OClCollMeshEngn,PcloudStimProd: port to sscl::co coros

We've now ported the OpenClCollMeshEngn and PcloudStimProd::produceFrameReq
portions of the Livox pipeline to coros.

include/adapters/opencl/clKernelCompletionAReq.h

@@ -0,0 +1,93 @@
+#ifndef ADAPTERS_OPENCL_CL_KERNEL_COMPLETION_AREQ_H
+#define ADAPTERS_OPENCL_CL_KERNEL_COMPLETION_AREQ_H
+
+#include <atomic>
+#include <coroutine>
+#include <functional>
+#include <memory>
+
+#define CL_TARGET_OPENCL_VERSION 120
+#include <CL/cl.h>
+
+#include <boost/asio/io_context.hpp>
+#include <boost/asio/post.hpp>
+
+namespace smo {
+namespace openclBoundary {
+
+/** Eager-start std::function callback -> coroutine adapter for OpenCL kernel
+ *  completion (cl_int event_command_exec_status posted to io_context).
+ */
+template <typename StartFn>
+class ClKernelCompletionAReq
+{
+public:
+	struct AsyncState
+	{
+		std::atomic<bool> settled{false};
+		cl_int result{};
+		std::coroutine_handle<> callerSchedHandle;
+	};
+
+	explicit ClKernelCompletionAReq(
+		boost::asio::io_context &resumeIoContext,
+		StartFn startFn)
+	: asyncState(std::make_shared<AsyncState>()),
+	resumeIoContext(resumeIoContext)
+	{
+		startFn([this](cl_int eventCommandExecStatus)
+		{
+			asyncState->result = eventCommandExecStatus;
+			signalSettledAndResumeCaller();
+		});
+	}
+
+	bool await_ready() const noexcept
+	{
+		return asyncState->settled.load(std::memory_order_acquire);
+	}
+
+	bool await_suspend(std::coroutine_handle<> callerSchedHandle) noexcept
+	{
+		if (asyncState->settled.load(std::memory_order_acquire)) {
+			return false;
+		}
+
+		asyncState->callerSchedHandle = callerSchedHandle;
+		return true;
+	}
+
+	cl_int await_resume() noexcept
+	{
+		return asyncState->result;
+	}
+
+private:
+	void signalSettledAndResumeCaller() noexcept
+	{
+		asyncState->settled.store(true, std::memory_order_release);
+
+		std::coroutine_handle<> handle = asyncState->callerSchedHandle;
+		if (!handle) {
+			return;
+		}
+
+		boost::asio::post(resumeIoContext, handle);
+	}
+
+	std::shared_ptr<AsyncState> asyncState;
+	boost::asio::io_context &resumeIoContext;
+};
+
+template <typename StartFn>
+ClKernelCompletionAReq<StartFn> getClKernelCompletionAReqAwaiter(
+	boost::asio::io_context &resumeIoContext,
+	StartFn startFn)
+{
+	return ClKernelCompletionAReq<StartFn>(resumeIoContext, std::move(startFn));
+}
+
+} // namespace openclBoundary
+} // namespace smo
+
+#endif // ADAPTERS_OPENCL_CL_KERNEL_COMPLETION_AREQ_H

include/adapters/smo/assembleFrameAReq.h

@@ -0,0 +1,44 @@
+#ifndef ADAPTERS_SMO_ASSEMBLE_FRAME_AREQ_H
+#define ADAPTERS_SMO_ASSEMBLE_FRAME_AREQ_H
+
+#include <adapters/smo/cpsCallbackAReq.h>
+#include <spinscale/asynchronousLoop.h>
+#include <spinscale/cps/callback.h>
+#include <ioUringAssemblyEngine.h>
+
+namespace smo {
+namespace cpsBoundary {
+
+struct AssembleFrameResult
+{
+	bool success = false;
+	sscl::AsynchronousLoop loop{0};
+};
+
+inline CpsCallbackAReq<
+	AssembleFrameResult,
+	stim_buff::IoUringAssemblyEngine::assembleFrameReqCbFn,
+	std::function<void(sscl::cps::Callback<
+		stim_buff::IoUringAssemblyEngine::assembleFrameReqCbFn>)>>
+getAssembleFrameReqAReqAwaiter(
+	boost::asio::io_context &resumeIoContext,
+	stim_buff::IoUringAssemblyEngine &engine)
+{
+	return CpsCallbackAReq<
+		AssembleFrameResult,
+		stim_buff::IoUringAssemblyEngine::assembleFrameReqCbFn,
+		std::function<void(sscl::cps::Callback<
+			stim_buff::IoUringAssemblyEngine::assembleFrameReqCbFn>)>>(
+		resumeIoContext,
+		[&engine](
+			sscl::cps::Callback<
+				stim_buff::IoUringAssemblyEngine::assembleFrameReqCbFn> cb)
+		{
+			engine.assembleFrameReq(std::move(cb));
+		});
+}
+
+} // namespace cpsBoundary
+} // namespace smo
+
+#endif // ADAPTERS_SMO_ASSEMBLE_FRAME_AREQ_H

stimBuffApis/livoxGen1/CMakeLists.txt

@@ -38,6 +38,7 @@ if(ENABLE_STIMBUFFAPI_livoxGen1)
 		${Boost_INCLUDE_DIRS}
 		${CMAKE_SOURCE_DIR}/include
 		${CMAKE_SOURCE_DIR}/smocore/include
+		${CMAKE_CURRENT_SOURCE_DIR}
 		${CMAKE_SOURCE_DIR}/commonLibs
 		${URING_INCLUDE_DIRS}
 		${OPENCL_INCLUDE_DIRS}

