oneTBB 2021 Compatibility

Changes

@@ -1,7 +1,15 @@
 10.7.x.x (relative to 10.7.0.0a1)
 ========
 
+Improvements
+------------
+
+- TBB : Improved compatibility with oneTBB 2021.
+
+Breaking Changes
+----------------
 
+- IECore : Removed `tbb_task_scheduler_init()` Python Context Manager. Use `tbb_global_control()` instead.
 
 10.7.0.0a1 (relative to 10.6.2.1)
 ==========

include/IECoreScene/private/PrimitiveAlgoUtils.h

@@ -170,124 +170,107 @@ struct FillVectorFromValue
 	size_t m_len;
 };
 
-/// template to dispatch only primvars which are supported by the SplitTask
+/// template to dispatch only primvars which are supported by splitPrimitive
 /// Numeric & string like arrays, which contain elements which can be added to a std::set
 template<typename T> struct IsDeletablePrimVar : boost::mpl::or_< IECore::TypeTraits::IsStringVectorTypedData<T>, IECore::TypeTraits::IsNumericVectorTypedData<T> > {};
 
 
 template<typename T, typename S, typename P>
-class SplitTask : public tbb::task
+void splitPrimitive( const std::vector<T> &segments, typename P::Ptr primitive, const S& splitter, const std::string &primvarName, std::vector<typename P::Ptr> &outputPrimitives, size_t offset, size_t depth, const IECore::Canceller *canceller, tbb::task_group_context &taskGroupContext )
 {
-	private:
-		typedef typename P::Ptr Ptr;
-	public:
-		SplitTask(const std::vector<T> &segments, typename P::Ptr primitive, const S& splitter, const std::string &primvarName, std::vector<Ptr> &outputPrimitives, size_t offset, size_t depth, const IECore::Canceller *canceller )
-			: m_segments(segments), m_primitive(primitive), m_splitter(splitter), m_primvarName(primvarName), m_outputPrimitives( outputPrimitives ), m_offset(offset), m_depth(depth), m_canceller( canceller )
-		{
-		}
-
-		task *execute() override
-		{
-
-			if ( numPrimitives ( m_primitive.get() ) == 0 && !m_segments.empty() )
-			{
-				m_outputPrimitives[m_offset] = m_primitive;
-				return nullptr;
-			}
-
-			if ( m_segments.size () == 0 )
-			{
-				return nullptr;
-			}
-
-			size_t offset = m_segments.size() / 2;
-			typename std::vector<T>::iterator mid = m_segments.begin() + offset;
-
-			IECoreScene::PrimitiveVariable segmentPrimVar = m_primitive->variables.find( m_primvarName )->second;
+	using Ptr = typename P::Ptr;
 
-			std::vector<T> lowerSegments (m_segments.begin(), mid);
-			std::vector<T> upperSegments (mid, m_segments.end());
-
-			std::set<T> lowerSegmentsSet ( m_segments.begin(), mid );
-			std::set<T> upperSegmentsSet (mid, m_segments.end());
+	if( numPrimitives( primitive.get() ) == 0 && !segments.empty() )
+	{
+		outputPrimitives[offset] = primitive;
+		return;
+	}
 
-			const auto &readable = IECore::runTimeCast<IECore::TypedData<std::vector<T> > >( segmentPrimVar.data )->readable();
+	if( segments.size() == 0 )
+	{
+		return;
+	}
 
-			IECore::BoolVectorDataPtr deletionArrayLower = new IECore::BoolVectorData();
-			auto &writableLower = deletionArrayLower->writable();
+	size_t midOffset = segments.size() / 2;
 
-			IECore::BoolVectorDataPtr deletionArrayUpper = new IECore::BoolVectorData();
-			auto &writableUpper = deletionArrayUpper->writable();
+	IECoreScene::PrimitiveVariable segmentPrimVar = primitive->variables.find( primvarName )->second;
 
