Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Thread parameter in ANSI C makes a segmentation fault
Top Forums Programming Thread parameter in ANSI C makes a segmentation fault Post 302519718 by sehang on Wednesday 4th of May 2011 11:16:57 PM
Old 05-05-2011
Thread parameter in ANSI C makes a segmentation fault
The creation of thread.
Code:
void Client_Constructor ( const char* IPAddr ) {
    pthread_t tid; 
    pthread_attr_t rx;  

    /* Create separate memory for client argument */
    struct ThreadArgs *threadArgs;
    if ( ( threadArgs = ( struct ThreadArgs* ) malloc( sizeof( struct ThreadArgs ) ) ) == NULL )
        exit( -1 );
    threadArgs->pos = 111;

    pthread_rwlock_wrlock( &rwlock );
    node = ....;
    if ( node->state == DISCONNECTED ) {  <-node requires a r/w lock.
        pthread_attr_init( &rx );
        pthread_attr_setdetachstate( &rx, PTHREAD_CREATE_DETACHED );
        pthread_create( &tid, &rx, THREAD_BODY, ( void* )threadArgs );
    }
    pthread_rwlock_unlock( &rwlock );
}

Thread body
Code:
static void* THREAD_BODY ( void* v ) {
    int sockfd;
    char IPStr[ 16 ];
    int index = ( ( struct ThreadArgs* ) v )->pos; free( v ); <-segmentation fault here
.....
}

These code is so strange, when I run the program more than few hours, then a segmentation fault comes. I also dump the log and use gdb to analyze it, the information is shown below
Code:
Program terminated with signal 6, Aborted.
#0  0xb7de1a16 in ?? () from /lib/libc.so.6
(gdb) where
#0  0xb7de1a16 in ?? () from /lib/libc.so.6
#1  0xb7de3318 in ?? () from /lib/libc.so.6
#2  0xb7e1cfdd in fputws () from /lib/libc.so.6
#3  0xb7e1d114 in ?? () from /lib/libc.so.6
#4  0xb7e287ba in realloc () from /lib/libc.so.6
#5  0xb7e28040 in ?? () from /lib/libc.so.6
#6  0xb7e28339 in ?? () from /lib/libc.so.6
#7  0xb7e2476b in ?? () from /lib/libc.so.6
#8  0x0805e945 in THREAD_BODY (v=0x1838b9b0) at Client.c:167
#9  0xb7efffc0 in pthread_create@@GLIBC_2.1 () from /lib/libpthread.so.0
#10 0xb7e8497e in ?? () from /lib/libc.so.6

It anyone give me some suggestions? Is it related to pthread_rwlock?
 

10 More Discussions You Might Find Interesting

1. Programming

Hi! segmentation fault

I have written a program which takes a directory as command line arguments and displays all the dir and files in it. I don't know why I have a problem with the /etc directory.It displays all the directories and files untill it reaches a sub directory called peers which is in /etc/ppp/peers.the... (4 Replies)
Discussion started by: vijlak
4 Replies

2. Programming

segmentation fault

ive written my code in C for implementation of a simple lexical analyser using singly linked list hence am making use of dynamic allocation,but when run in linux it gives a segmentation fault is it cause of the malloc function that ive made use of????any suggestions as to what i could do??? thank... (8 Replies)
Discussion started by: rockgal
8 Replies

3. AIX

Segmentation fault

Hi , During execution a backup binary i get following error "Program error 11 (Segmentation fault), saving core file in '/usr/datatools" Riyaz (2 Replies)
Discussion started by: rshaikh
2 Replies

4. Programming

segmentation fault

If I do this. Assume struct life { char *nolife; } struct life **life; // malloc initialization & everything if(life->nolife == 0) Would I get error at life->nolife if it is equal to 0. wrong accession? (3 Replies)
Discussion started by: joey
3 Replies

5. Programming

segmentation fault.

This code is causing a segmentation fault and I can't figure out why. I'm new to UNIX and I need to learn how to avoid this segmentation fault thing. Thank you so much. Thanks also for the great answers to my last post.:):b: int main() { mysqlpp::Connection conn(false); if... (3 Replies)
Discussion started by: sepoto
3 Replies

6. Programming

Segmentation fault in C

i have this code int already_there(char *client_names, char *username) { int i; for(i = 0; i<NUM; i++) { printf("HERE\n"); if (strcmp(client_names, username)==0) return(1); } return(0); } and i get a segmentation fault, whats wrong here? (7 Replies)
Discussion started by: omega666
7 Replies

