Idea, what could be the problem...

3. UNIX for Dummies Questions & Answers

User defined service

I want to add a new IP service which executes a script on SCO OS5. I have amended /etc/services and added to port number (3333) I have amended /etc/inetd.conf and added a line for this service but I can't get it to execute my own shell script When I telnet to the IP address on port 3333 I...

4. Shell Programming and Scripting

need help with User Defined Function

Dear Friends, I need a help regarding User defined function in shell script. My problem is as follows: my_func.sh my_funcI(){ grep 'mystring' I.dat } my_funcQ(){ grep 'mystring' Q.dat } myfuncI myfuncQ But As both the function has same function only the...

5. Linux

User defined stacks for threads using glibc-2.3.5

6. Programming

add more user-defined signals

Hi Is there a way to add more user-defined signals? I am currently using SIGUSR1 and SIGUSR2 - but I need another one. How can I do that? Thanks!

7. Shell Programming and Scripting

User defined functions in awk

Hi; Is der ne to to use user defined functions for the values in awk find $1 -type f -ls | nawk '{{print "|"$3"|"$5"|"$6"|"$8"|"$9"|"$10"|"} for(i=11;i<=NF;i++){printf("%s",$i)}}' In above command i want to append some values returned by user functions on line. thnks; ajay

8. UNIX for Dummies Questions & Answers

user defined commands

Hi, i would like to create user defined commands. e,g: if an user executes , mkdircd test then a directory called test should be created and it should be cd to test. How i can create the command mkdircd with below action: mkdir $1 && cd $1. Please help me in achieving this

9. UNIX and Linux Applications

Install glibc-debug for glibc-2.11.3-17.31.1 on SLES 11

I have to debug a function getopt_long in glibc-2.11.3-17.31.1. For that how can I download and install its corresponding glibc-debug on SLES 11?

LEARN ABOUT X11R4

libpthread

libpthread(3LIB)						Interface Libraries						  libpthread(3LIB)

NAME

       libpthread - POSIX threads library

SYNOPSIS

       cc -mt [ flag... ] file... -lpthread [ -lrt library... ]

DESCRIPTION

       Historically, functions in this library provided POSIX threading support. See standards(5).  This functionality now resides in libc(3LIB).

       This  library  is  maintained  to provide backward compatibility for both runtime and compilation environments. The shared object is imple-
       mented as a filter on libc.so.1. New application development needs to specify -lpthread only to obtain POSIX  semantics	for  fork(2)  that
       assumes the behavior of fork1(2) rather than the default behavior that forks all threads.

INTERFACES

       The  shared  object  libpthread.so.1 provides the public interfaces defined below. See intro(3) for additional information on shared object
       interfaces.

       __pthread_cleanup_pop		  __pthread_cleanup_push
       pthread_attr_destroy		  pthread_attr_getdetachstate
       pthread_attr_getguardsize	  pthread_attr_getinheritsched
       pthread_attr_getschedparam	  pthread_attr_getschedpolicy
       pthread_attr_getscope		  pthread_attr_getstackaddr
       pthread_attr_getstacksize	  pthread_attr_init
       pthread_attr_setdetachstate	  pthread_attr_setguardsize
       pthread_attr_setinheritsched	  pthread_attr_setschedparam
       pthread_attr_setschedpolicy	  pthread_attr_setscope
       pthread_attr_setstackaddr	  pthread_attr_setstacksize
       pthread_cancel			  pthread_cond_broadcast
       pthread_cond_destroy		  pthread_cond_init
       pthread_cond_reltimedwait_np	  pthread_cond_signal
       pthread_cond_timedwait		  pthread_cond_wait
       pthread_condattr_destroy 	  pthread_condattr_getpshared
       pthread_condattr_init		  pthread_condattr_setpshared
       pthread_create			  pthread_detach
       pthread_equal			  pthread_exit
       pthread_getconcurrency		  pthread_getschedparam
       pthread_getspecific		  pthread_join
       pthread_key_create		  pthread_key_delete
       pthread_kill			  pthread_mutex_consistent_np
       pthread_mutex_destroy		  pthread_mutex_getprioceiling
       pthread_mutex_init		  pthread_mutex_lock
       pthread_mutex_setprioceiling	  pthread_mutex_trylock
       pthread_mutex_unlock		  pthread_mutexattr_destroy
       pthread_mutexattr_getprioceiling   pthread_mutexattr_getprotocol
       pthread_mutexattr_getpshared	  pthread_mutexattr_getrobust_np
       pthread_mutexattr_gettype	  pthread_mutexattr_init
       pthread_mutexattr_setprioceiling   pthread_mutexattr_setprotocol
       pthread_mutexattr_setpshared	  pthread_mutexattr_setrobust_np
       pthread_mutexattr_settype	  pthread_once
       pthread_rwlock_destroy		  pthread_rwlock_init
       pthread_rwlock_rdlock		  pthread_rwlock_tryrdlock
       pthread_rwlock_trywrlock 	  pthread_rwlock_unlock
       pthread_rwlock_wrlock		  pthread_rwlockattr_destroy
       pthread_rwlockattr_getpshared	  pthread_rwlockattr_init
       pthread_rwlockattr_setpshared	  pthread_self
       pthread_setcancelstate		  pthread_setcanceltype
       pthread_setconcurrency		  pthread_setschedparam
       pthread_setspecific		  pthread_sigmask
       pthread_testcancel

FILES

       /lib/libpthread.so.1		       a filter on /lib/libc.so.1

       /lib/64/libpthread.so.1		       a filter on /lib/64/libc.so.1

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsl (32-bit)		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWcslx (64-bit) 	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       pvs(1), intro(2), intro(3), libc(3LIB), libc_db(3LIB), libthread(3LIB), attributes(5), standards(5), threads(5)

SunOS 5.10							    24 Mar 2004 						  libpthread(3LIB)