StagingBuff: Unify constraints into IOEngineConstraints

stimBuffApis/livoxGen1/stagingBuffer.cpp

@@ -1,16 +1,22 @@
 #include "stagingBuffer.h"
+#include <unistd.h>
 
 namespace smo {
 namespace stim_buff {
 
 // Static defaults for io_uring
-const StagingBuffer::InputEngineConstraints
-StagingBuffer::InputEngineConstraints::ioUringConstraints(
-	4096,  // slotStartAlignmentByteVal (page alignment for DMA)
+const StagingBuffer::IOEngineConstraints
+StagingBuffer::IOEngineConstraints::ioUringConstraints(
+	static_cast<size_t>(sysconf(_SC_PAGE_SIZE)),  // slotStartAlignmentByteVal (page alignment for DMA)
 	1472   // slotPadToNBytes (MTU 1500 - UDP/IP header 28)
 );
 
+// Static defaults for OpenCL input
+const StagingBuffer::IOEngineConstraints
+StagingBuffer::IOEngineConstraints::openClInputConstraints(
+	static_cast<size_t>(sysconf(_SC_PAGE_SIZE)),  // slotStartAlignmentByteVal (page alignment)
+	sizeof(void *)  // slotPadToNBytes (pointer size)
+);
+
 } // namespace stim_buff
 } // namespace smo
-
-

stimBuffApis/livoxGen1/stagingBuffer.h

@@ -31,29 +31,29 @@ namespace stim_buff {
 class StagingBuffer
 {
 public:
-	class InputEngineConstraints
+	class IOEngineConstraints
 	{
 	public:
-		InputEngineConstraints(
+		IOEngineConstraints(
 			size_t slotStartAlignmentByteVal_,
 			size_t slotPadToNBytes_)
 		: slotStartAlignmentByteVal(slotStartAlignmentByteVal_),
 		  slotPadToNBytes(slotPadToNBytes_)
 		{}
 
-		~InputEngineConstraints() = default;
+		~IOEngineConstraints() = default;
 
-		// Input-engine layout/constraints
 		size_t slotStartAlignmentByteVal;  // power-of-2 alignment (e.g., 4096)
 		size_t slotPadToNBytes;            // minimum size per datagram slot
 
-		// Static defaults for io_uring
-		static const InputEngineConstraints ioUringConstraints;
+		// Static defaults for io_uring and OpenCL
+		static const IOEngineConstraints ioUringConstraints;
+		static const IOEngineConstraints openClInputConstraints;
 
 		inline std::string stringify() const
 		{
 			std::ostringstream oss;
-			oss << "InputEngineConstraints{"
+			oss << "IOEngineConstraints{"
 				<< "slotStartAlignmentByteVal=" << slotStartAlignmentByteVal
 				<< ", slotPadToNBytes=" << slotPadToNBytes
 				<< "}";
@@ -61,13 +61,6 @@ public:
 		}
 	};
 
-	class OutputEngineConstraints
-	{
-	public:
-		OutputEngineConstraints() = default;
-		~OutputEngineConstraints() = default;
-	};
-
 public:
 	/**	EXPLANATION:
 	 * We use the input and output engine constraints to determine the total
@@ -75,8 +68,8 @@ public:
 	 * the given number of points per frame.
 	 */
 	explicit StagingBuffer(
-		const InputEngineConstraints& inputEngineConstraints,
-		const OutputEngineConstraints& outputEngineConstraints,
+		const IOEngineConstraints& inputEngineConstraints,
+		const IOEngineConstraints& outputEngineConstraints,
 		size_t nDgramsPerFrame);
 	~StagingBuffer() = default;
 
@@ -150,7 +143,7 @@ private:
 	// Layout/invariants
 	size_t nDgramsPerFrame;
 	size_t slotStrideNBytes;
-	InputEngineConstraints inputConstraints;
+	IOEngineConstraints inputConstraints;
 
 	// Descriptor (computed once; reused across frames)
 	mutable std::shared_ptr<FrameAssemblyDesc> frameDesc;
@@ -164,8 +157,8 @@ private:
  ******************************************************************************/
 
 inline StagingBuffer::StagingBuffer(
-	const InputEngineConstraints& inputEngineConstraints_,
-	const OutputEngineConstraints& /*outputEngineConstraints*/,
+	const IOEngineConstraints& inputEngineConstraints_,
+	const IOEngineConstraints& /*outputEngineConstraints*/,
 	size_t nDgramsPerFrame)
 : buffer(nullptr, MmapDeleter(0)), bufferNBytes(0),
 nDgramsPerFrame(nDgramsPerFrame), slotStrideNBytes(0),
@@ -231,19 +224,6 @@ inline void StagingBuffer::computeSlotStrideAndBufferSize()
 	               * inputConstraints.slotStartAlignmentByteVal;
 }
 
-/** Specific input/output engine constraints
- ******************************************************************************/
-
-class OpenClConstraints
-:	public StagingBuffer::OutputEngineConstraints
-{
-public:
-	OpenClConstraints()
-	:	StagingBuffer::OutputEngineConstraints()
-	{}
-	~OpenClConstraints() = default;
-};
-
 } // namespace stim_buff
 } // namespace smo