stimBuffApis/livoxGen1/openClCollatingAndMeshingEngine.cpp

@@ -8,10 +8,10 @@
 #include <algorithm>
 #include <boost/system/error_code.hpp>
 #include <boost/asio/deadline_timer.hpp>
-#include <spinscale/cps/asynchronousContinuation.h>
-#include <spinscale/cps/asynchronousBridge.h>
-#include <spinscale/cps/callback.h>
 #include <spinscale/asynchronousLoop.h>
+#include <spinscale/co/invokers.h>
+#include <spinscale/cps/asynchronousBridge.h>
+#include <adapters/opencl/clKernelCompletionAReq.h>
 #include <componentThread.h>
 #include <user/stimulusFrame.h>
 #include <livoxProto1/device.h>
@@ -998,83 +998,65 @@ void OpenClCollatingAndMeshingEngine::produceAmbienceStimulusFrame(
 	passbandCountOut = passbandCount;
 }
 
-class OpenClCollatingAndMeshingEngine::CompactCollateAndMeshFrameReq
+sscl::co::ViralNonPostingInvoker<bool>
-:	public sscl::cps::PostedAsynchronousContinuation<compactCollateAndMeshFrameReqCbFn>
+OpenClCollatingAndMeshingEngine::compactCollateAndMeshFrameCReq(
+	sscl::AsynchronousLoop& frameAssemblyResult,
+	StimulusFrame& /*stimulusFrame*/,
+	std::optional<std::reference_wrapper<StimulusFrame>> intensityStimFrame,
+	std::optional<AmbienceProductionDesc> lightAmbienceProductionDesc,
+	std::optional<AmbienceProductionDesc> darkAmbienceProductionDesc)
 {
-private:
-	OpenClCollatingAndMeshingEngine& engine;
-	sscl::AsynchronousLoop frameAssemblyResult;
-	StimulusFrame& stimulusFrame;
-	std::optional<std::reference_wrapper<StimulusFrame>> intensityStimFrame;
-	std::optional<AmbienceProductionDesc> lightAmbienceProductionDesc;
-	std::optional<AmbienceProductionDesc> darkAmbienceProductionDesc;
-
-public:
-	CompactCollateAndMeshFrameReq(
-		OpenClCollatingAndMeshingEngine& engine_,
-		sscl::AsynchronousLoop& asyncLoop,
-		StimulusFrame& stimulusFrame_,
-		std::optional<std::reference_wrapper<StimulusFrame>> intensityStimFrame_,
-		std::optional<AmbienceProductionDesc> lightAmbienceProductionDesc_,
-		std::optional<AmbienceProductionDesc> darkAmbienceProductionDesc_,
-		const std::shared_ptr<sscl::ComponentThread>& caller,
-		sscl::cps::Callback<compactCollateAndMeshFrameReqCbFn> cb)
-	:	sscl::cps::PostedAsynchronousContinuation<compactCollateAndMeshFrameReqCbFn>(
-			caller, cb),
-	engine(engine_),
-	frameAssemblyResult(asyncLoop), stimulusFrame(stimulusFrame_),
-	intensityStimFrame(intensityStimFrame_),
-	lightAmbienceProductionDesc(std::move(lightAmbienceProductionDesc_)),
-	darkAmbienceProductionDesc(std::move(darkAmbienceProductionDesc_))
-	{}
-
-	bool anyAmbienceAttached() const
 	{
-		return lightAmbienceProductionDesc.has_value()
+		sscl::SpinLock::Guard guard(openClCollMeshEngnCanceler.s.lock);
+		if (openClCollMeshEngnCanceler.isCancellationRequestedUnlocked())
+			{ co_return false; }
+	}
+
+	auto& resumeIoContext = parent.device->componentThread->getIoContext();
+
+	bool needsCompaction = IoUringAssemblyEngine::compactionIsNeeded(
+		frameAssemblyResult.nSucceeded.load(), frameAssemblyResult.nTotal);
+
+	bool anyAmbienceAttached = lightAmbienceProductionDesc.has_value()
 		|| darkAmbienceProductionDesc.has_value();
-	}
 
-public:
+	if (needsCompaction)
-	void callOriginalCallback(bool success)
-		{ callOriginalCb(success, std::ref(stimulusFrame)); }
-
-public:
-	void compactCollateAndMeshFrameReq1_doCompact_posted(
-		std::shared_ptr<CompactCollateAndMeshFrameReq> context)
 	{
-		sscl::SpinLock::Guard guard(engine.openClCollMeshEngnCanceler.s.lock);
+		// compactCollateAndMeshFrameReq1_doCompact_posted
-		if (engine.openClCollMeshEngnCanceler.isCancellationRequestedUnlocked())
 		{
-			callOriginalCallback(false);
+			sscl::SpinLock::Guard guard(openClCollMeshEngnCanceler.s.lock);
-			return;
+			if (openClCollMeshEngnCanceler.isCancellationRequestedUnlocked())
-		}
+				{ co_return false; }
 
 			// Record compact kernel start time
-		engine.compactKernelStartTime = std::chrono::high_resolution_clock::now();
+			compactKernelStartTime = std::chrono::high_resolution_clock::now();
-
+		}
-		bool success = engine.startCompactKernel(
-			engine.parent.assemblyBuffer,
-			static_cast<uint32_t>(context->frameAssemblyResult.nSucceeded.load()),
-			std::bind(
-				&CompactCollateAndMeshFrameReq
-					::compactCollateAndMeshFrameReq2_compactDone_posted,
-				context.get(), context,
-				std::placeholders::_1));
 
