clock

问题 The bug that annoys me is the same than this ticket. Basically, if you change the OS clock to a date in the past, all the thread that were sleeping at the time of the change won't wake up. The application I am developping is meant to be running 24/24, and we would like to be able to change the OS date without stopping it (for example, to switch from summer time to winter time). What happens for the moment is that when we change the date to the past, then some parts of the application just

问题 i have some clock script. Everything is fine and it's work perfectly but... i have one problem. If at the clock is set one digit hour or minute like 1:5 clock not adding "0" digit before. This what i'v done but it does't work. Can u help me, much thx? window.setInterval(function update_clock() { var currentTime = new Date(); var currentHours = currentTime.getHours(); var currentMinutes = currentTime.getMinutes(); $.ajax({ success: function (clock) { document.getElementById("hour").firstChild

问题 I want to create an incrementing second timer like a stopwatch. So I want to be able to display the seconds and minutes incrementing in the format 00:01... Google only brings up 24 hour clock examples, I was wondering could anyone get me started with an example or tutorial of what I want to do? Edit: Here is what I have using the Chronometer in Android so far In onCreate() secondsT = 0; elapsedTimeBeforePause = 0; stopWatch.start(); startTime = SystemClock.elapsedRealtime(); stopWatch.setBase

问题 First off, this is a simple question that I'm stuck on in my Java 1 class. It's a static time that I set already as 8:49:12 "today" and I'm to figure out how many seconds past midnight and "to" midnight this represents. 8 hours, 49 minutes, and 12 seconds. Here is my code now: hour = 8; minute = 59; second = 32; System.out.println("The static time used for this program was: " + hour + ":" + minute + ":" + second); My issue is that I have no clue on how to get the time from and since midnight.

问题 What is the best way to exit out of a loop as close to 30ms as possible in C++. Polling boost:microsec_clock ? Polling QTime ? Something else? Something like: A = now; for (blah; blah; blah) { Blah(); if (now - A > 30000) break; } It should work on Linux, OS X, and Windows. The calculations in the loop are for updating a simulation. Every 30ms, I'd like to update the viewport. 回答1: The code snippet example in this link pretty much does what you want: http://www.cplusplus.com/reference

问题 I am trying to calculate the number of ticks a function uses to run and to do so an using the clock() function like so: unsigned long time = clock(); myfunction(); unsigned long time2 = clock() - time; printf("time elapsed : %lu",time2); But the problem is that the value it returns is a multiple of 10000, which I think is the CLOCK_PER_SECOND . Is there a way or an equivalent function value that is more precise? I am using Ubuntu 64-bit, but would prefer if the solution can work on other

问题 At the top and end of my program I use clock() to figure out how long my program takes to finish. Unfortunately, it appears to take half as long as it's reporting. I double checked this with the "time" command. My program reports: Completed in 45.86s Time command reports: real 0m22.837s user 0m45.735s sys 0m0.152s Using my cellphone to time it, it completed in 23s (aka: the "real" time). "User" time is the sum of all threads, which would make sense since I'm using OpenMP. (You can read about

问题 We want to run a task every 1000 seconds (say). So we have timer.scheduleAtFixedRate(task, delay, interval); Mostly, this works fine. However, this is an embedded system and the user can change the real time clock. If they set it to a time in the past after we set up the timer, it seems the timer doesn't execute until the original real-time date/time. So if they set it back 3 days, the timer doesn't execute for 3 days :( Is this permissible behaviour, or a defect in the Java library? The

问题 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. 回答1: CACurrentMediaTime & mach_absolute

问题 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. 回答1: CACurrentMediaTime & mach_absolute