Scheduling in C++

scheduling.cpp

/* This program is to explain how to schedule tasks in C++
 *
 */
#include <iostream>
#include <string>
#include <time.h>
#include <iomanip>
#include <chrono>
#include <thread>
#include <unistd.h>

/*
 * To Convert Time string to epoch for scheduling
 */
int64_t toEpoch(const std::string timeStr)
{
    std::time_t time = std::time(nullptr);
    std::tm t = *std::localtime(&time); // FILL WITH NOW TIME VALUES OR DEFAULT VALUES

    std::istringstream is(timeStr);
    is >> std::get_time(&t, "%d/%m/%y %H:%M:%S"); // FILL WITH TIME ACCORDING TO STRING FORMAT

    std::time_t epoch = std::mktime(&t);
    return epoch;
}

/*
 * wait until now epoch is less than or euqal to startEpoch
 * When start epoch is less than or queal to now epoch
 * It will break this loop.
 */
void scheduleTask(const std::string &startTime, const std::string &endTime, bool &stop)
{
    auto startEpoch = toEpoch(startTime);
    auto endEpoch = toEpoch(endTime);

    while(std::chrono::duration_cast<std::chrono::seconds>(std::chrono::system_clock::now().time_since_epoch()).count() <= startEpoch)
    {
        sleep(1);
    }

    std::cout<< "Program Started, Do Something!";
  
    // Doing something...!
  
    stop = true;
}

int main()
{
    bool stop = false;
    // Start a schedule porgram in new thread without blocking it.
    std::thread(scheduleTask,"19/09/2020 14:01:50", "19/09/2020 14:00:00", stop).detach();


    // Wait for other thread to finished.
    while(!stop)
    {
        sleep(1);
    }

    return 0;
}