+		cl_int compactStatus = co_await openclBoundary::getClKernelCompletionAReqAwaiter(
+			resumeIoContext,
+			[this, &frameAssemblyResult](std::function<void(cl_int)> completionCb)
+		{
+			bool success = startCompactKernel(
+				parent.assemblyBuffer,
+				static_cast<uint32_t>(
+					frameAssemblyResult.nSucceeded.load()),
+				std::move(completionCb));
 			if (!success)
 			{
-			engine.compactKernelComplete();
+				compactKernelComplete();
-			callOriginalCallback(false);
+				completionCb(CL_INVALID_OPERATION);
-			return;
 			}
+		});
+
+		if (compactStatus == CL_INVALID_OPERATION)
+		{
+			co_return false;
 		}
 
-	void compactCollateAndMeshFrameReq2_compactDone_posted(
+		// compactCollateAndMeshFrameReq2_compactDone_posted
-		std::shared_ptr<CompactCollateAndMeshFrameReq> context,
-		cl_int compactStatus)
 		{
-		sscl::SpinLock::Guard guard(engine.openClCollMeshEngnCanceler.s.lock);
+			sscl::SpinLock::Guard guard(openClCollMeshEngnCanceler.s.lock);
-		if (engine.openClCollMeshEngnCanceler.isCancellationRequestedUnlocked())
+			if (openClCollMeshEngnCanceler.isCancellationRequestedUnlocked())
 			{
 				/**	EXPLANATION:
 				 * We intentionally don't call compactKernelComplete() here because
@@ -1082,78 +1064,69 @@ public:
 				 * finalize() will also be forced to call compactKernelComplete()
 				 * inside of finalize().
 				 */
-			callOriginalCallback(false);
+				co_return false;
-			return;
 			}
 
-		engine.compactKernelComplete();
+			compactKernelComplete();
 			// Record compact kernel end time
-		engine.compactKernelEndTime = std::chrono::high_resolution_clock::now();
+			compactKernelEndTime = std::chrono::high_resolution_clock::now();
 
 			// If compact failed, call callback directly with failure
-		if (compactStatus != CL_SUCCESS)
+			if (compactStatus != CL_SUCCESS) {
-		{
+				co_return false;
-			callOriginalCallback(false);
-			return;
 			}
 
 #if 0
 			// Print first 4 bytes of each slot
-		if (engine.frameAssemblyDesc)
+			if (frameAssemblyDesc)
 			{
-			for (size_t i = 0; i < engine.frameAssemblyDesc->numSlots; ++i) {
+				for (size_t i = 0; i < frameAssemblyDesc->numSlots; ++i) {
-				engine.parent.ioUringAssemblyEngine.printSlotBytes(i, 4);
+					parent.ioUringAssemblyEngine.printSlotBytes(i, 4);
 				}
 			}
 #endif
-
+		}
-		guard.unlockPrematurely();
-		context->compactCollateAndMeshFrameReq3_doCollate_posted(context);
 	}
 
-	void compactCollateAndMeshFrameReq3_doCollate_posted(
+	// compactCollateAndMeshFrameReq3_doCollate_posted
-		std::shared_ptr<CompactCollateAndMeshFrameReq> context)
 	{
-		sscl::SpinLock::Guard guard(engine.openClCollMeshEngnCanceler.s.lock);
+		sscl::SpinLock::Guard guard(openClCollMeshEngnCanceler.s.lock);
-		if (engine.openClCollMeshEngnCanceler.isCancellationRequestedUnlocked())
+		if (openClCollMeshEngnCanceler.isCancellationRequestedUnlocked()) {
-		{
+			co_return false;
-			callOriginalCallback(false);
-			return;
 		}
 
 		// Record collate kernel start time
-		engine.collateKernelStartTime = std::chrono::high_resolution_clock::now();
+		collateKernelStartTime = std::chrono::high_resolution_clock::now();
-
+	}
-		bool success = engine.startCollateKernel(
-			context->intensityStimFrame, context->anyAmbienceAttached(),
-			std::bind(
-				&CompactCollateAndMeshFrameReq
-					::compactCollateAndMeshFrameReq4_collateDone_maybePosted,
-				context.get(), context,
-				std::placeholders::_1));
 
+	cl_int collateStatus = co_await openclBoundary::getClKernelCompletionAReqAwaiter(
+		resumeIoContext,
+		[this, intensityStimFrame, anyAmbienceAttached](
+			std::function<void(cl_int)> completionCb)
+	{
+		bool success = startCollateKernel(
+			intensityStimFrame, anyAmbienceAttached,
+			std::move(completionCb));
 		if (!success)
 		{
-			engine.collateKernelComplete(
+			collateKernelComplete(
-				context->intensityStimFrame, context->anyAmbienceAttached());
+				intensityStimFrame, anyAmbienceAttached);
-
+			completionCb(CL_INVALID_OPERATION);
-			callOriginalCallback(false);
-			return;
 		}
+	});
+
+	if (collateStatus == CL_INVALID_OPERATION) {
+		co_return false;
 	}
 
-	void compactCollateAndMeshFrameReq4_collateDone_maybePosted(
+	// compactCollateAndMeshFrameReq4_collateDone_maybePosted
-		[[maybe_unused]] std::shared_ptr<CompactCollateAndMeshFrameReq> context,
-		cl_int collateStatus)
-	{
-		sscl::SpinLock::Guard guard(engine.openClCollMeshEngnCanceler.s.lock);
-		if (engine.openClCollMeshEngnCanceler.isCancellationRequestedUnlocked())
 	{
+		sscl::SpinLock::Guard guard(openClCollMeshEngnCanceler.s.lock);
+		if (openClCollMeshEngnCanceler.isCancellationRequestedUnlocked()) {
 			/* We intentionally don't call collateKernelComplete() here for the
 			 * same reason as above.
 			 */
-			callOriginalCallback(false);
+			co_return false;
-			return;
 		}
 
