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/************************************************************************
Routines for measuring time.
$Id: time.cxx 427 2004-09-27 04:45:31Z garland $
************************************************************************/
#include <gfx/gfx.h>
#if defined(WIN32)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
namespace gfx
{
// Only Windows NT supports getting proper time usage information.
// In Windows 95, we have to settle for measuring real time.
double get_cpu_time()
{
FILETIME start, end, kernel, user;
if( !GetThreadTimes(GetCurrentThread(), &start, &end, &kernel, &user) )
{
// We're running under Windows 95 instead of NT.
// Just get the current time and be done with it.
SYSTEMTIME now;
GetSystemTime(&now);
SystemTimeToFileTime(&now, &user);
}
// Convert into something we can do math on
LARGE_INTEGER i;
i.LowPart = user.dwLowDateTime;
i.HighPart = user.dwHighDateTime;
#ifdef __GNUC__
// The Win32 headers shipped with GCC don't define the QuadPart
// accessor for the LARGE_INTEGER type. So we have to build it
// directly.
long long quad = i.HighPart;
quad = (quad << 32) + i.LowPart;
return (double)quad / 1e7;
#else
// Convert to seconds and return
return (double)(i.QuadPart) / 1e7;
#endif
}
}
#elif defined(HAVE_GETRUSAGE)
#include <sys/time.h>
#include <sys/resource.h>
namespace gfx
{
double get_cpu_time()
{
struct rusage t;
getrusage(RUSAGE_SELF, &t);
return (double)t.ru_utime.tv_sec + (double)t.ru_utime.tv_usec/1000000;
}
}
#elif defined(HAVE_TIMES)
namespace gfx
{
double get_cpu_time()
{
struct tms t;
times(&t);
return (double)(t.tms_utime) / (double)CLK_TCK;
}
}
#else
#error "No supported timing mechanism available."
#endif
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