Linux多线程学习（四）pthread_self

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xiaoyeyopulei

7426人浏览 · 2012-09-10 15:00:31

xiaoyeyopulei · 2012-09-10 15:00:31 发布

原型：

#include <pthread.h>
pthread_t pthread_self(void);

说明：
获取本进程自身的 ID。进程 ID 类型是 pthread_t ，这个类型一般为long long 型，8个字节。

测试代码：

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

void *thread_one ()
{

printf ("thread_one pid is %lld\n", getpid());
    printf ("thread_one tid is %lld\n", pthread_self());
}

void *thread_two()
{

  printf ("thread_two pid is %lld\n", getpid());
    printf ("thread_two tid is %lld\n", pthread_self());
}

int main (int argc, char **argv)
{
    pid_t pid;
    pthread_t tid_one, tid_two;

    if ((pid = fork()) == -1) {
        perror ("fork");
        exit (EXIT_FAILURE);
    } else if (pid == 0) {
        pthread_create (&tid_one, NULL, (void *)thread_one, NULL);
        pthread_join (tid_one, NULL);
    } else {
        pthread_create (&tid_two, NULL, (void *)thread_two, NULL);
        pthread_join (tid_two, NULL);
    }

    wait (NULL);

return 0；
}

编译 gcc -o pthread_self -lpthread pthread_self.c

运行结果：thread_one pid is 17480
thread_one tid is -1208779872
thread_two pid is 17479
thread_two tid is -1208779872