clock

问题 I want to use clock_nanosleep for waiting of 1 microsec.. As far as I understand, I have to give an absolute time as input. Is the following code okay in this case? deadline.tv_sec = 0; deadline.tv_nsec = 1000; clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &deadline, NULL); 回答1: As far as I understand, I have to give an absolute time as input. No, the flags argument allows you to choose relative or absolute time. You want clock_nanosleep(CLOCK_REALTIME, 0, &deadline, NULL); to specify one

问题 I'm drawing a non-traditional ring-clock in canvas. The time is represented by a second ring, second hand, minute ring, and hour ring. I am using webkit/mozRequestAnimationFrame to draw at the appropriate time. I would like to modify the second ring to animate to the next second quickly (125ms - 250ms) and with Quadratic easing (instead of that dreaded snap). Much like the Raphael JS Clock animates its second ring, except it uses different easing: http://raphaeljs.com/polar-clock.html JS

问题 I am uploading my OpenCL and Cuda code to hgpu.org because I don't have a graphics card on my laptop. When I upload my code I get the following error: make: Warning: File `main.cu' has modification time 381 s in the future make: warning: Clock skew detected. Your build may be incomplete. I know that clock skew is due to difference in my machines clock time and the server's clock time, so I synchronized my time with the server's. The OpenCL and C++ code is running fine now but the Cuda code is

问题 I am uploading my OpenCL and Cuda code to hgpu.org because I don't have a graphics card on my laptop. When I upload my code I get the following error: make: Warning: File `main.cu' has modification time 381 s in the future make: warning: Clock skew detected. Your build may be incomplete. I know that clock skew is due to difference in my machines clock time and the server's clock time, so I synchronized my time with the server's. The OpenCL and C++ code is running fine now but the Cuda code is

问题 I have been reading a book about the Computer's Processor. And i came across some of the terms like clock Ticks, clock Cycle and Clock Speed that i am finding very difficult to understand. I will be very thankful if someone can clarify this in a simple language. Thanks in advance ! 回答1: Clock Cycle is the speed of a computer processor, or CPU, is determined by the clock cycle, which is the amount of time between two pulses of an oscillator. Generally speaking, the higher number of pulses per

问题 I want to calculate time intervals (in 1/10th of 1 second) between some events happening in my program. Thus I use clock function for these needs like follows: clock_t begin; clock_t now; clock_t diff; begin = clock(); while ( 1 ) { now = clock(); diff = now - begin; cout << diff / CLOCKS_PER_SEC << "\n"; //usleep ( 1000000 ); }; I expect the program to print 0 for 1 second, then 1 for 1 sec., then 2 for 1 sec. and so on... In fact it prints 0 for about 8 seconds, then 1 for about 8 seconds

问题 This question already has answers here : How to get the CPU cycle count in x86_64 from C++? (4 answers) Closed last year . I have successfully written some inline assembler in gcc to rotate right one bit following some nice instructions: http://www.cs.dartmouth.edu/~sergey/cs108/2009/gcc-inline-asm.pdf Here's an example: static inline int ror(int v) { asm ("ror %0;" :"=r"(v) /* output */ :"0"(v) /* input */ ); return v; } However, I want code to count clock cycles, and have seen some in the

问题 The requirement is that have to detect if the system time of iPhone is changed by user manually. For that I have used NSNotificationCenter.defaultCenter().addObserver(self, selector: "timeChangedNotification:", name: NSSystemClockDidChangeNotification, object: nil) and func timeChangedNotification(notification:NSNotification){ println("Device time has been changed...") } But not getting the results. Also if this time is not changed means it is automatic time provided by network then have to

问题 I need to add a clock to a web page. The clock needs to be synchronized with a server but I really don't want to have it constantly check the server as the page will be open 24/7 on several PCs. Is there some way to get the time from the server and then use the systems clock to keep it updated and check the server every 15 minutes or so to keep it synced? 回答1: The way I've gone about this before is: Take the time from the server, Take the time from the client (immediately) Get an offset. When

问题 I'm diving into iOS development and am building my own alarm clock app to become familiar with the platform and SDK. One of the API's I'm currently learning is the Local Notifications API, which I assume is the same API Apple uses to implement their alarms in their Clock app. What I don't understand is how they implement their "Snooze" functionality. As I understand it, Local Notifications allow you to present to the user an alert box that has at most two buttons when your app isn't running