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Time::now() supports cross-platform

This commit is contained in:
Nomango 2020-05-19 21:13:42 +08:00
parent 3fd3fbbbd8
commit 41671fa1f3
1 changed files with 19 additions and 5 deletions
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24
src/kiwano/core/Time.cpp
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@ -23,6 +23,7 @@
#include <kiwano/core/Time.h>
#include <regex>
#include <unordered_map>
#include <chrono>
namespace kiwano
{
@ -69,19 +70,32 @@ const Duration Time::operator-(const Time& other) const
Time Time::Now() noexcept
{
static LARGE_INTEGER freq = {};
if (freq.QuadPart == 0LL)
#if defined(KGE_PLATFORM_WINDOWS)
static double millisecs_per_count = {};
if (millisecs_per_count == 0)
{
LARGE_INTEGER freq = {};
// the Function will always succceed on systems that run Windows XP or later
QueryPerformanceFrequency(&freq);
millisecs_per_count = 1000.0 / static_cast<double>(freq.QuadPart);
}
LARGE_INTEGER count;
QueryPerformanceCounter(&count);
return Time{ static_cast<long>(count.QuadPart * millisecs_per_count) };
const long long whole = (count.QuadPart / freq.QuadPart) * 1000LL;
const long long part = (count.QuadPart % freq.QuadPart) * 1000LL / freq.QuadPart;
return Time{ static_cast<long>(whole + part) };
#else
using std::chrono::steady_clock;
using std::chrono::duration_cast;
using std::chrono::milliseconds;
const auto now = steady_clock::now();
const long long count = duration_cast<milliseconds>(now.time_since_epoch()).count();
return Time{ static_cast<long>(count) };
#endif
}
//-------------------------------------------------------