#include <stdio.h>
#include <pthread.h>
pthread_mutex_t Device_mutex ;
int count=0;
void thread_func1()
{
   while(1)
   {
       pthread_mutex_lock(&Device_mutex);
       printf("thread1: %d\n",count);
       pthread_mutex_unlock(&Device_mutex);
       count++;
       sleep(1);
   }
}
void thread_func2()
{
   while(1)
   {
       pthread_mutex_lock(&Device_mutex);
       printf("thread2: %d\n",count);
       pthread_mutex_unlock(&Device_mutex);
       count++;
       sleep(1);
   }
}
int main()
{
   pthread_t thread1, thread2;
   pthread_mutex_init(&Device_mutex,NULL);
   if(pthread_create(&thread1,NULL,(void*)thread_func1,NULL) == -1)
 {
  printf("create IP81 Thread error !\n");
  exit(1);
 }
 sleep(1);
 if(pthread_create(&thread2,NULL,(void *)thread_func2,NULL) == -1)
 {
  printf("create IP81_2 Thread error!\n");
  exit(1);
 }
 sleep(1);
 pthread_join(thread1,NULL);
 pthread_join(thread2,NULL);
 pthread_mutex_destroy(&Device_mutex);
 return 0;
}