 		/**	EXPLANATION:
@@ -1165,55 +1138,51 @@ public:
 		 * Therefore it's finalize()'s responsibility to ensure that it properly
 		 * completes/cleans up any in-flight operations.
 		 */
-		engine.collateKernelComplete(
+		collateKernelComplete(
-			context->intensityStimFrame, context->anyAmbienceAttached());
+			intensityStimFrame, anyAmbienceAttached);
 
 		// Produce each attached ambience stimbuff's passband count from
 		// the per-slot averages the collate kernel staged.
 		uint32_t nSucceededForAmbience =
-			context->frameAssemblyResult.nSucceeded.load();
+			frameAssemblyResult.nSucceeded.load();
 
-		if (context->lightAmbienceProductionDesc.has_value())
+		if (lightAmbienceProductionDesc.has_value())
 		{
-			engine.produceAmbienceStimulusFrame(
+			produceAmbienceStimulusFrame(
-				context->lightAmbienceProductionDesc->frame.get(),
+				lightAmbienceProductionDesc->frame.get(),
-				context->lightAmbienceProductionDesc->comparator,
+				lightAmbienceProductionDesc->comparator,
 				nSucceededForAmbience);
 		}
 
-		if (context->darkAmbienceProductionDesc.has_value())
+		if (darkAmbienceProductionDesc.has_value())
 		{
-			engine.produceAmbienceStimulusFrame(
+			produceAmbienceStimulusFrame(
-				context->darkAmbienceProductionDesc->frame.get(),
+				darkAmbienceProductionDesc->frame.get(),
-				context->darkAmbienceProductionDesc->comparator,
+				darkAmbienceProductionDesc->comparator,
 				nSucceededForAmbience);
 		}
 
 		// Record collate kernel end time
-		engine.collateKernelEndTime = std::chrono::high_resolution_clock::now();
+		collateKernelEndTime = std::chrono::high_resolution_clock::now();
-
-		bool success = (collateStatus == CL_SUCCESS);
 
 		// Early callback + return pattern
-		if (!success)
+		bool success = (collateStatus == CL_SUCCESS);
-		{
+		if (!success) { co_return false; }
-			callOriginalCallback(false);
-			return;
-		}
 
-		uint32_t nSucceeded = context->frameAssemblyResult.nSucceeded.load();
+		uint32_t nSucceeded = frameAssemblyResult.nSucceeded.load();
 
-		int returnMode = static_cast<int>(engine.parent.device->currentReturnMode);
+		int returnMode = static_cast<int>(parent.device->currentReturnMode);
 		size_t pointsPerDgram = livoxProto1::Device::getNPointsPerDgram(
 			returnMode);
 		size_t totalPoints = nSucceeded * pointsPerDgram;
 
 		// Count points with intensity greater than 116
 		size_t highIntensityCount = 0;
-		if (context->intensityStimFrame.has_value())
+		if (intensityStimFrame.has_value())
 		{
-			StimulusFrame& intensityFrame = context->intensityStimFrame->get();
+			StimulusFrame& intensityFrame = intensityStimFrame->get();
-			float* intensityFloats = reinterpret_cast<float*>(intensityFrame.slotDesc.vaddr);
+			float* intensityFloats = reinterpret_cast<float*>(
+				intensityFrame.slotDesc.vaddr);
 			for (size_t i = 0; i < totalPoints; ++i)
 			{
 				float intensity = intensityFloats[i];
@@ -1227,62 +1196,15 @@ public:
 
 #if 0
 		std::cout << __func__ << ": intensityRingBufferIndex="
-			<< (context->intensityStimFrame.has_value() ?
+			<< (intensityStimFrame.has_value() ?
-				context->intensityStimFrame->get().ringBufferIndex : SIZE_MAX)
+				intensityStimFrame->get().ringBufferIndex : SIZE_MAX)
 			<< ", pointsPerDgram=" << pointsPerDgram
 			<< ", nSucceeded=" << nSucceeded
 			<< ", totalPoints=" << totalPoints
 			<< ", highIntensityCount=" << highIntensityCount << std::endl;
 #endif
 
