<filename>tests/perf-tools/tau/tests/tbb/OptimizedParallelSumTree.cpp<gh_stars>1-10
/*
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    to the source code ("Material") are owned by Intel Corporation or its
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    by worldwide copyright laws and treaty provisions.  No part of the
    Material may be used, copied, reproduced, modified, published, uploaded,
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    Intel's prior express written permission.

    No license under any patent, copyright, trade secret or other
    intellectual property right is granted to or conferred upon you by
    disclosure or delivery of the Materials, either expressly, by
    implication, inducement, estoppel or otherwise.  Any license under such
    intellectual property rights must be express and approved by Intel in
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*/

#include "common.h"
#include "tbb/task.h"

class OptimizedSumTask: public tbb::task {
    Value* const sum;
    TreeNode* root;
    bool is_continuation;
    Value x, y;
public:
    OptimizedSumTask( TreeNode* root_, Value* sum_ ) : root(root_), sum(sum_), is_continuation(false) {
    }
    tbb::task* execute() {
        tbb::task* next = NULL;
        if( !is_continuation ) {
            if( root->node_count<1000 ) {
                *sum = SerialSumTree(root);
            } else {
                // Create tasks before spawning any of them.
                tbb::task* a = NULL;
                tbb::task* b = NULL;
                if( root->left )
                    a = new( allocate_child() ) OptimizedSumTask(root->left,&x);
                if( root->right )
                    b = new( allocate_child() ) OptimizedSumTask(root->right,&y);
                recycle_as_continuation();
                is_continuation = true;
                set_ref_count( (a!=NULL)+(b!=NULL) );
                if( a ) {
                    if( b ) spawn(*b);
                } else 
                    a = b;
                next = a;
            }
        } else {
            *sum = root->value;
            if( root->left ) *sum += x;
            if( root->right ) *sum += y;
        } 
        return next;
    }
};

Value OptimizedParallelSumTree( TreeNode* root ) {
    Value sum;
    OptimizedSumTask& a = *new(tbb::task::allocate_root()) OptimizedSumTask(root,&sum);
    tbb::task::spawn_root_and_wait(a);
    return sum;
}

