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#pragma once
#include <thrust/detail/config.h>
#include <cassert>
#if(THRUST_HOST_COMPILER == THRUST_HOST_COMPILER_MSVC || defined(_WIN32))
#include <windows.h>
class steady_timer
{
LARGE_INTEGER start_;
LARGE_INTEGER stop_;
LARGE_INTEGER frequency_; // Cached to avoid system calls.
public:
steady_timer() : start_(), stop_(), frequency_()
{
BOOL const r = QueryPerformanceFrequency(&frequency_);
assert(0 != r);
(void)r; // Silence unused variable 'r' in Release builds, when
// the assertion evaporates.
}
void start()
{
BOOL const r = QueryPerformanceCounter(&start_);
assert(0 != r);
(void)r; // Silence unused variable 'r' in Release builds, when
// the assertion evaporates.
}
void stop()
{
BOOL const r = QueryPerformanceCounter(&stop_);
assert(0 != r);
(void)r; // Silence unused variable 'r' in Release builds, when
// the assertion evaporates.
}
double seconds_elapsed()
{
return double(stop_.QuadPart - start_.QuadPart)
/ double(frequency_.QuadPart);
}
};
#else
#include <time.h>
class steady_timer
{
timespec start_;
timespec stop_;
public:
steady_timer() : start_(), stop_() {}
void start()
{
int const r = clock_gettime(CLOCK_MONOTONIC, &start_);
assert(0 == r);
(void)r; // Silence unused variable 'r' in Release builds, when
// the assertion evaporates.
}
void stop()
{
int const r = clock_gettime(CLOCK_MONOTONIC, &stop_);
assert(0 == r);
(void)r; // Silence unused variable 'r' in Release builds, when
// the assertion evaporates.
}
double seconds_elapsed()
{
return double(stop_.tv_sec - start_.tv_sec)
+ double(stop_.tv_nsec - start_.tv_nsec) * 1.0e-9;
}
};
#endif
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