#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
void *sigone_program(void *arg);
void *sigtwo_program(void *arg);
void report(int);

int main(int argc,char *argv[])
{
    int i;
    void *status;
    pthread_t thread_one,thread_two;
    if(pthread_create(&thread_one,NULL,sigone_program,NULL)!=0)
    {
        fprintf(stderr,"pthread_create failure\n");
        exit(EXIT_FAILURE);
    }
    if(pthread_create(&thread_two,NULL,sigtwo_program,NULL)!=0)
    {
        fprintf(stderr,"pthread_create failure\n");
        exit(EXIT_FAILURE);
    }
    sleep(1);
    printf("this is parent, send SIGUSR1, SIGUSR2 to thread %u\n",thread_one);
    if(pthread_kill(thread_one,SIGUSR1)!=0)
    {
        perror("pthread_kill");
        exit(EXIT_FAILURE);
    }
    if(pthread_kill(thread_one,SIGUSR2)!=0)
    {
        perror("pthread_kill");
        exit(EXIT_FAILURE);
    }
    printf("this is parent, send SIGUSR1, SIGUSR2 to thread %u\n",thread_two);
    if(pthread_kill(thread_two,SIGUSR1)!=0)
    {
        perror("pthread_kill");
        exit(EXIT_FAILURE);
    }
    if(pthread_kill(thread_two,SIGUSR2)!=0)
    {
        perror("pthread_kill");
        exit(EXIT_FAILURE);
    }
    sleep(1);
    if(pthread_kill(thread_one,SIGKILL)!=0)
    {
        perror("pthread_kill");
        exit(EXIT_FAILURE);
    }
    if(pthread_kill(thread_two,SIGKILL)!=0)
    {
        perror("pthread_kill");
        exit(EXIT_FAILURE);
    }
    pthread_join(thread_two,NULL);
    pthread_join(thread_one,NULL);
    return 0;
}
void *sigone_program(void *arg)
{
    int i;
    __sigset_t set;
    signal(SIGUSR1,report);
    sigfillset(&set);
    sigdelset(&set,SIGUSR2);
    pthread_sigmask(SIG_SETMASK,&set,NULL);
    for(i=0;i<5;i++)
    {
        printf("this is set mask %u thread\n",pthread_self());
        pause();
    }
}

void report(int sig)
{
    printf("\nin signal, the sig=%d\t, the thread id=%u\n",sig,pthread_self());
}

void *sigtwo_program(void *arg)
{
    int i;
    signal(SIGUSR2,report);
    for(i=0;i<5;i++)
    {
        printf("this is no set mask %u thread\n",pthread_self());
        pause();
    }
}