66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/*
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Copyright (c) 2005-2020 Intel Corporation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "common.h"
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#include "tbb/task.h"
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class OptimizedSumTask: public tbb::task {
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Value* const sum;
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TreeNode* root;
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bool is_continuation;
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Value x, y;
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public:
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OptimizedSumTask( TreeNode* root_, Value* sum_ ) : root(root_), sum(sum_), is_continuation(false) {
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}
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tbb::task* execute() /*override*/ {
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tbb::task* next = NULL;
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if( !is_continuation ) {
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if( root->node_count<1000 ) {
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*sum = SerialSumTree(root);
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} else {
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// Create tasks before spawning any of them.
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tbb::task* a = NULL;
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tbb::task* b = NULL;
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if( root->left )
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a = new( allocate_child() ) OptimizedSumTask(root->left,&x);
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if( root->right )
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b = new( allocate_child() ) OptimizedSumTask(root->right,&y);
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recycle_as_continuation();
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is_continuation = true;
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set_ref_count( (a!=NULL)+(b!=NULL) );
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if( a ) {
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if( b ) spawn(*b);
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} else
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a = b;
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next = a;
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}
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} else {
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*sum = root->value;
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if( root->left ) *sum += x;
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if( root->right ) *sum += y;
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}
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return next;
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}
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};
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Value OptimizedParallelSumTree( TreeNode* root ) {
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Value sum;
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OptimizedSumTask& a = *new(tbb::task::allocate_root()) OptimizedSumTask(root,&sum);
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tbb::task::spawn_root_and_wait(a);
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return sum;
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}
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