如何在C中创建两个线程？

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

void* thread_func1(void* arg) {
    printf("Thread 1\n");
    return NULL;
}

void* thread_func2(void* arg) {
    printf("Thread 2\n");
    return NULL;
}

int main() {
    pthread_t thread1, thread2;

    // 创建线程1
    if (pthread_create(&thread1, NULL, thread_func1, NULL) != 0) {
        printf("Failed to create thread 1\n");
        return 1;
    }

    // 创建线程2
    if (pthread_create(&thread2, NULL, thread_func2, NULL) != 0) {
        printf("Failed to create thread 2\n");
        return 1;
    }

    // 等待线程1和线程2结束
    pthread_join(thread1, NULL);
    pthread_join(thread2, NULL);

    return 0;
}