#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); 
} 

#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, 34); 
  } 
} 
 
main() 
{ 
  signal(34, handle); 
  sigemptyset(&sigs); 
  sigaddset(&sigs, 34); 
   
  pthread_create(&t1, 0, r1, 0); 
  pthread_create(&t2, 0, r2, 0); 
 
  while(1); 
}