如何获取线程的Linux PID？

#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>

int main() {
    pid_t pid = getpid();
    printf("PID: %d\n", pid);
    return 0;
}

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

void* threadFunc(void* arg) {
    pthread_t tid = pthread_self();
    printf("Thread ID: %lu\n", tid);
    return NULL;
}

int main() {
    pthread_t thread;
    pthread_create(&thread, NULL, threadFunc, NULL);
    pthread_join(thread, NULL);
    return 0;
}

ps -eLf