• C timer milliseconds

    C timer milliseconds

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    Manage your Cookies Settings. Join Now login. Ask Question. Does it have any header file to include to produce time in milli seconds.

    c timer milliseconds

    Please mail me if any of u know. Thank you. Oct 17 ' Post Reply. Share this Question. Expand Select Wrap Line Numbers. You may try the "gettimeofday" function. It reports the time down to microsecond level.

    Would u tell me the header files and functions in c required or else an example c program. Oct 24 ' But it doesnot works in linux. I need header files which is included in linux. Would u help me pls Please refer to my previous post mentioning the gettimeofday function. It will provide what you need.

    Apr 12 ' Similar topics getting current timestamp in micro secs getting current timestamp PERL: How to get current time to the Millisecond resolution Getting current time in seconds Getting the current time and format it to an own format? How to check current time for demonstration product current time with ctime current time Adding current time in field with toggle button. Question stats viewed: replies: 8 date asked: Oct 17 '06 Follow this discussion. Follow us to get the Latest Bytes Updates.

    Getting current time with milliseconds P: Harika hi all, I want to take current time with milli seconds in C. Oct 17 '06 Post Reply. Oct 17 '06 reply. P: Banfa Would u tell me the header files and functions in c required or else an example c program. Oct 24 '06 reply. Cancel Changes.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

    Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I also want the code to be portable, so operating specific functions are out. You state that operating specific functions are outwhich I assume means that you don't want to use operating system specific system functions.

    However in this particular case that is actually hindering you from actually solving your task, as POSIX-based systems and Windows-based systems has two different ways of handling this. Although the ftime is present in various operating system, it has been marked as obsolete as of POSIX. This function is obsolete. Don't use it. In other words, if you want to do this correctly for use in various operating systems, you do need to make it operating system dependent. If you choose to carry on with your solution using the obsolete ftime more could surely be said, but here are some comments on your actual code:.

    Decide on one style of bracing — Decide whether you want to have opening braces on the start of the line, or end of preceding line, and stick to it. Mixing like you've done here make your code somewhat harder to read, and when mixing with empty block aka the busy loop with missing braces, it is not good.

    Some guys advocate a different opening brace style for functions versus other blocks, but I would suggest using the same style for everything making it more consistent. It was proposed to be included in C11 see N This was revised in N, 7. N is the latest draft available, before the standard was defined and made commercially available. From this I quote:. I answered a similar question on Stack Overflow.

    I wanted a timestamp in a specific format, that could be obtained from a function repeatedly. My implementation is different than the original posters, for very specific reasons. The goal is thus to create a simple timestamp structure and a function that can create it repeatedly without arguments. I think the function below does that. A timestamp function should return a timestamp. Such details should be hidden from the user. Avoid the other deprecated functions such as gettimeofday.

    As someone said earlier, ftime is not the function to use, and neither is gettimeofday. I think the code below is mostly portable. I think the trick with timestamp functions is not so much portability, but avoiding the unnecessary usage of dynamically allocated memory.

    I think this is important because for embedded environments several rules preclude the usage of such C constructs.

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    Furthermore calling malloc and new are expensive operations, not good when looking for millisecond precision. My implementation could be tightened up considerably by removing the calls to the sprintf format functions and replacing them with something custom, but the general idea is there. Some caveats: 1 Make sure you set the time on your embedded board.Anyone who has used the. NET System. Timer class for low interval times will realise that it does not offer a very high resolution.

    Microsecond and Millisecond C# Timer

    The resolution will be system dependant, but a maximum resolution is usually around 15ms System. Timer has an even worse resolution, although it is unlikely a UI will need to be updated this fast.

    Significantly better performance can be achieved using the Win32 multimedia timer there are various. NET projects that wrap this timer ; however, there are no timers available in the microsecond range.

    Basically, what I needed was a microsecond timer that was accurate the majority of the time. The fundamental problem with a software timer in the region of 1ms is that Windows is a non real-time Operating System RTOS and is not suitable for generating regular and accurate events around the 1ms mark.

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    MicroTimer cannot and does not solve this problem; however, it does offer a microsecond timer which offers a reasonable degree of accuracy approx.

    The trouble is, the 0. The beauty of MicroTimer is that it is called in a very similar way to the existing System. Timer class; however, the interval is set in microseconds as opposed to milliseconds in System. The MicroTimerEventArgs properties provide information to the microsecond on when exactly and how late the timer was invoked.

    By design, the amount of work done in the callback function OnTimedEvent must be small e. To that end, the work done in the callback function must take significantly less time than the timer interval.

    Separate threads could be spawned for longer tasks; however, this goes outside the scope of this article. As discussed earlier, because Windows is not a real time Operating System, the callback function OnTimedEvent may be late; if this happens and any particular interval is delayed, there are two options:.

    The code below shows the MicroLibrary namespace MicroLibrary. See the 'Download source' link above. See the 'Download Console demo project' link above. The screenshot below shows the console output. Due to system caching, the accuracy was worse on the first run and got better after the first few events. The performance improved significantly on faster machines.

    MLB - Reactions in milliseconds

    It is very unlikely a UI will need to be updated at intervals in the millisecond range. Purely for the point of demonstration, the 'Download WinForms demo project' link above contains a very simple WinForms application that updates a UI using the MicroTimer. MicroTimer is designed for situations were a very quick timer is required around the 1ms mark ; however, due to the non real-time nature of the Windows Operating System, it can never be accurate.

