A question about _thread_ of Linux

["cheng long" <kevinclcn@xxxxxxxxx>]

Hi,

As we know, Linux implements thread as process, and a thread is merely
a process that shares certain resources with other processes.

But why the threads print the same process id?
Code like this:

void* print_pid(void* noused)
{
        printf("%u\n",getpid());

        return NULL;
}

int main()
{
        printf("%u\n",getpid());

        pthread_t thread_id;

        int ret=pthread_create(&thread_id, NULL, &print_pid, NULL);
        if(ret != 0 ){
                return 1;
        }

        pthread_join(thread_id, NULL);

        return 0;
}

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