#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>

class tClass1 {

   private :
      char* buf;

   public :
      void method(void) {
         buf = new char[100];
         while (1) {
            printf("This is thread 1\n");
            sleep(1);
         }
      }
      ~tClass1(void) {
         delete[] buf;
         printf("Thread 1 exit\n");
      }

};

class tClass2 {

   private :
      char* buf;

   public :
         void method(void) {
            buf = new char[100];
            while (1) {
               printf("This is thread 2\n");
               sleep(1);
            }
         }
         ~tClass2(void) {
            delete[] buf;
            printf("Thread 2 exit\n");
         }

};

tClass1* pClass1;
tClass2* pClass2;
pthread_t pt1, pt2;

void* tFunc1(void* arg) {
   pClass1->method();
}

void* tFunc2(void* arg) {
   pClass2->method();
}

void hanSigInt(int sig) {
   printf("Got signal %d\n", sig);
   sleep(3);
   printf("Leave handle of signal\n");
}

void hanSigTerm(int sig) {
   printf("Got signal %d\n", sig);
   pthread_cancel(pt1);
   pthread_cancel(pt2);
   delete pClass1;
   delete pClass2;
   sleep(3);
   pthread_join(pt1, NULL);
   pthread_join(pt2, NULL);
   printf("Leave this program\n");
   exit(EXIT_SUCCESS);
}

int main(void) {
   daemon(1, 1);
   pClass1 = new tClass1;
   pClass2 = new tClass2;
   signal(SIGINT, hanSigInt);
   signal(SIGTERM, hanSigTerm);
   pthread_create(&pt1, NULL, tFunc1, NULL);
   pthread_create(&pt2, NULL, tFunc2, NULL);
   while (1) {
      printf("This is main\n");
      sleep(1);
   }
   exit(EXIT_SUCCESS);
}