7. UNIX for Advanced & Expert Users

segmentation fault with ps

What does this mean and why is this happening? $ ps -ef | grep ocular Segmentation fault (core dumped) $ ps -ef | grep ocular Segmentation fault (core dumped) $ ps aux | grep ocular Segmentation fault (core dumped) $ ps Segmentation fault (core dumped) $ pkill okular $ ps... (1 Reply)
Discussion started by: cokedude
1 Replies

8. Programming

Using gdb, ignore beginning segmentation fault until reproduce environment segmentation fault

I use a binary name (ie polo) it gets some parameter , so for debugging normally i do this : i wrote script for watchdog my app (polo) and check every second if it's not running then start it , the problem is , if my app , remain in state of segmentation fault for a while (ie 15 ... (6 Replies)
Discussion started by: pooyair
6 Replies

9. Programming

Segmentation fault

I keep getting this fault on a lot of the codes I write, I'm not exactly sure why so I'd really appreciate it if someone could explain the idea to me. For example this code #include <stdio.h> main() { unsigned long a=0; unsigned long b=0; int z; { printf("Enter two... (2 Replies)
Discussion started by: sizzler786
2 Replies

10. Programming

C. To segmentation fault or not to segmentation fault, that is the question.

Oddities with gcc, 2.95.3 for the AMIGA and 4.2.1 for MY current OSX 10.14.1... I am creating a basic calculator for the AMIGA ADE *NIX emulator in C as it does not have one. Below are two very condensed snippets of which I have added the results inside the each code section. IMPORTANT!... (11 Replies)
Discussion started by: wisecracker
11 Replies

LEARN ABOUT MOJAVE

pthread_attr_getstack

PTHREAD_ATTR(3) 					   BSD Library Functions Manual 					   PTHREAD_ATTR(3)

NAME

     pthread_attr_init, pthread_attr_destroy, pthread_attr_setstack, pthread_attr_getstack, pthread_attr_setguardsize, pthread_attr_getguardsize
     -- thread attribute operations

SYNOPSIS

     #include <pthread.h>

     int
     pthread_attr_init(pthread_attr_t *attr);

     int
     pthread_attr_destroy(pthread_attr_t *attr);

     int
     pthread_attr_setstack(pthread_attr_t *attr, void *stackaddr, size_t stacksize);

     int
     pthread_attr_getstack(const pthread_attr_t * restrict attr, void ** restrict stackaddr, size_t * restrict stacksize);

     int
     pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize);

     int
     pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize);

     int
     pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize);

     int
     pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guardsize);

     int
     pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr);

     int
     pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr);

     int
     pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate);

     int
     pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate);

     int
     pthread_attr_setinheritsched(pthread_attr_t *attr, int inheritsched);

     int
     pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inheritsched);

     int
     pthread_attr_setschedparam(pthread_attr_t *attr, const struct sched_param *param);

     int
     pthread_attr_getschedparam(const pthread_attr_t *attr, struct sched_param *param);

     int
     pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);

     int
     pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy);

     int
     pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);

     int
     pthread_attr_getscope(const pthread_attr_t *attr, int *contentionscope);

DESCRIPTION

     Thread attributes are used to specify parameters to pthread_create().  One attribute object can be used in multiple calls to
     pthread_create(), with or without modifications between calls.

     The pthread_attr_init() function initializes attr with all the default thread attributes.

     The pthread_attr_destroy() function destroys attr.

     The pthread_attr_set*() functions set the attribute that corresponds to each function name.

     The pthread_attr_get*() functions copy the value of the attribute that corresponds to each function name to the location pointed to by the
     second function parameter.

RETURN VALUES

     If successful, these functions return 0.  Otherwise, an error number is returned to indicate the error.

ERRORS

     The pthread_attr_init() function will fail if:

     [ENOMEM]		Out of memory.

     The pthread_attr_destroy() function will fail if:

     [EINVAL]		Invalid value for attr.

SEE ALSO

     pthread_attr_affinity_np(3), pthread_attr_get_np(3), pthread_create(3)

STANDARDS

     pthread_attr_init(), pthread_attr_destroy(), pthread_attr_setstacksize(), pthread_attr_getstacksize(), pthread_attr_setstackaddr(),
     pthread_attr_getstackaddr(), pthread_attr_setdetachstate(), and pthread_attr_getdetachstate() functions conform to ISO/IEC 9945-1:1996
     (``POSIX.1'')

     The pthread_attr_setinheritsched(), pthread_attr_getinheritsched(), pthread_attr_setschedparam(), pthread_attr_getschedparam(),
     pthread_attr_setschedpolicy(), pthread_attr_getschedpolicy(), pthread_attr_setscope(), and pthread_attr_getscope() functions conform to
     Version 2 of the Single UNIX Specification (``SUSv2'')

BSD
								  January 8, 2010							       BSD
All times are GMT -4. The time now is 07:10 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy