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


void *function1()
{
        printf("thread numbers(1-10): %ld\n",pthread_self());
}

void *function2()
{
        printf("thread number 11 : %ld\n",pthread_self());
}

int main()
{
        int i;
        pthread_t thread[10],thread11;
        for(i=0;i<10;i++)
        {
           pthread_create(&thread[i],NULL,&function1,NULL);
        }
        pthread_create(&thread11,NULL,&function2,NULL);
}

#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>

union semun {
            int val;
            struct semid_ds *buf;
            unsigned short  *array;
};

int semset_id;          /*set id*/
struct sembuf sem_op;   /*struct for operations*/

void *function1(void *arg)
{
        printf("thread numbers(1-10)\n");

        /* increase semaphore counter */
        sem_op.sem_num = 0;
        sem_op.sem_op = 1;
        sem_op.sem_flg = 0;
        semop(semset_id, &sem_op, 1);

        pthread_exit(NULL);
}

void *function2(void *arg)
{

        /* wait till semaphore value is 10 */
        sem_op.sem_num = 0;
        sem_op.sem_op = -10;
        sem_op.sem_flg = 0;
        semop(semset_id, &sem_op, 1);

        printf("thread number 11\n");

        pthread_exit(NULL);
}

int main()
{
        int i;
        pthread_t thread[10],thread11;
        union semun sem_val;            /* sem value */
        void *ret_val;

        semset_id = semget(IPC_PRIVATE, 1, 0600);       /* create set */
        if (semset_id == -1)
        {
                perror("Crap");
                exit(1);
        }

        sem_val.val = 0;
        semctl(semset_id, 0, SETVAL, sem_val);

        if (pthread_create(&thread11,NULL,function2,NULL) != 0)
        {
                perror("Create 11");
                exit(1);
        }

        for(i=0;i<10;i++)
        {
                if (pthread_create(&thread[i],NULL,function1,NULL) != 0)
                {
                        perror("Create");
                        exit(1);
                }

        }

        for (i = 0; i < 10; i++)
                pthread_join(thread[i], &ret_val);

        pthread_join(thread11, &ret_val);

        return 1;
}