-			size_t deleteCount = 0;
-			if( segmentPrimVar.indices )
-			{
-				auto &readableIndices = segmentPrimVar.indices->readable();
-				writableLower.resize( readableIndices.size() );
-				writableUpper.resize( readableIndices.size() );
+	std::vector<T> lowerSegments( segments.begin(), segments.begin() + midOffset );
+	std::vector<T> upperSegments( segments.begin() + midOffset, segments.end() );
 
-				for( size_t i = 0; i < readableIndices.size(); ++i )
-				{
-					size_t index = readableIndices[i];
-					writableLower[i] = lowerSegmentsSet.find( readable[index] ) == lowerSegmentsSet.end();
-					writableUpper[i] = upperSegmentsSet.find( readable[index] ) == upperSegmentsSet.end();
-
-					deleteCount += ( writableLower[i] && !lowerSegments.empty() ) || ( writableUpper[i] && !upperSegments.empty() ) ? 1 : 0;
-				}
-			}
-			else
-			{
-				writableLower.resize( readable.size() );
-				writableUpper.resize( readable.size() );
-
-				for( size_t i = 0; i < readable.size(); ++i )
-				{
-					writableLower[i] = lowerSegmentsSet.find( readable[i] ) == lowerSegmentsSet.end();
-					writableUpper[i] = upperSegmentsSet.find( readable[i] ) == upperSegmentsSet.end();
-					deleteCount += ( writableLower[i] && !lowerSegments.empty() ) || ( writableUpper[i] && !upperSegments.empty() ) ? 1 : 0;
-				}
-			}
+	std::set<T> lowerSegmentsSet( lowerSegments.begin(), lowerSegments.end() );
+	std::set<T> upperSegmentsSet( upperSegments.begin(), upperSegments.end() );
 
-			if ( m_segments.size() == 1 && deleteCount == 0)
-			{
-				m_outputPrimitives[m_offset] = m_primitive;
-				return nullptr;
-			}
+	const auto &readable = IECore::runTimeCast<IECore::TypedData<std::vector<T> > >( segmentPrimVar.data )->readable();
 
-			IECoreScene::PrimitiveVariable::Interpolation i = splitPrimvarInterpolation( m_primitive.get() );
+	IECore::BoolVectorDataPtr deletionArrayLower = new IECore::BoolVectorData();
+	auto &writableLower = deletionArrayLower->writable();
 
-			IECoreScene::PrimitiveVariable delPrimVarLower( i, deletionArrayLower );
-			Ptr a = m_splitter( m_primitive.get(), delPrimVarLower, false, m_canceller ) ;
+	IECore::BoolVectorDataPtr deletionArrayUpper = new IECore::BoolVectorData();
+	auto &writableUpper = deletionArrayUpper->writable();
 
-			IECoreScene::PrimitiveVariable delPrimVarUpper( i, deletionArrayUpper);
-			Ptr b = m_splitter( m_primitive.get(), delPrimVarUpper, false, m_canceller ) ;
+	size_t deleteCount = 0;
+	if( segmentPrimVar.indices )
+	{
+		auto &readableIndices = segmentPrimVar.indices->readable();
+		writableLower.resize( readableIndices.size() );
+		writableUpper.resize( readableIndices.size() );
 
-			size_t numSplits = 2;
+		for( size_t i = 0; i < readableIndices.size(); ++i )
+		{
+			size_t index = readableIndices[i];
+			writableLower[i] = lowerSegmentsSet.find( readable[index] ) == lowerSegmentsSet.end();
+			writableUpper[i] = upperSegmentsSet.find( readable[index] ) == upperSegmentsSet.end();
 
-			set_ref_count( 1 + numSplits);
+			deleteCount += ( writableLower[i] && !lowerSegments.empty() ) || ( writableUpper[i] && !upperSegments.empty() ) ? 1 : 0;
+		}
+	}
+	else
+	{
+		writableLower.resize( readable.size() );
+		writableUpper.resize( readable.size() );
 
