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#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <time.h>
 
struct snail_thread{
	int move;
	char snail_name[10];
	char owner[10];
};
 
int sum = 0;
 
void printval(void *ptr) {
	struct snail_thread *data;
	data = (struct snail_thread *) ptr;
 
	while(sum < 100) {
		sum += data->move;
		printf("%s moves %d mm, total: %d\n",data->snail_name, data->move, sum);
	}
 
	pthread_exit(0);
}
 
int main(void) {
	pthread_t t[6];
	struct snail_thread s[6];
	int i;
 
	srand(time(NULL));
 
	for(i = 0; i < 6; i++)
		s[i].move = rand() % ((5 + 1) - 1) + 1;
 
	strcpy(s[0].snail_name, "Snail A");
	strcpy(s[0].owner, "Jon");
 
	strcpy(s[1].snail_name, "Snail B");
	strcpy(s[1].owner, "Ben");
 
	strcpy(s[2].snail_name, "Snail C");
	strcpy(s[2].owner, "Mark");
 
	strcpy(s[3].snail_name, "Snail D");
	strcpy(s[3].owner, "Jon");
 
	strcpy(s[4].snail_name, "Snail E");
	strcpy(s[4].owner, "Mark");
 
	strcpy(s[5].snail_name, "Snail F");
	strcpy(s[5].owner, "Ben");
 
 
	for(i = 0; i < 6; i++)
		pthread_create(&t[i],NULL,(void *) &printval, (void *) &s[i]);
 
	for(i = 0; i < 6; i++)
		pthread_join(t[i], NULL);
 
	return (0);
}
 
 

prog.c: In function ‘main’:
prog.c:31:2: warning: implicit declaration of function ‘srand’ [-Wimplicit-function-declaration]
  srand(time(NULL));
  ^
prog.c:34:3: warning: implicit declaration of function ‘rand’ [-Wimplicit-function-declaration]
   s[i].move = rand() % ((5 + 1) - 1) + 1;
   ^
/home/wPRHgp/ccA4vDOr.o: In function `main':
prog.c:(.text.startup+0x136): undefined reference to `pthread_create'
prog.c:(.text.startup+0x159): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status

Standard output is empty