/* Compile Using:
gcc -lpthread -Werror -Wall thread-create_return.c -o thread-create_return
*/
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>     /* srand, rand */
#include <unistd.h>

long int sharedNumber=0; 
     
void* childThread (void* threadID)
{	int i;
	sleep((long)threadID);// REMOVE SLEEP() TO SEE THE EFFECT OF RACE CONDITION
	for(i=0;i<1000000;i++)sharedNumber++;
    printf ("Thread: Child Thread %ld has computed RANDOM NUMBER: %ld\n", (long)threadID,sharedNumber);
    pthread_exit((void*)sharedNumber); // Return a Value to Main: Parent
}
/* The main program. */
int main ()
{
    pthread_t thread_id[10];	/* Store the threadIDs in an array */
    long threadCount;
	void *status;
    /* Create a new thread. The new thread will run the print_xs  function. */
    for (threadCount = 1; threadCount< 10; threadCount++){
        pthread_create (&thread_id[threadCount], NULL, &childThread, (void *)threadCount);
		printf ("Parent has created thread %ld with thread_id %u \n", threadCount, (unsigned int)thread_id[threadCount]);
		//pthread_join(thread_id[threadCount], NULL); /* Join immediately after creation of the thread */
		}
	printf ("Main: Parent has CREATED ALL thread.\n");
	for (threadCount = 1; threadCount< 10; threadCount++){ /* Join after all thread creation */
		pthread_join(thread_id[threadCount], &status);
		printf("Main: completed join with thread %ld having a status of %ld\n",threadCount,(long)status);
	}			
	printf ("Parent has WAITED FOR ALL thread to finish.\n");	
    //sleep(1);
    return 0;
}