-		callOriginalCallback(success);
+		co_return success;
-	}
-};
-
-void OpenClCollatingAndMeshingEngine::compactCollateAndMeshFrameReq(
-	sscl::AsynchronousLoop& asyncLoop, StimulusFrame& stimulusFrame,
-	std::optional<std::reference_wrapper<StimulusFrame>> intensityStimFrame,
-	std::optional<AmbienceProductionDesc> lightAmbienceProductionDesc,
-	std::optional<AmbienceProductionDesc> darkAmbienceProductionDesc,
-	sscl::cps::Callback<compactCollateAndMeshFrameReqCbFn> callback)
-{
-	{
-		sscl::SpinLock::Guard guard(openClCollMeshEngnCanceler.s.lock);
-		if (openClCollMeshEngnCanceler.isCancellationRequestedUnlocked())
-		{
-			callback.callbackFn(false, stimulusFrame);
-			return;
-		}
-	}
-
-	auto caller = smoHooksPtr->ComponentThread_getSelf();
-	auto request = std::make_shared<CompactCollateAndMeshFrameReq>(
-		*this, asyncLoop, stimulusFrame, intensityStimFrame,
-		std::move(lightAmbienceProductionDesc), std::move(darkAmbienceProductionDesc),
-		caller,
-		std::move(callback));
-
-	// Check if compaction is needed
-	bool needsCompaction = IoUringAssemblyEngine::compactionIsNeeded(
-		asyncLoop.nSucceeded.load(), asyncLoop.nTotal);
-
-	// Start with compaction if needed, then chain to collation
-	if (needsCompaction)
-	{
-		boost::asio::post(parent.device->componentThread->getIoContext(),
-			STC(std::bind(
-				&CompactCollateAndMeshFrameReq
-					::compactCollateAndMeshFrameReq1_doCompact_posted,
-				request.get(), request)));
-	}
-	else
-	{
-		// Skip compaction, go straight to collation
-		boost::asio::post(parent.device->componentThread->getIoContext(),
-			STC(std::bind(
-				&CompactCollateAndMeshFrameReq
-					::compactCollateAndMeshFrameReq3_doCollate_posted,
-				request.get(), request)));
 	}
 }
 

stimBuffApis/livoxGen1/openClCollatingAndMeshingEngine.h

@@ -13,7 +13,7 @@
 #define CL_TARGET_OPENCL_VERSION 120
 #include <CL/cl.h>
 #include <spinscale/asynchronousLoop.h>
-#include <spinscale/cps/callback.h>
+#include <spinscale/co/invokers.h>
 #include <spinscale/syncCancelerForAsyncWork.h>
 #include <user/stimulusFrame.h>
 #include <user/stagingBuffer.h>
@@ -86,14 +86,12 @@ public:
 	bool setup();
 	void finalize();
 
-	typedef std::function<void(bool, StimulusFrame&)>
+	sscl::co::ViralNonPostingInvoker<bool> compactCollateAndMeshFrameCReq(
-		compactCollateAndMeshFrameReqCbFn;
+		sscl::AsynchronousLoop& frameAssemblyResult,
-	void compactCollateAndMeshFrameReq(
+		StimulusFrame& stimulusFrame,
-		sscl::AsynchronousLoop& asyncLoop, StimulusFrame& stimulusFrame,
 		std::optional<std::reference_wrapper<StimulusFrame>> intensityStimFrame,
 		std::optional<AmbienceProductionDesc> lightAmbienceProductionDesc,
-		std::optional<AmbienceProductionDesc> darkAmbienceProductionDesc,
+		std::optional<AmbienceProductionDesc> darkAmbienceProductionDesc);
-		sscl::cps::Callback<compactCollateAndMeshFrameReqCbFn> callback);
 
 private:
 	// Callback function types
@@ -214,9 +212,6 @@ private:
 	bool mapAverageIntensityBuffer(cl_map_flags mapFlags = CL_MAP_READ);
 	bool unmapAverageIntensityBuffer();
 
-	// Forward declaration for continuation class
-	class CompactCollateAndMeshFrameReq;
-
 	// Unified kernel start function
 	template<typename SetupArgsFn, typename ValidateBuffersFn>
 	bool startKernel(

stimBuffApis/livoxGen1/pcloudStimulusProducer.cpp

@@ -11,6 +11,8 @@
 #include <user/spMcRingBuffer.h>
 #include <componentThread.h>
 #include <spinscale/asynchronousLoop.h>
+#include <spinscale/co/invokers.h>
+#include <adapters/smo/assembleFrameAReq.h>
 #include <user/stimulusFrame.h>
 #include <user/frameAssemblyDesc.h>
 #include <livoxProto1/device.h>
@@ -428,219 +430,205 @@ PcloudStimulusProducer::getOrCreateAttachedStimulusBuffer(
 
 void PcloudStimulusProducer::stimFrameProductionTimesliceInd()
 {
-	produceFrameReq({nullptr, nullptr});
+	holdProduceFrameCReq();
 }
 
-class PcloudStimulusProducer::ProduceFrameReq
+struct AllowNextStimulusFrameGuard
-:	public sscl::cps::PostedAsynchronousContinuation<produceFrameReqCbFn>
 {
-private:
+	PcloudStimulusProducer& producer;
-	PcloudStimulusProducer& pcloudProducer;
+
-	sscl::AsynchronousLoop frameAssemblyResult;
+	explicit AllowNextStimulusFrameGuard(PcloudStimulusProducer& _producer)
-	StimulusFrame& stimulusFrame;
+	: producer(_producer)
+	{}
+
+	~AllowNextStimulusFrameGuard()
+		{ producer.allowNextStimulusFrame(); }
+};
+
+void PcloudStimulusProducer::holdProduceFrameCReq()
+{
+	/**	EXPLANATION:
+	 * We shouldn't acquire stimulusProducerCanceler.s.lock here because
+	 * this function is called from
+	 * StimulusProducer::stimFrameProductionTimesliceInd(), which is already
+	 * holding the lock.
+	 */
+	activeProduceFrameInvoker.emplace(produceFrameCReq(
+		produceFrameExceptionPtr,
+		[this]() { activeProduceFrameInvoker.reset(); }));
+}
+
+sscl::co::NonViralNonPostingInvoker PcloudStimulusProducer::produceFrameCReq(
+	[[maybe_unused]] std::exception_ptr& exceptionPtr,
+	[[maybe_unused]] std::function<void()> completion)
+{
+	AllowNextStimulusFrameGuard allowNextGuard(*this);
+	StimulusFrame& stimulusFrame = tempStimulusFrame;
+	sscl::AsynchronousLoop frameAssemblyResult(0);
 	std::optional<std::reference_wrapper<StimulusFrame>> intensityStimFrame;
 	std::optional<std::reference_wrapper<StimulusFrame>> lightAmbienceStimFrame;
 	std::optional<std::reference_wrapper<StimulusFrame>> darkAmbienceStimFrame;
 
