Is there some specific number of iterations, that I could make using a
for loop, so that it exactly takes 1 second for the loop to be executed completely? For example the following code took 0.125s on my machine to execute:
using namespace std;
long long a=0;
Though, a <= 8*pow(10,4) took 0.206 s. Compiler is GCC 4.9.2. IDE is codeblocks.
My PC's Specs: OS: Windows 8.1
Best How To :
I am posting this answer to my own question, as per the comments received.
It is not possible to make a timer because:
- The time that an iteration will take is unpredictable, this depends not only on the CPU used, but you need to take into account power management, the scheduler. (By tux3)
one would have to use a real time OS to accomplish that. There's too much jitter in non realtime OSs. Windows could decide to schedule other processes for a while, or use the CPU for e.g. kernel networking, disk I/O etc. that preempts the timing. (By nos)
One can't "make own timer" in a hosted environment just in standard C++. A timer is essentially a mechanism to communicate with the OS scheduler, and one needs platform-specific OS services for that. (By Kerrek SB)
The compiler would optimize such a loop and will remove it through dead-code elimination (By πάντα ῥεῖ and Jongware).