-			SplitTask *tA = new( allocate_child() ) SplitTask( lowerSegments, a, m_splitter,  m_primvarName, m_outputPrimitives, m_offset, m_depth + 1, m_canceller);
-			spawn( *tA );
+		for( size_t i = 0; i < readable.size(); ++i )
+		{
+			writableLower[i] = lowerSegmentsSet.find( readable[i] ) == lowerSegmentsSet.end();
+			writableUpper[i] = upperSegmentsSet.find( readable[i] ) == upperSegmentsSet.end();
+			deleteCount += ( writableLower[i] && !lowerSegments.empty() ) || ( writableUpper[i] && !upperSegments.empty() ) ? 1 : 0;
+		}
+	}
 
-			SplitTask *tB = new( allocate_child() ) SplitTask( upperSegments, b, m_splitter, m_primvarName, m_outputPrimitives, m_offset + offset, m_depth + 1, m_canceller );
-			spawn( *tB );
+	if( segments.size() == 1 && deleteCount == 0 )
+	{
+		outputPrimitives[offset] = primitive;
+		return;
+	}
 
-			wait_for_all();
+	IECoreScene::PrimitiveVariable::Interpolation i = splitPrimvarInterpolation( primitive.get() );
 
-			return nullptr;
-		}
+	IECoreScene::PrimitiveVariable delPrimVarLower( i, deletionArrayLower );
+	Ptr a = splitter( primitive.get(), delPrimVarLower, false, canceller );
 
-	private:
+	IECoreScene::PrimitiveVariable delPrimVarUpper( i, deletionArrayUpper);
+	Ptr b = splitter( primitive.get(), delPrimVarUpper, false, canceller );
 
-		std::vector<T> m_segments;
-		typename P::Ptr m_primitive;
-		const S &m_splitter;
-		std::string m_primvarName;
-		std::vector<Ptr> &m_outputPrimitives;
-		size_t m_offset;
-		size_t m_depth;
-		const IECore::Canceller *m_canceller;
-};
+	tbb::parallel_for(
+		tbb::blocked_range<size_t>( 0, 2 ),
+		[&]( const tbb::blocked_range<size_t> &r )
+		{
+			for( size_t i = r.begin(); i != r.end(); ++i )
+			{
+				if( i == 0 )
+				{
+					splitPrimitive<T, S, P>( lowerSegments, a, splitter, primvarName, outputPrimitives, offset, depth + 1, canceller, taskGroupContext );
+				}
+				else
+				{
+					splitPrimitive<T, S, P>( upperSegments, b, splitter, primvarName, outputPrimitives, offset + midOffset, depth + 1, canceller, taskGroupContext );
+				}
+			}
+		},
+		taskGroupContext
+	);
+}
 
 template<typename P, typename S>
 class TaskSegmenter
@@ -323,17 +306,17 @@ class TaskSegmenter
 			ReturnType results( segmentsReadable.size() );
 
 			tbb::task_group_context taskGroupContext( tbb::task_group_context::isolated );
-			SplitTask<T, S, P> *task = new( tbb::task::allocate_root( taskGroupContext ) ) SplitTask<T, S, P>(
+			splitPrimitive<T, S, P>(
 				segmentsReadable,
 				const_cast<P *>(m_primitive),
 				m_splitter,
 				m_primVarName,
 				results,
 				0,
 				0,
-				m_canceller
+				m_canceller,
+				taskGroupContext
 			);
-			tbb::task::spawn_root_and_wait( *task );
 
 			return results;
 

include/IECoreVDB/VDBObject.h

@@ -53,8 +53,6 @@ IECORE_PUSH_DEFAULT_VISIBILITY
 #include "Imath/ImathBox.h"
 IECORE_POP_DEFAULT_VISIBILITY
 
-#include "tbb/recursive_mutex.h"
-
 #include <unordered_map>
 
 namespace IECoreVDB

src/IECore/IndexedIOAlgo.cpp

@@ -34,7 +34,8 @@
 
 #include "IECore/IndexedIOAlgo.h"
 
-#include "tbb/task.h"
+#include "tbb/blocked_range.h"
+#include "tbb/parallel_for.h"
 
 #include <atomic>
 
@@ -227,59 +228,52 @@ void recursiveCopy( const IndexedIO *src, IndexedIO *dst )
 	}
 }
 
