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[AI Task] [Tizen.Sensor] Cache Marshal.SizeOf in Sensor batch event hot path #7739

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[AI Task] [Tizen.Sensor] Cache Marshal.SizeOf in Sensor batch event hot path #7739

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055ff86
Refactor: Cache Marshal.SizeOf in Sensor batch event hot path (Fixes …
Jul 5, 2026
7e2b6c0
Address review feedback
Jul 6, 2026
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8 changes: 7 additions & 1 deletion src/Tizen.Sensor/Tizen.Sensor/Sensor.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@ public abstract class Sensor : IDisposable
private SensorPausePolicy _pausePolicy = SensorPausePolicy.None;
private IntPtr _sensorHandle = IntPtr.Zero;
private IntPtr _listenerHandle = IntPtr.Zero;
private static readonly int s_sensorEventStructSize = Marshal.SizeOf<Interop.SensorEventStruct>();
internal IList<Interop.SensorEventStruct> BatchedEvents { get; set; } = new List<Interop.SensorEventStruct>();


Expand Down Expand Up @@ -89,11 +90,16 @@ internal void updateBatchEvents(IntPtr eventsPtr, uint events_count)
if (events_count >= 1)
{
BatchedEvents.Clear();
if (BatchedEvents is List<Interop.SensorEventStruct> list && list.Capacity < events_count)
{
list.Capacity = (int)events_count;
}

IntPtr currentPtr = eventsPtr;
for (int i = 0; i < events_count; i++)
{
BatchedEvents.Add(Interop.IntPtrToEventStruct(currentPtr));
currentPtr += Marshal.SizeOf<Interop.SensorEventStruct>();
currentPtr += s_sensorEventStructSize;
}
Comment on lines 99 to 103

@gemini-code-assist gemini-code-assist Bot Jul 5, 2026

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medium

Since updateBatchEvents is on a hot path and BatchedEvents is cleared and repopulated on every call, we can optimize memory allocations by ensuring the underlying List<T> has sufficient capacity before the loop. This avoids multiple internal array reallocations and copying overhead during the loop.

Since BatchedEvents is initialized as a List<Interop.SensorEventStruct>, we can cast it and set its Capacity if it is currently smaller than events_count.

                if (BatchedEvents is List<Interop.SensorEventStruct> list && list.Capacity < events_count)
                {
                    list.Capacity = (int)events_count;
                }

                for (int i = 0; i < events_count; i++)
                {
                    BatchedEvents.Add(Interop.IntPtrToEventStruct(currentPtr));
                    currentPtr += s_sensorEventStructSize;
                }

}
}
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