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Full Discussion: This code keeps giving me a segmentation fault why?
Top Forums Programming This code keeps giving me a segmentation fault why? Post 302748197 by fwrlfo on Monday 24th of December 2012 04:36:49 PM
Old 12-24-2012
This code keeps giving me a segmentation fault why?
Code:
#include<stdlib.h>
#include <pthread.h> 
#include "tlpi_hdr.h"
#include <stdio.h> 
static volatile int glob = 0;

static struct { 
pthread_t t1,t2; 
} *thread; 


static void *     /* Loop 'arg' times incrementing 'glob' */ 
threadFunc(void *arg) 
{ 

int loops = *((int *) arg); 
int loc, j, s;
 
if (s != 0)
errExitEN(s, "pthread_mutex_lock");
for (j = 0; j < loops; j++) { 
loc = glob; 
printf("The ID of this thread is: %u\n", (unsigned int)pthread_self());
printf("glob = %d\n", glob);
sleep(2);
loc++; 
glob = loc; 
if (s != 0)
errExitEN(s, "pthread_mutex_unlock");


} 
return NULL; 
} 


int 
main(int argc, char *argv[]) 
{ 
int loops=0;
int s; 

loops = (argc > 1) ? getInt(argv[1], GN_GT_0, "num-loops") : 10000000; 
s = pthread_create(&thread[loops].t1, NULL, threadFunc, &loops);
if (s != 0) 
errExitEN(s, "pthread_create"); 
s = pthread_create(&thread[loops].t2, NULL, threadFunc, &loops);
if (s != 0) 
errExitEN(s, "pthread_create"); 
s = pthread_join(thread[loops].t1, NULL); 
if (s != 0) 
errExitEN(s, "pthread_join"); 
s = pthread_join(thread[loops].t2, NULL); 
if (s != 0) 
errExitEN(s, "pthread_join"); 
printf("final glob = %d\n", glob); 
exit(EXIT_SUCCESS); 
}

 

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LEARN ABOUT NETBSD

pthread_join

PTHREAD_JOIN(3) 					   BSD Library Functions Manual 					   PTHREAD_JOIN(3)

NAME

     pthread_join -- wait for thread termination

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_join(pthread_t thread, void **value_ptr);

DESCRIPTION

     The pthread_join() function suspends execution of the calling thread until the target thread terminates unless the target thread has already
     terminated.

     On return from a successful pthread_join() call with a non-NULL value_ptr argument, the value passed to pthread_exit() by the terminating
     thread is stored in the location referenced by value_ptr.	When a pthread_join() returns successfully, the target thread has been terminated.
     The results of multiple simultaneous calls to pthread_join() specifying the same target thread are undefined.  If the thread calling
     pthread_join() is cancelled, then the target thread is not detached.

     A thread that has exited but remains unjoined counts against _POSIX_THREAD_THREADS_MAX.

RETURN VALUES

     If successful,  the pthread_join() function will return zero.  Otherwise an error number will be returned to indicate the error.

ERRORS

     pthread_join() shall fail if:

     [EINVAL]		The value specified by thread does not refer to a joinable thread.

     [ESRCH]		No thread could be found corresponding to that specified by the given thread ID, thread.

     pthread_join() may fail if:

     [EDEADLK]		A deadlock was detected or the value of thread specifies the calling thread.

SEE ALSO

     wait(2), pthread_create(3)

STANDARDS

     The function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

BSD
								   July 9, 2010 							       BSD
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