Waiting X number of minutes

[zub44]

My question is similiar to the one recently posted about waiting for x milliseconds. I have an idea of how to make a program wait for X minutes, but I would like to hear others opinions or suggestions about how to do this. The following function works, but it continously has the processor checking the time, and Im wondering if there is a better way where the processor does nothing without getting into operating specific functions.


#include <time.h>[/color purple]

void[/color green] Wait_X_Minutes (double[/color green] num_min)
/*Program should wait X minutes without doing anything*/[/color blue]
{
clock_t[/color green] start_time;
double[/color green] lapsed_time;

start_time = clock();
for (;[/color red]
{
lapsed_time = (double)[/color green] (clock() - start_time)/CLOCKS_PER_SEC;
if (lapsed_time > num_min*60.0)
break;
}
}


Thanks
Zub

 

[Hammer]

Use a non-standard function, like sleep() in unistd.h or Sleep() in windows.h.

Any hard loop type sleep processing is going to be bad for you CPU usage.

 

[SandMacD]

The suspend() function posted in the "waiting for x milliseconds" could be easily adapted to use seconds as a parameter. I found it nescessary to use that function in my application when one similar to the one you suggest pushed my processor usage to 100%.