time measurement under linux?

[Jason House]

Trass3r wrote:

> I wrote a module to ease time measurement in my projects.
> Does anyone know how to get elapsed milli- or nanoseconds under linux?
> Want to make it portable :)

The difficulty of doing platform independent timing is one of the many reasons that drove me to Tango...


> 
> 
> 
> module time;
> 
> version(Windows)
> import std.c.windows.windows;
> 
> 
> long frequency;			/// frequency of the high performance counter
> long startTime;			/// current measurement start time
> long curTime;			/// current measurement end time
> const bool hpcAvailable;/// high performance counter supported?
> 
> /**
>   * initialize the high performance counter
>   */
> static this()
> {
> version(Win32)
> {
> QueryPerformanceFrequency (&frequency);
> hpcAvailable = false;
> if (frequency)
> {
> hpcAvailable = true; // high performance counter not supported
> pragma(msg, "high performance counter available");
> }
> }
> }
> 
> /**
>   * start measurement
>   */
> void start()
> {
> version(Windows)
> {
> if (hpcAvailable)
> QueryPerformanceCounter(&startTime);
> else
> {
> version(Win32)
> startTime = GetTickCount();
> version(Win64)
> startTime = GetTickCount64();
> }
> }
> }
> 
> /**
>   * get elapsed milliseconds
>   */
> double msecs()
> {
> version(Windows)
> {
> if (hpcAvailable)
> {
> QueryPerformanceCounter(&curTime);
> return ((curTime-startTime) * 1000) / cast(double) frequency;
> }
> else
> {
> version(Win32)
> curTime = GetTickCount();
> version(Win64)
> curTime = GetTickCount64();
> return (curTime-startTime);
> }
> }
> }
> 
> /**
>   * get elapsed nanoseconds
>   */
> double nsecs()
> {
> version(Windows)
> {
> if (hpcAvailable)
> {
> QueryPerformanceCounter(&curTime);
> return ((curTime-startTime) * 1000000) / cast(double) frequency;
> }
> else
> {
> version(Win32)
> curTime = GetTickCount();
> version(Win64)
> curTime = GetTickCount64();
> return (curTime-startTime) * 1000;
> }
> }
> }