thread_22

#include <stdlib.h>
#include <pthread.h>
#include <stdio.h>
#include <sched.h>
pthread_cond_t  cond;
pthread_mutex_t mp;
 void *consumer1(void *p)
 {
         pthread_mutex_lock(&mp);
                printf("wait>>>(1)\n");
                 pthread_cond_wait(&cond, &mp);
          pthread_mutex_unlock(&mp);
         printf("wake <<<(1)\n");
                return NULL;
 }
 void *consumer2(void *p)
 {
        pthread_mutex_lock(&mp);
                printf("wait>>>(2)\n");
                pthread_cond_wait(&cond, &mp);
        pthread_mutex_unlock(&mp);
        printf("wake <<<(2)\n");
                return NULL;
}
void *consumer3(void *p)
 {       
         pthread_mutex_lock(&mp);
                 printf("wait>>>(3)\n");
                 pthread_cond_wait(&cond, &mp);
        pthread_mutex_unlock(&mp);
         printf("wake <<<(3)\n");
                 return NULL;
 }
 int main(int argc, char *argv[])
 {       
        pthread_t  t1, t2, t3;
         int ret;
        struct sched_param sched;
         sched.__sched_priority = 10;
          
         pthread_cond_init(&cond, NULL);
         pthread_mutex_init(&mp, NULL);
         
        ret = pthread_create(&t1, NULL, consumer1, NULL);
        ret = pthread_create(&t2, NULL, consumer2, NULL);
        ret = pthread_create(&t3, NULL, consumer3, NULL);
         sleep(1);
         pthread_setschedparam(t2, SCHED_FIFO, &sched);
         sleep(1);
         pthread_cond_broadcast(&cond);
         sleep(6);
         printf("main returned\n");
      return 0;
}