/****************************************************************
 * Chatzidimitriou Athanasios 050064				*
 * Askisi 2							*
 * Compile : gcc -pedantic -lpthread -Wall ask2.c -o ask2	*
 ****************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h> 	/*sleep() definition */
#include <malloc.h>

void *thread_function(void*);

int main(void)
{
	int 	  i, thrcount;
	pthread_t *thr;

	printf("Number of threads: "); scanf("%d",&thrcount);
	thr = (pthread_t*)malloc(thrcount*sizeof(pthread_t));

	for (i = 0; i < thrcount; i++)
			pthread_create(&thr[i],NULL,thread_function,(void*)(i+1));
	for (i = 0; i < thrcount; i++)
		pthread_join(thr[i],NULL);

	return EXIT_SUCCESS;
}

void *thread_function(void *arg)
{
	int i, num;
	num = (int)arg;
	for (i = 1; i <= num; i++)
		printf("Hello from thread %d\n",num);
	sleep(num);
	pthread_exit(NULL);
}