how to execute a particular code in c++ after every 1 minute

Question

I need to make something(i call it a scheduler) that checks the time of the sytem every minute and if the time has changed suppose it is 17:52 and the next moment it is 17:53so at 17:53 it calls a function logupdated

How do i make this simply i m not known to the mutex and all.

Thanks

First, decide: do you want to call a function every 1 minute or at every minute clock tick of your system time? These are different functions. — KillianDS, Apr 09 '12 at 12:28
Do you expect this program to run in the background of your system all the time? If you do, you may want to look at cron-jobs on unix, or writing a windows service with the .net framework on windows. Does the application do any work between calls to the logger? Are you writing a multi threaded process? — Darcy Rayner, Apr 09 '12 at 12:30
@KillianDS:considering it runs forever i would say every clock tick also i have got some functionality for the roatting logs as well — gandhigcpp, Apr 09 '12 at 12:31
@gandhigcpp: http://stackoverflow.com/questions/132971/what-is-the-windows-version-of-cron — David-SkyMesh, Apr 09 '12 at 12:35

score 7 · Accepted Answer · answered Apr 09 '12 at 12:39

7

I am not sure I understand the requirements, but your question reads "how to execute a particular code in c++ after every 1 minute", so, in c++11 you can do this:

#include <thread>
#include <chrono>

int main() {

  while (true) {
    std::this_thread::sleep_for(std::chrono::seconds(60));
    // call your c++ code
  }

}

answered Apr 09 '12 at 12:39

juanchopanza

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@KillianDS good point. I hadn't considered the duration of the task itself. I guess if there is any possibility of overlap, it should also run in a separate thread or process. – juanchopanza Apr 09 '12 at 13:00
:dont know what is c++ 11 may be an upgraded version however i have only got ansi c++ here with me and i m not sure if netbeans ide 7.1.1 has a support for it – gandhigcpp Apr 09 '12 at 13:01
@gandhigcpp c++11 is the new standard, so it ***is*** c++. However, there is little compiler support at the moment. GCC covers the code snippet I included, but look at @KillianDS's answer concerning `boost` alternatives. – juanchopanza Apr 09 '12 at 13:06
:there is an error at the statement std::this_thread<-at "this_thread" – gandhigcpp Apr 10 '12 at 05:49
:do i need to declare "this_thread" somewhere it gives me an error while testing it – gandhigcpp Apr 10 '12 at 05:52
@gandhigcpp `this_thread` is in the ``header. If the code snippet above doesn't compile as is, it could be that your compiler doesn't support this yet. – juanchopanza Apr 10 '12 at 05:58
:yes it does not compile as it it is what is the other way round , one thing more guys please dont take me wrong here i am a novice so i require a lil bit more help from u people – gandhigcpp Apr 10 '12 at 06:52
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/9906/discussion-between-gandhigcpp-and-juanchopanza) – gandhigcpp Apr 10 '12 at 10:56

score 3 · Answer 2 · answered May 07 '13 at 11:16

If you want the execution of the task to be independent of the main program flow, consider multithreading.

this example in C, should work also on C++ Note that some people think that I use pointers excessively, I agree, specially with multithreading, it can cause unsafe threads, thus data corruption or even worse, segmentation faults. However this is the only way to pass arguments to threads as far as I could find.

#include <pthread.h>
int main(int argc, char *argv[]) {
  pthread_t thread1;
  int variables=10;
  pthread_create( &thread1, NULL, scheduler, (void*)&variables);
  while(1){
    .... do stuff as main program.
  }
  return 0;
}

void *scheduler (void* variables) {
  int vars;
  int* p_vars = (int*) variables;
  vars = *p_vars;
  while (1){
    .. do scheduler stuff
    sleep (vars);
  }
}

how to execute a particular code in c++ after every 1 minute

2 Answers2