Threads = SIGSEV ?

[sendai]

I'm studing about thread and sometimes when I run this code i receive a SIGSEV
someone have some idea of wath is occuring?

gcc thread.c -o thread -pthread

#include <stdio.h>
#include <pthread.h>

int xip=0;
int main(){
int *thc;

//pthread_create(PID,thread arguments,Process begin,arguments)
pthread_create(&thc, NULL,newthread(),NULL);
printf("World\n");
exit(0);
} 

int *newthread(){
printf("Hello ");
return(0);
}

the return is

sendai@slack:~$ ./thread
Hello World
Segmentation fault
sendai@slack:~$ ./thread
Hello World
sendai@slack:~$ ./thread
Hello World
sendai@slack:~$ gdb thread
>run
Starting program: /home/sendai/thread
[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 2412)]
[New Thread 32769 (LWP 2414)]
[New Thread 16386 (LWP 2415)]
Hello World

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 16386 (LWP 2415)]
0x00000000 in ?? ()

[andryk]

try this one

int thc;
//pthread_create(PID,thread arguments,Process begin,arguments)
pthread_create(&thc, NULL,newthread(),NULL);

[sendai]

really thx