c++ how to set a certain amount of time a process runs for?

Question

Just wondering how i want to make my program run for 60 seconds then exit. can anyone supply me with some example code, thanks.

Answer 1

Don't smoke your CPU with a while(clock() < time) kinds of loops.



Depending on your compiler and OS, you can run your code on a separate thread while sleeping in main() or set up a timer:



thread solutions:



C++0x (the newest revision of the C++ language):



#include

void process()

{

     // your code goes here

}

int main()

{

     std::thread t(process);

     std::this_thread::sleep_for( std::chrono::minutes(1) );

}



(tested with gcc 4.4.5)



C++98 (the oldest revision of the C++ language) with boost libraries (www.boost.org)



#include

void process()

{

     // your code goes here

}

int main()

{

     boost::thread t(process);

     boost::this_thread::sleep( boost::posix_time::minutes(1) );

}



C++98 on a POSIX OS (such as Linux)



#include

#include

void* process(void* arg)

{

     // your code goes here

     return arg;

}

int main()

{

     pthread_t id;

     pthread_create(&id, NULL, process, NULL);

     sleep(60);

}



C++98 on Windows OS



#include

DWORD WINAPI process(void)

{

     // your code here

     return 0;

}

int main()

{

     DWORD id;

     CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) process, NULL, 0, &id);

     Sleep(60*1000);

}



alarm timer solutions:



C++98 on a POSIX OS



#include

#include

#include

int main()

{

     timer_t timerid;

     timer_create(CLOCK_REALTIME, NULL, &timerid);

     itimerspec its = {{0, 0}, {60, 0}};

     timer_settime(timerid, 0, &its, NULL);

     // your code goes here.

}



I think Windows has its own timer event, WM_TIMER, too, but that's enough for one post.

Answer 2

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Answer 3

#include



int main()

{

    clock_t end_time = clock() + 60 * CLOCKS_PER_SEC;



    while(clock() < end_time)

    {

        // your code here

    }

}



If your code is more linear in nature, and you don't want to constantly check the time, you just want to end your program abruptly, you can use threads. Here's an example using boost, which if you don't have, you should. http://www.boost.org/



#include

#include



#include



void threadmain()

{

    // Your main program here

}



int main()

{

    boost::thread th(threadmain);



    clock_t end_time = clock() + 5 * CLOCKS_PER_SEC;

    while(clock() < end_time)

    {}

// program ends abruptly, whether the other thread is done or not

}