Linux thread synchronization signal C language instance _c language

Linux sends a signal to a thread, and if there is no handler function for the signal, the program ends.
As in the following program, creating a thread that sends a signal to the main thread can cause the program to end immediately

#include <stdio.h> 
#include <pthread.h> 
 
pthread_t t; 
 
void* run (void* Arg) 
{while 
  (1) 
  { 
    printf ("hello\n"); 
  } 
} 
 
Main () 
{ 
  pthread_create (&t, 0, run, 0); 
  Pthread_kill (t,34); 
  while (1); 

This requires that the use of Pthread_kill and sigwait to control the thread by waiting for the signal should be added a signal processing function to achieve the control of the thread
Improved control thread routines

#include <stdio.h> 
#include <pthread.h> 
#include <signal.h> 
 
pthread_t t1, T2; 
sigset_t sigs; 
 
void handle (int s) 
{ 
} 
 
void* R1 (void* Arg) 
{ 
  int s; 
  while (1) 
  { 
    printf ("1\n"); 
    Sigwait (&sigs, &s); 
  } 
 
void* R2 (void* Arg) 
{while 
  (1) 
  {sleep 
    (1); 
    printf ("2\n"); 
    Pthread_kill (t1); 
  } 
 
Main () 
{ 
  signal (handle); 
  Sigemptyset (&sigs); 
  Sigaddset (&sigs); 
   
  Pthread_create (&t1, 0, R1, 0); 
  Pthread_create (&t2, 0, r2, 0); 
 
  while (1); 
} 

Part of the effect