Thread3

<main.c>

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

void* thread1_main(void *arg)
{
    int i;
    int cnt = *((int*)arg);

    for (i = 0; i < cnt; i++)
    {
        sleep(1); puts("running thread..1");
    }

    return (void*)10;
}

void* thread2_main(void *arg)
{
    int i;
    int cnt = *((int*)arg);

    for (i = 0; i < cnt; i++)
    {
        sleep(1); puts("running thread..2");
    }

    return (void*)20;
}

int main(int argc, char *argv[])
{
    pthread_t t1_id, t2_id;
    int thread_param = 2;
    int temp = 0;
    void* thr_ret;

    if (pthread_create(&t1_id, NULL, thread1_main, (void*)&thread_param) != 0)
    {
        puts("pthread_create() error");
        return -1;
    }

    if (pthread_create(&t2_id, NULL, thread2_main, (void*)&thread_param) != 0)
    {
        puts("pthread_create() error");
        return -1;
    }

    // 블로킹 함수 (t1_id가 끝날 때까지는 그 밑에 코드는 진행하지 않는다(대기))
    if (pthread_join(t1_id, &thr_ret) != 0)     
    {
        puts("pthread_join() error");
        return -1;
    }

    temp = *(int*)&thr_ret;
    printf("%d\n", temp);

    sleep(3); puts("end of main\n");

    return 0;
}

 

<compile 결과>