-public:
+	auto& resumeIoContext = device->componentThread->getIoContext();
-	ProduceFrameReq(
-		PcloudStimulusProducer& producer,
-		const std::shared_ptr<sscl::ComponentThread>& caller,
-		sscl::cps::Callback<produceFrameReqCbFn> cb)
-	:	sscl::cps::PostedAsynchronousContinuation<produceFrameReqCbFn>(caller, cb),
-	pcloudProducer(producer),
-	frameAssemblyResult(0),
-	stimulusFrame(producer.tempStimulusFrame)
-	{}
 
-public:
+	// produceFrameReq1_doAssemble_posted
-	void callOriginalCallback()
+	/**	EXPLANATION:
-	{
+	 * stimFrameProductionTimesliceInd() is entered with
-		pcloudProducer.allowNextStimulusFrame();
+	 * stimulusProducerCanceler.s.lock held; do not re-acquire here.
-		callOriginalCb();
+	 *
-	}
+     * This function is called from
+     * StimulusProducer::stimFrameProductionTimesliceInd(), whose caller is
+	 * already holding the lock.
+     */
+	if (stimulusProducerCanceler.isCancellationRequestedUnlocked())
+		{ co_return; }
 
-public:
+	cpsBoundary::AssembleFrameResult assembleResult = co_await
-	void produceFrameReq1_doAssemble_posted(
+		cpsBoundary::getAssembleFrameReqAReqAwaiter(
-		std::shared_ptr<ProduceFrameReq> context)
+			resumeIoContext, ioUringAssemblyEngine);
-	{
-		sscl::SpinLock::Guard guard(
-			pcloudProducer.stimulusProducerCanceler.s.lock);
-		if (pcloudProducer.stimulusProducerCanceler
-			.isCancellationRequestedUnlocked())
-		{
-			callOriginalCallback();
-			return;
-		}
 
-		pcloudProducer.ioUringAssemblyEngine.assembleFrameReq(
+	// produceFrameReq2_assembleDone
-			{context, std::bind(
+	std::optional<AmbienceProductionDesc> lightAmbienceProductionDescDesc;
-				&ProduceFrameReq::produceFrameReq2_assembleDone,
+	std::optional<AmbienceProductionDesc> darkAmbienceProductionDescDesc;
-				context.get(), context,
-				std::placeholders::_1, std::placeholders::_2)});
-	}
-
-	void produceFrameReq2_assembleDone(
-		std::shared_ptr<ProduceFrameReq> context,
-		bool success, sscl::AsynchronousLoop loop)
 	{
-		sscl::SpinLock::Guard guard(
+		sscl::SpinLock::Guard guard(stimulusProducerCanceler.s.lock);
-			pcloudProducer.stimulusProducerCanceler.s.lock);
+		if (stimulusProducerCanceler.isCancellationRequestedUnlocked())
-		if (pcloudProducer.stimulusProducerCanceler
+			{ co_return; }
-			.isCancellationRequestedUnlocked())
-		{
-			callOriginalCallback();
-			return;
-		}
 
-		if (!success)
+		if (!assembleResult.success)
 		{
-			callOriginalCallback();
+			if (attachedStimulusBuffers.size() > 0) {
-
-			if (pcloudProducer.attachedStimulusBuffers.size() > 0) {
 				std::cerr << __func__ << ": Failed to assemble frame.\n";
 			}
-			return;
+			co_return;
 		}
 
-		context->frameAssemblyResult = loop;
+		frameAssemblyResult = assembleResult.loop;
 
 		// Check if intensity buffer is attached and acquire frame if so
-		if (auto intensityBuff = pcloudProducer.intensityStimulusBuffer.load(
+		if (auto intensityBuff = intensityStimulusBuffer.load(
 			std::memory_order_acquire))
 		{
 			size_t intensityRingbuffIndex = intensityBuff
 				->ringBuffer.getIndexToProduceInto();
 
-			StimulusFrame& intensityStimFrame = intensityBuff
+			StimulusFrame& intensityStimFrameRef = intensityBuff
 				->ringBuffer.getDataAtSlot(
 					intensityRingbuffIndex);
 
-			intensityStimFrame.lock.writeAcquire();
+			intensityStimFrameRef.lock.writeAcquire();
-			context->intensityStimFrame = std::make_optional(
+			intensityStimFrame = std::make_optional(
-				std::ref(intensityStimFrame));
+				std::ref(intensityStimFrameRef));
 		}
 		else {
-			context->intensityStimFrame = std::nullopt;
+			intensityStimFrame = std::nullopt;
 		}
 
 		// Check if light ambience buffer is attached and acquire frame if so
-		std::optional<AmbienceProductionDesc> lightAmbienceProductionDescDesc;
 		if (auto lightAmbienceBuff =
-			pcloudProducer.lightAmbienceStimulusBuffer.load(
+			lightAmbienceStimulusBuffer.load(
 				std::memory_order_acquire))
 		{
 			size_t lightAmbienceRingbuffIndex = lightAmbienceBuff
 				->ringBuffer.getIndexToProduceInto();
 
-			StimulusFrame& lightAmbienceStimFrame = lightAmbienceBuff
+			StimulusFrame& lightAmbienceStimFrameRef = lightAmbienceBuff
 				->ringBuffer.getDataAtSlot(lightAmbienceRingbuffIndex);
 
