How to trigger threads at specific system time under linux with C/C ?-CodePudding

As mentioned in title, how can I execute the specific threads at specific time accurately?
Is there any library help to do it?
For example, [00:00:00.00, 00:05:00.00, 00:10:00.00..04:00:00.00, 04:05:00.00...]

CodePudding user response：

Use timer_create with SIGEV_THREAD and set repeating time in timer_set to start a new thread at a repeated time interval.

CodePudding user response：

One simple way is to have a while(true) loop which calls sleep(1); and then in the loop checks what time it is with time(NULL) and if the time for a thread is past due, start the corresponding thread.

CodePudding user response：

One simple way is using time() to get the time:

#include <stdio.h>
#include <time.h>
void *get_sys_stat(void* arg)
{
        // Do somthing hrear
}

int main()
{
  hour = 5;
  min = 30;
  int status = 0;
  time_t t = time(NULL);
  pthread_t sys_stat_thread; 
  
  while(1) {
  /* Get time*/
  struct tm tm = *localtime(&t);
     
  /* Trigger another process or thread */  
  if ((tm.tm_hour == hour) && (tm.tm_min == min))
      pthread_create(&sys_stat_thread, NULL, get_sys_stat, NULL);
  }

}