-//! Task for traversing all files in parallel. New tasks are spawned for each directory
+//! Traverse all files in parallel.
 template<template<typename, typename> class FileHandler, typename FileCallback>
-class FileTask : public tbb::task
+void parallelFileWalk( const IndexedIO *src, FileCallback &fileCallback, tbb::task_group_context &taskGroupContext )
 {
+	IndexedIO::EntryIDList fileNames;
+	src->entryIds( fileNames, IndexedIO::EntryType::File );
 
-	public :
-
-		FileTask( const IndexedIO *src, FileCallback &fileCallback )
-		: m_src( src ), m_fileCallback( fileCallback )
-		{
-		}
-
-		~FileTask() override
-		{
-		}
-
-		task *execute() override
-		{
-			IndexedIO::EntryIDList fileNames;
-			m_src->entryIds( fileNames, IndexedIO::EntryType::File );
-
-			for( const auto &fileName : fileNames )
-			{
-				handleFile<FileHandler, FileCallback>( m_src, nullptr, fileName, m_fileCallback );
-			}
-
-			IndexedIO::EntryIDList directoryNames;
-			m_src->entryIds( directoryNames, IndexedIO::EntryType::Directory );
+	for( const auto &fileName : fileNames )
+	{
+		handleFile<FileHandler, FileCallback>( src, nullptr, fileName, fileCallback );
+	}
 
-			set_ref_count( 1 + directoryNames.size() );
+	IndexedIO::EntryIDList directoryNames;
+	src->entryIds( directoryNames, IndexedIO::EntryType::Directory );
+	if( directoryNames.empty() )
+	{
+		return;
+	}
 
-			std::vector<ConstIndexedIOPtr> childDirectories;
-			childDirectories.reserve(directoryNames.size());
-			for( const auto &directoryName : directoryNames )
-			{
-				childDirectories.push_back( m_src->subdirectory( directoryName, IndexedIO::ThrowIfMissing ) );
-			}
+	std::vector<ConstIndexedIOPtr> childDirectories;
+	childDirectories.reserve(directoryNames.size());
+	for( const auto &directoryName : directoryNames )
+	{
+		childDirectories.push_back( src->subdirectory( directoryName, IndexedIO::ThrowIfMissing ) );
+	}
 
-			for( const auto &childDirectory : childDirectories )
+	if( childDirectories.size() == 1 )
+	{
+		// Serial execution
+		parallelFileWalk<FileHandler, FileCallback>( childDirectories[0].get(), fileCallback, taskGroupContext );
+	}
+	else
+	{
+		tbb::parallel_for(
+			tbb::blocked_range<size_t>( 0, childDirectories.size() ),
+			[&]( const tbb::blocked_range<size_t> &r )
 			{
-				FileTask *t = new( allocate_child() ) FileTask( childDirectory.get() , m_fileCallback );
-				spawn( *t );
-			}
-
-			wait_for_all();
-
-			return nullptr;
-		}
-
-	private :
-		const IndexedIO *m_src;
-		FileCallback &m_fileCallback;
-};
+				for( size_t i = r.begin(); i != r.end(); ++i )
+				{
+					parallelFileWalk<FileHandler, FileCallback>( childDirectories[i].get(), fileCallback, taskGroupContext );
+				}
+			},
+			taskGroupContext
+		);
+	}
+}
 
 } // namespace
 
@@ -303,8 +297,7 @@ FileStats<size_t> parallelReadAll( const IndexedIO *src )
 	};
 
 	tbb::task_group_context taskGroupContext( tbb::task_group_context::isolated );
-	FileTask<Reader, decltype( fileCallback )> *task = new( tbb::task::allocate_root( taskGroupContext ) ) FileTask<Reader, decltype( fileCallback )>( src, fileCallback );
-	tbb::task::spawn_root_and_wait( *task );
+	parallelFileWalk<Reader, decltype( fileCallback )>( src, fileCallback, taskGroupContext );
 	return fileStats;
 }