pthread_self() --- 获取进程 ID

beyes

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 id is %lld\n", pthread_self());
}

void *thread_two()
{
    printf ("thread_two id 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_one, NULL);
        pthread_join (tid_two, NULL);
    }

    wait (NULL);
}

运行与输出：

 ./pthread_self
thread_one id is 3077766000
thread_one id is 3077766000