cpp condition_variable wait_for unique_mutex,chrono::seconds

#include <chrono>
#include <condition_variable>
#include <ctime>
#include <fstream>
#include <future>
#include <iomanip>
#include <iostream>
#include <thread>
#include <uuid/uuid.h>
#include <vector>

char *uuid_value = (char *)malloc(40);
char *get_uuid_value()
{
    uuid_t new_uuid;
    uuid_generate(new_uuid);
    uuid_unparse(new_uuid, uuid_value);
    return uuid_value;
}

std::string get_time_now()
{
    std::chrono::time_point<std::chrono::high_resolution_clock> now = std::chrono::high_resolution_clock::now();
    time_t raw_time = std::chrono::high_resolution_clock::to_time_t(now);
    struct tm tm_info = *localtime(&raw_time);
    std::stringstream ss;
    ss << std::put_time(&tm_info, "%Y%m%d%H%M%S");
    auto seconds = std::chrono::duration_cast<std::chrono::seconds>(now.time_since_epoch());
    auto mills = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch());
    auto micros = std::chrono::duration_cast<std::chrono::microseconds>(now.time_since_epoch());
    auto nanos = std::chrono::duration_cast<std::chrono::nanoseconds>(now.time_since_epoch());
    ss << "_"
       << std::setw(3) << std::setfill('0') << (mills.count() - seconds.count() * 1000)
       << std::setw(3) << std::setfill('0') << (micros.count() - mills.count() * 1000)
       << std::setw(3) << std::setfill('0') << (nanos.count() - micros.count() * 1000);
    return ss.str();
}


std::atomic<bool> _is_write_finished(false);
std::condition_variable _cv;
std::mutex _mtx;
void cv_atomic_write_file(const std::string &file_name)
{
    std::fstream w_file(file_name, std::ios::app);
    if (!w_file.is_open())
    {
        std::cout << "Create or open " << file_name << " failed!!!" << std::endl;
        return;
    }
    static std::uint64_t num = 0;
    int loops = 0;
    std::stringstream ss;

    while (!_is_write_finished.load(std::memory_order_seq_cst))
    {
        for (int i = 0; i < 100000; i++)
        {
            ss << ++num << "," << get_uuid_value() << std::endl;
        }
        w_file << ss.str();
        ss = std::stringstream();
        std::cout<<std::boolalpha<<"is_write_finished:"<<_is_write_finished<<","<< get_time_now() << ",loops:" << ++loops << ",num:" << num << std::endl;
    }
    w_file.close();
    std::cout << get_time_now() << ",finish id:" << std::this_thread::get_id() << ",in " << __FUNCTION__ << std::endl;
}

void cv_wait_for(const std::string&file_name,const int &wait_seconds)
{
    std::thread t1(cv_atomic_write_file,std::cref(file_name)); 
    std::unique_lock<std::mutex> _lk(_mtx);    
    _cv.wait_for(_lk,std::chrono::seconds(wait_seconds));
    _is_write_finished.store(true, std::memory_order_seq_cst);
    std::cout<<std::boolalpha<<"is_write_finished:"<<_is_write_finished<<std::endl; 
    t1.detach();
    std::cout << get_time_now() << ",finish id:" << std::this_thread::get_id() << ",in " << __FUNCTION__ << std::endl;
}

int main(int args, char **argv)
{
    // write_file_for_loops(argv[1],atoi(argv[2]));
    // future_get_for_len(atoi(argv[1]));
    // promise_set_value_future_get(atoi(argv[1]));
    // atomic_write_file_store(atoi(argv[1]), argv[2]);
    cv_wait_for(argv[1],atoi(argv[2]));
    std::cout << get_time_now() << ",id:" << std::this_thread::get_id() << " in " << __FUNCTION__ << std::endl;
}

g++-12 -std=c++2a -I. *.cpp -o h1 -luuid -lpthread

./h1 log2.txt 100