core_timing: Use higher precision sleeps on Windows

The precision of sleep_for and wait_for is limited to 1-1.5ms on Windows.
Using SleepForOneTick() allows us to sleep for exactly one interval of the current timer resolution.
This allows us to take advantage of systems that have a timer resolution of 0.5ms to reduce CPU overhead in the event loop.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/core/core_timing.h b/src/core/core_timing.h
index da366637b..4b89c0c39 100644
--- a/src/core/core_timing.h
+++ b/src/core/core_timing.h
@@ -122,6 +122,9 @@ public:
     /// Returns current time in emulated in Clock cycles
     u64 GetClockTicks() const;
 
+    /// Returns current time in nanoseconds.
+    std::chrono::nanoseconds GetCPUTimeNs() const;
+
     /// Returns current time in microseconds.
     std::chrono::microseconds GetGlobalTimeUs() const;
 
@@ -139,7 +142,8 @@ private:
 
     void Reset();
 
-    std::unique_ptr<Common::WallClock> clock;
+    std::unique_ptr<Common::WallClock> cpu_clock;
+    std::unique_ptr<Common::WallClock> event_clock;
 
     s64 global_timer = 0;