#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); 
}