如何在c++中子线程-pthread之前执行父线程

#include <iostream>
#include <pthread.h>

void* childThreadFunc(void* arg) {
    // 子线程的逻辑代码
    std::cout << "This is the child thread." << std::endl;
    return NULL;
}

int main() {
    pthread_t childThread;
    
    // 创建子线程
    pthread_create(&childThread, NULL, childThreadFunc, NULL);
    
    // 父线程的逻辑代码
    std::cout << "This is the parent thread." << std::endl;
    
    // 等待子线程结束
    pthread_join(childThread, NULL);
    
    return 0;
}