-			lightAmbienceStimFrame.lock.writeAcquire();
+			lightAmbienceStimFrameRef.lock.writeAcquire();
-			context->lightAmbienceStimFrame = std::make_optional(
+			lightAmbienceStimFrame = std::make_optional(
-				std::ref(lightAmbienceStimFrame));
+				std::ref(lightAmbienceStimFrameRef));
 			lightAmbienceProductionDescDesc = AmbienceProductionDesc{
-				std::ref(lightAmbienceStimFrame),
+				std::ref(lightAmbienceStimFrameRef),
 				lightAmbienceBuff->passbandCountGtComparator};
 		}
 		else {
-			context->lightAmbienceStimFrame = std::nullopt;
+			lightAmbienceStimFrame = std::nullopt;
 		}
 
 		// Check if dark ambience buffer is attached and acquire frame if so
-		std::optional<AmbienceProductionDesc> darkAmbienceProductionDescDesc;
 		if (auto darkAmbienceBuff =
-			pcloudProducer.darkAmbienceStimulusBuffer.load(
+			darkAmbienceStimulusBuffer.load(
 				std::memory_order_acquire))
 		{
 			size_t darkAmbienceRingbuffIndex = darkAmbienceBuff
 				->ringBuffer.getIndexToProduceInto();
 
-			StimulusFrame& darkAmbienceStimFrame = darkAmbienceBuff
+			StimulusFrame& darkAmbienceStimFrameRef = darkAmbienceBuff
 				->ringBuffer.getDataAtSlot(darkAmbienceRingbuffIndex);
 
-			darkAmbienceStimFrame.lock.writeAcquire();
+			darkAmbienceStimFrameRef.lock.writeAcquire();
-			context->darkAmbienceStimFrame = std::make_optional(
+			darkAmbienceStimFrame = std::make_optional(
-				std::ref(darkAmbienceStimFrame));
+				std::ref(darkAmbienceStimFrameRef));
 			darkAmbienceProductionDescDesc = AmbienceProductionDesc{
-				std::ref(darkAmbienceStimFrame),
+				std::ref(darkAmbienceStimFrameRef),
 				darkAmbienceBuff->passbandCountLtComparator};
 		}
 		else {
-			context->darkAmbienceStimFrame = std::nullopt;
+			darkAmbienceStimFrame = std::nullopt;
+		}
 	}
 
-		pcloudProducer.openClCollatingAndMeshingEngine.compactCollateAndMeshFrameReq(
+	bool compactCollateSuccess = co_await
-			loop, stimulusFrame,
+		openClCollatingAndMeshingEngine.compactCollateAndMeshFrameCReq(
-			context->intensityStimFrame,
+			frameAssemblyResult, stimulusFrame,
+			intensityStimFrame,
 			std::move(lightAmbienceProductionDescDesc),
-			std::move(darkAmbienceProductionDescDesc),
+			std::move(darkAmbienceProductionDescDesc));
-			{context, std::bind(
-				&ProduceFrameReq::produceFrameReq3_compactCollateDone,
-				context.get(), context,
-				std::placeholders::_1, std::placeholders::_2)});
-	}
 
-	void produceFrameReq3_compactCollateDone(
+	// produceFrameReq3_compactCollateDone
-		[[maybe_unused]] std::shared_ptr<ProduceFrameReq> context,
-		bool success, StimulusFrame& /*stimulusFrame*/)
-	{
 #if SMO_DEBUG_PCLOUD_AMBIENCE_INTRIN
 		uint32_t logLightPassbandCount = 0;
 		uint32_t logDarkPassbandCount = 0;
 		bool logLightAmbience = false;
 		bool logDarkAmbience = false;
-		if (success)
+		if (compactCollateSuccess)
 		{
-			if (context->lightAmbienceStimFrame.has_value())
+			if (lightAmbienceStimFrame.has_value())
 			{
 				logLightPassbandCount = *reinterpret_cast<const uint32_t*>(
-					context->lightAmbienceStimFrame->get().slotDesc.vaddr);
+					lightAmbienceStimFrame->get().slotDesc.vaddr);
 				logLightAmbience = true;
 			}
-			if (context->darkAmbienceStimFrame.has_value())
+			if (darkAmbienceStimFrame.has_value())
 			{
 				logDarkPassbandCount = *reinterpret_cast<const uint32_t*>(
-					context->darkAmbienceStimFrame->get().slotDesc.vaddr);
+					darkAmbienceStimFrame->get().slotDesc.vaddr);
 				logDarkAmbience = true;
 			}
 		}
 #endif
 
 	// Release intensity frame if it was used
-		if (context->intensityStimFrame.has_value()) {
+	if (intensityStimFrame.has_value()) {
-			context->intensityStimFrame->get().lock.writeRelease();
+		intensityStimFrame->get().lock.writeRelease();
 	}
 	// Release ambience frames if they were used
-		if (context->lightAmbienceStimFrame.has_value()) {
+	if (lightAmbienceStimFrame.has_value()) {
-			context->lightAmbienceStimFrame->get().lock.writeRelease();
+		lightAmbienceStimFrame->get().lock.writeRelease();
 	}
-		if (context->darkAmbienceStimFrame.has_value()) {
+	if (darkAmbienceStimFrame.has_value()) {
-			context->darkAmbienceStimFrame->get().lock.writeRelease();
+		darkAmbienceStimFrame->get().lock.writeRelease();
 	}
 
