clock

The C clock() function just returns me a zero. I tried using different types, with no improvement... Is this a good way to measure time with good precision? #include <time.h> #include <stdio.h> int main() { clock_t start, end; double cpu_time_used; char s[32]; start = clock(); printf("\nSleeping 3 seconds...\n\n"); sleep(3); end = clock(); cpu_time_used = ((double)(end - start)) / ((double)CLOCKS_PER_SEC); printf("start = %.20f\nend = %.20f\n", start, end); printf("delta = %.20f\n", ((double) (end - start))); printf("cpu_time_used = %.15f\n", cpu_time_used); printf("CLOCKS_PER_SEC = %i\n\n",

CLOCK_MONOTONIC does not seem available, so clock_gettime is out. I've read in some places that mach_absolute_time() might be the right way to go, but after reading that it was a 'cpu dependent value', it instantly made me wonder if it is using rtdsc underneath. Thus, the value could drift over time even if it is monotonic. Also, issues with thread affinity could result in meaningfully different results from calling the function (making it not monotonic across all cores). Of course, that is just speculation. Does anyone know how mach_absolute_time actually works? I'm actually looking for a

I'm a beginner AngularJS/html user who's been trying to find a code snippet to make a clock/time item for a web app. A web search did not provide straight-forward results as easily as I would expect them for something so trivial, so I thought I would post this question to get some answers and also make this easier to find for others. I have posted my solution but want to see if there is anything nicer out there before choosing an answer! Just trying to improve Armen's answer. You can use the $interval service to setup a timer. var module = angular.module('myApp', []); module.controller(

I've looked around and nothing seems to be working from what I've tried so far... @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.deskclock); TextView tvTime = (TextView) findViewById(R.id.tvTime); TextView tvDate = (TextView) findViewById(R.id.tvDate); java.util.Date noteTS = Calendar.getInstance().getTime(); String time = "hh:mm"; // 12:00 tvTime.setText(DateFormat.format(time, noteTS)); String date = "dd MMMMM yyyy"; // 01 January 2013 tvDate.setText(DateFormat.format(date, noteTS)); I basically want the setText

I've got something like this: clock_t start, end; start=clock(); something_else(); end=clock(); printf("\nClock cycles are: %d - %d\n",start,end); and I always get as an output "Clock cycles are: 0 - 0" Any idea why this happens? (Just to give little detail, the something_else() function performs a left-to-right exponentiation using montgomery representation, moreover I don't know for certain that the something_else() function does indeed take some not negligible time.) This is on Linux. The result of uname -a is: Linux snowy.*****.ac.uk 2.6.32-71.el6.x86_64 #1 SMP Fri May 20 03:51:51 BST 2011

I have just written this short C++ program to approximate the actual number of clock ticks per second. #include <iostream> #include <time.h> using namespace std; int main () { for(int i = 0; i < 10 ; i++) { int first_clock = clock(); int first_time = time(NULL); while(time(NULL) <= first_time) {} int second_time = time(NULL); int second_clock = clock(); cout << "Actual clocks per second = " << (second_clock - first_clock)/(second_time - first_time) << "\n"; cout << "CLOCKS_PER_SEC = " << CLOCKS_PER_SEC << "\n"; } return 0; } When I run the program, I get output that looks like this. Actual

A common exploit in casual games is to artificially advance the system clock to jump ahead in gameplay. How can such user clock advancement be detected by an app on an iOS device? Must not involve network communication Must not assume app is open (running or suspended) while clock is advanced Must detect clock advancement, detecting clock rollback is not sufficient Ideally, the solution would be robust against reboots, but that is not a requirement. Lio CACurrentMediaTime & mach_absolute_time Take a look at this questions: iOS: How to measure passed time, independent of clock and time zone