Subj : trying to learn pthreads
To   : comp.programming.threads
From : Beau  Elliott
Date : Fri Mar 18 2005 10:20 am

I am trying to learn how to use pthreads.  I am trying to use a struct
to get around only having one variable.  All I want to do is to use the
thread I create to read in a value, and then print the result in the
function that created the thread.  The below code was compiled using
the command:

g++ thread.cpp -o thread -lpthread

When I run the program, it prompts for the value to be read in, however
I get a segmentation fault afterwards...can anyone tell me why?
---
#include <pthread.h>
#include <stdio.h>

struct tdata{

	int level;
	int left[2];
	int right[2];
};

void *test(void *data){

	tdata *temp;
	temp = (struct tdata *)data;

	//printf("%d", temp->level);

	printf("Please type in an integer: ");
	scanf("%d", temp->level);

	pthread_exit(0);
}

int main(int argc, char *argv[]){

	struct tdata data;

	data.level = 0;
	data.whichside = 1;

	pthread_t id;

	pthread_create(&id, NULL, test, (void *) &data);

	pthread_join(id, NULL);

	printf("%d", data.level);

	return 0;

}

Thank you for your help!

Cephus

.