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Add chrono.h implementation for Windows kernel #505

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Add chrono.h implementation for Windows kernel #505

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61 changes: 49 additions & 12 deletions include/EASTL/chrono.h
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@


// TODO: move to platform specific cpp or header file
#if defined EA_PLATFORM_MICROSOFT
#if defined(EA_PLATFORM_MICROSOFT) && !defined(EA_PLATFORM_WINDOWS_KERNEL)
EA_DISABLE_ALL_VC_WARNINGS()

#ifndef WIN32_LEAN_AND_MEAN
Expand All @@ -48,7 +48,9 @@
EA_RESTORE_ALL_VC_WARNINGS()
#endif

#if defined(EA_PLATFORM_MICROSOFT) && !defined(EA_PLATFORM_MINGW)
#if defined(EA_PLATFORM_WINDOWS_KERNEL)
#include <Wdm.h>
#elif defined(EA_PLATFORM_MICROSOFT) && !defined(EA_PLATFORM_MINGW)
// Nothing to do
#elif defined(EA_PLATFORM_APPLE)
#include <mach/mach_time.h>
Expand Down Expand Up @@ -544,20 +546,26 @@ namespace chrono
{
#if defined(EA_PLATFORM_MICROSOFT) && !defined(EA_PLATFORM_MINGW)
#define EASTL_NS_PER_TICK 1
#elif defined EA_PLATFORM_SONY
#elif defined(EA_PLATFORM_SONY)
#define EASTL_NS_PER_TICK 1
#elif defined EA_PLATFORM_POSIX
#elif defined(EA_PLATFORM_POSIX)
#define EASTL_NS_PER_TICK _XTIME_NSECS_PER_TICK
#else
#define EASTL_NS_PER_TICK 100
#endif

#if defined(EA_PLATFORM_WINDOWS_KERNEL)
#define EASTL_NS_PER_SYSTEM_TICK 100
#else
#define EASTL_NS_PER_SYSTEM_TICK EASTL_NS_PER_TICK
#endif

#if defined(EA_PLATFORM_POSIX)
typedef chrono::nanoseconds::period SystemClock_Period;
typedef chrono::nanoseconds::period SteadyClock_Period;
#else
typedef eastl::ratio_multiply<eastl::ratio<EASTL_NS_PER_TICK, 1>, nano>::type SystemClock_Period;
typedef eastl::ratio_multiply<eastl::ratio<EASTL_NS_PER_TICK, 1>, nano>::type SteadyClock_Period;
typedef eastl::ratio_multiply<eastl::ratio<EASTL_NS_PER_SYSTEM_TICK, 1>, nano>::type SystemClock_Period;
typedef eastl::ratio_multiply<eastl::ratio<EASTL_NS_PER_TICK, 1>, nano>::type SteadyClock_Period;
#endif


Expand All @@ -566,26 +574,34 @@ namespace chrono
///////////////////////////////////////////////////////////////////////////////
inline uint64_t GetTicks()
{
#if defined EA_PLATFORM_MICROSOFT
#if defined(EA_PLATFORM_MICROSOFT)
auto queryFrequency = []
{
LARGE_INTEGER frequency;
QueryPerformanceFrequency(&frequency);
#if defined(EA_PLATFORM_WINDOWS_KERNEL)
KeQueryPerformanceCounter(&frequency);
#else
QueryPerformanceFrequency(&frequency);
#endif
return double(1000000000.0L / (long double)frequency.QuadPart); // nanoseconds per tick
};

auto queryCounter = []
{
LARGE_INTEGER counter;
QueryPerformanceCounter(&counter);
#if defined(EA_PLATFORM_WINDOWS_KERNEL)
counter = KeQueryPerformanceCounter(nullptr);
#else
QueryPerformanceCounter(&counter);
#endif
return counter.QuadPart;
};

EA_DISABLE_VC_WARNING(4640) // warning C4640: construction of local static object is not thread-safe (VS2013)
static auto frequency = queryFrequency(); // cache cpu frequency on first call
EA_RESTORE_VC_WARNING()
return uint64_t(frequency * (double)queryCounter());
#elif defined EA_PLATFORM_SONY
#elif defined(EA_PLATFORM_SONY)
static_assert(false, "Implementing GetTicks() requires first party support");
return 0;
#elif defined(EA_PLATFORM_APPLE)
Expand Down Expand Up @@ -621,6 +637,21 @@ namespace chrono
#error "chrono not implemented for platform"
#endif
}

inline uint64_t GetSystemTicks()
{
#if defined(EA_PLATFORM_WINDOWS_KERNEL)
LARGE_INTEGER systemTime;
#if (NTDDI_VERSION >= 0x06020000) // NTDDI_WIN8
KeQuerySystemTimePrecise(&systemTime);
#else
KeQuerySystemTime(&systemTime);
#endif
return systemTime.QuadPart;
#else
return GetTicks();
#endif
}
} // namespace Internal


Expand All @@ -641,7 +672,7 @@ namespace chrono
// returns a time point representing the current point in time.
static time_point now() EA_NOEXCEPT
{
return time_point(duration(Internal::GetTicks()));
return time_point(duration(Internal::GetSystemTicks()));
}
};

Expand Down Expand Up @@ -671,7 +702,13 @@ namespace chrono
///////////////////////////////////////////////////////////////////////////////
// high_resolution_clock
///////////////////////////////////////////////////////////////////////////////
typedef system_clock high_resolution_clock;
#if defined(EA_PLATFORM_WINDOWS_KERNEL)
// Kernel ticks are less expensive to query precisely compared to system time
// on Windows kernel
typedef steady_clock high_resolution_clock;
#else
typedef system_clock high_resolution_clock;
#endif


} // namespace chrono
Expand Down