condition_variable ,wait for unique lock and time_duration,notify_all()

#include <algorithm>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <cstdint>
#include <execution>
#include <fstream>
#include <future>
#include <iomanip>
#include <iostream>
#include <map>
#include <memory>
#include <mutex>
#include <random>
#include <sstream>
#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);
    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());

    std::stringstream ss;
    ss << std::put_time(&tm_info, "%Y%m%d%H%M%S") << "_"
       << 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::mutex _mtx;
std::condition_variable _cv;
bool _is_cv_ok=false;

void action_unique_lock_wait()
{  
    static int num=0;
    while(!_is_cv_ok)
    {
        std::cout<<get_time_now()<<","<<++num<<","<<get_uuid_value()<<std::endl; 
        std::this_thread::sleep_for(std::chrono::milliseconds(100));
    } 
    std::cout<<get_time_now()<<",id:"<<std::this_thread::get_id()<<",in:"<<__FUNCTION__<<std::endl;
}

void cv_wait_for(const int&wait_seconds)
{
    std::unique_lock<std::mutex> _lk(_mtx);
    std::cout<<std::boolalpha<<get_time_now()<<",_is_cv_ok:"<<_is_cv_ok<<",in:"<<__LINE__<<std::endl;
    std::thread t1(action_unique_lock_wait);  
    _cv.wait_for(_lk,std::chrono::seconds(wait_seconds));    
    _is_cv_ok=true; 
    _lk.unlock();
    std::cout<<std::boolalpha<<get_time_now()<<",_is_cv_ok:"<<_is_cv_ok<<",in:"<<__LINE__<<std::endl;
    _cv.notify_all(); 
    t1.join();
    std::cout<<get_time_now()<<",id:"<<std::this_thread::get_id()<<",in:"<<__FUNCTION__<<std::endl;
}

int main(int args, char **argv)
{
    cv_wait_for(atoi(argv[1]));
    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 2