-		sscl::SpinLock::Guard guard(
-			pcloudProducer.stimulusProducerCanceler.s.lock);
-		if (pcloudProducer.stimulusProducerCanceler
-			.isCancellationRequestedUnlocked())
 	{
-			callOriginalCallback();
+		sscl::SpinLock::Guard guard(stimulusProducerCanceler.s.lock);
-			return;
+		if (stimulusProducerCanceler.isCancellationRequestedUnlocked())
-		}
+			{ co_return; }
 
-		if (!success) {
+		if (!compactCollateSuccess) {
-			std::cerr << __func__ << ": Failed to compact and collate frame" << std::endl;
+			std::cerr << "produceFrameReq3_compactCollateDone"
+				<< ": Failed to compact and collate frame" << std::endl;
 		} else
 		{
 			guard.unlockPrematurely();
-			if (pcloudProducer.pcloudFrameDumper.isEnabled())
+			if (pcloudFrameDumper.isEnabled())
 			{
 				try
 				{
-					pcloudProducer.pcloudFrameDumper.dumpProducedFrame(
+					pcloudFrameDumper.dumpProducedFrame(
-						*pcloudProducer.device,
+						*device, collationBuffer,
-						pcloudProducer.collationBuffer,
+						frameAssemblyResult);
-						context->frameAssemblyResult);
 				}
 				catch (const std::exception& e)
 				{
@@ -653,7 +641,7 @@ public:
 			if (logLightAmbience)
 			{
 				auto lightBuff =
-					pcloudProducer.lightAmbienceStimulusBuffer.load(
+					lightAmbienceStimulusBuffer.load(
 						std::memory_order_acquire);
 				if (lightBuff)
 				{
@@ -687,7 +675,7 @@ public:
 			if (logDarkAmbience)
 			{
 				auto darkBuff =
-					pcloudProducer.darkAmbienceStimulusBuffer.load(
+					darkAmbienceStimulusBuffer.load(
 						std::memory_order_acquire);
 				if (darkBuff)
 				{
@@ -728,12 +716,12 @@ public:
 				std::chrono::duration_cast<std::chrono::milliseconds>(
 					logNow.time_since_epoch()) % 1000;
 			auto assemblyDuration =
-				pcloudProducer.ioUringAssemblyEngine.getAssemblyDuration();
+				ioUringAssemblyEngine.getAssemblyDuration();
 			auto compactDuration =
-				pcloudProducer.openClCollatingAndMeshingEngine
+				openClCollatingAndMeshingEngine
 					.getCompactKernelDuration();
 			auto collateDuration =
-				pcloudProducer.openClCollatingAndMeshingEngine
+				openClCollatingAndMeshingEngine
 					.getCollateKernelDuration();
 			std::cout << std::put_time(std::localtime(&logTime), "%T")
 				<< '.' << std::setfill('0') << std::setw(3)
@@ -745,29 +733,9 @@ public:
 				<< "ms" << std::endl;
 #endif
 		}
-
-		callOriginalCallback();
 	}
-};
 
-void PcloudStimulusProducer::produceFrameReq(
+	co_return;
-	sscl::cps::Callback<produceFrameReqCbFn> callback)
-{
-	/**	EXPLANATION:
-	 * We shouldn't acquire stimulusProducerCanceler.s.lock here because
-	 * this function is called from
-	 * StimulusProducer::stimFrameProductionTimesliceInd(), which is already
-	 * holding the lock.
-	 */
-	auto caller = smoHooksPtr->ComponentThread_getSelf();
-	auto request = std::make_shared<ProduceFrameReq>(
-		*this, caller, std::move(callback));
-
-	// Post the doAssemble method to the component thread
-	boost::asio::post(device->componentThread->getIoContext(),
-		STC(std::bind(
-			&ProduceFrameReq::produceFrameReq1_doAssemble_posted,
-			request.get(), request)));
 }
 
 } // namespace stim_buff

stimBuffApis/livoxGen1/pcloudStimulusProducer.h

@@ -3,11 +3,12 @@
 
 #include <functional>
 #include <atomic>
+#include <optional>
+#include <exception>
 #include <user/stimulusProducer.h>
 #include <user/stimulusFrame.h>
 #include <livoxProto1/device.h>
-#include <spinscale/cps/asynchronousContinuation.h>
+#include <spinscale/co/invokers.h>
-#include <spinscale/cps/callback.h>
 #include <user/stagingBuffer.h>
 #include "ioUringAssemblyEngine.h"
 #include "livoxPcloudFrameDumper.h"
@@ -83,12 +84,13 @@ public:
 protected:
 	void stimFrameProductionTimesliceInd() override;
 
-	// Callback function type for produceFrameReq
+	void holdProduceFrameCReq();
-	typedef std::function<void()> produceFrameReqCbFn;
+
+	sscl::co::NonViralNonPostingInvoker produceFrameCReq(
+		std::exception_ptr& exceptionPtr,
+		std::function<void()> completion);
 
 public:
-	void produceFrameReq(sscl::cps::Callback<produceFrameReqCbFn> callback);
-
 	size_t nDgramsPerStagingBufferFrame;
 	std::shared_ptr<livoxProto1::Device> device;
 	PcloudFormatDesc formatDesc;
@@ -111,8 +113,8 @@ public:
 	std::atomic<std::shared_ptr<PcloudDarkAmbienceStimulusBuffer>>
 		darkAmbienceStimulusBuffer;
 
-private:
+	std::optional<sscl::co::NonViralNonPostingInvoker> activeProduceFrameInvoker;
-	class ProduceFrameReq;
+	std::exception_ptr produceFrameExceptionPtr;
 };
 
 } // namespace stim_buff