    However, as no other microsecond software timers are available, it does offer a reasonable solution for this task and although processor hungry, is reasonably accurate on fast systems.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

    Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm making a program in which I need to get the time in milliseconds. By time, I mean a number that is never equal to itself, and is always numbers bigger than it was a second ago. I've tried converting DateTime. Now to a TimeSpan and getting the TotalMilliseconds from that Use the Stopwatch class.

    Provides a set of methods and properties that you can use to accurately measure elapsed time. This is actually how the various Unix conversion methods are implemented in the DateTimeOffset class. NET Framework 4. NET Standard 1. The DateTime.

    Ticks property gets the number of ticks that represent the date and time. I use the following class. I found it on the Internet once, postulated to be the best NOW. You can try the QueryPerformanceCounter native method. This is what the Stopwatch class uses. See How to get timestamp of tick precision in. I used DateTime. TotalMilliseconds for current dayhope it helps you out as well. Use System. That puts your reading in a known reference-based millisecond format that totally eliminates day change, etc.

    Learn more. Get time in milliseconds using C Ask Question. Asked 9 years, 11 months ago. Active 1 year, 4 months ago. Viewed k times. Is there an easier way to do this?

    Peter Mortensen Entity Entity 7, 18 18 gold badges 67 67 silver badges bronze badges. Are you expecting any two calls to always lead increasing values?

    c timer milliseconds

    In general, calls closer than the minimum interval that the timer resolution allows will yield the same value. You would need to add your own tiebreaker in the form of a fake-precision serializer. That sounds NaN would fit that requirement actually. Despite being "not a number", it is a number type, and it is not equal to itself.

    Active Oldest Votes. RedFilter RedFilter k 33 33 gold badges silver badges bronze badges.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Start and stop times are the same. Does it mean that the program hardly takes time to complete execution?

    Is my logic correct? Note: I need to calculate the time taken for execution, and hence the above code. Yes, this program has likely used less than a millsecond. Try using microsecond resolution with timeval. You can then query the difference in microseconds between stop.

    c timer milliseconds

    You're not specifying how fast your machine is, but it's not unreasonable for this to run very quickly on modern hardware, no. So there is no indication you should treat it as milliseconds. Man times suggests that will be an int. Also note that:. And if you are unlucky you might hit the moment it is just about to start counting from zero, thus getting negative or huge value depending on whether you store the result as signed or unsigned value.

    Will most probably print garbage as treating any int as float is really not defined behaviour and I think this is where most of your problem comes. If you want to make sure you can always do:. Modern processors are too fast to register the running time.

    Hence it may return zero. In this case, the time you started and ended is too small and therefore both the times are the same after round of. Learn more. Time in milliseconds in C Ask Question. Asked 8 years, 5 months ago. Active 11 months ago. Viewed k times. It is also or could be operating system- and computer- specific.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

    Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

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    This means it may be removed from a future version of the specification. Since the long representation of time is not relevant to or effected by timezone itself, so setting tz param of gettimeofday is not necessary, since it won't make any difference.

    Time delay in C

    And, according to man page of gettimeofdaythe use of the timezone structure is obsolete, thus the tz argument should normally be specified as NULL, for details please check the man page. Use gettimeofday to get the time in seconds and microseconds. Combining and rounding to milliseconds is left as an exercise.

    It is already implemented in Ubuntu Learn more. How to get the current time in milliseconds from C in Linux? Ask Question. Asked 10 years ago. Active 23 days ago. Viewed k times. How do I get the current time on Linux in milliseconds?

    Active Oldest Votes. Raedwald Dan Moulding Dan Moulding k 19 19 gold badges 87 87 silver badges 95 95 bronze badges. The OP doesn't want the time with milliseconds, but the time in milliseconds. Good solution but don't forget the -lm in your gcc command. You need to use floor instead of round so that it never rounds up to ms.

    Otherwise you would need to increment s when this happens.

    Timer Class

    Probably a rare event but the extra digit can cause trouble. Mike Nice catch.

    c timer milliseconds

    At one in two thousand, it's not even that rare, so should definitely be fixed. Rather than use floor, I think I'd prefer to maintain a little more accuracy and continue to round, but increment the second counter if it rounds up to Update - timezone Since the long representation of time is not relevant to or effected by timezone itself, so setting tz param of gettimeofday is not necessary, since it won't make any difference.

    Andrii Omelchenko Eric Wang Eric Wang You are wrong. Time zone should be introduced exclusively via call to localtime. There was no reason to do any test.Remember Me? Thread: Timer with milliseconds.

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    Timer with milliseconds. Hi guys Can you help me with this program. Actually I got 2 requests. How do I time the milliseconds too in this program? For millisecond resolution in timing, search google. There are plenty of examples of this. Use the function strcmp for comparing strings in c. Originally Posted by twomers. You can't get milliseconds with Standard C.

    So it depends which OS you are using. Bye, Andreas. Yes Im using Windows. As Andreas - yes this time the quote was right -said this is not included in standard C. So by googling Code:. Unfortunately it's clumsy. On Windows, the better option is to use GetTickCount. Make sure you store the result in an unsigned variable and be careful how you look for elapsed time.

    It you do it wrong then it will not work properly once a month or so. Post your attempt so we can check it. My homepage Advice: Take only as directed - If symptoms persist, please see your debugger Linus Torvalds: "But it clearly is the only right way. The fact that everybody else does it some other way only means that they are wrong". Similar Threads Milliseconds? Replies: 4 Last Post:PM. By nethunter in forum C Programming. Replies: 2 Last Post:PM.

    Replies: 5 Last Post:PM. Replies: 13 Last Post:PM.


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