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#ifndef __RCPP_PARALLEL_TBB__
#define __RCPP_PARALLEL_TBB__
#include "Common.h"
#ifndef TBB_PREVIEW_GLOBAL_CONTROL
# define TBB_PREVIEW_GLOBAL_CONTROL 1
#endif
#include <tbb/tbb.h>
#include <tbb/global_control.h>
#include <tbb/scalable_allocator.h>
namespace RcppParallel {
namespace {
struct TBBWorker
{
explicit TBBWorker(Worker& worker) : worker_(worker) {}
void operator()(const tbb::blocked_range<size_t>& r) const {
worker_(r.begin(), r.end());
}
private:
Worker& worker_;
};
template <typename Reducer>
struct TBBReducer
{
explicit TBBReducer(Reducer& reducer)
: pSplitReducer_(NULL), reducer_(reducer)
{
}
TBBReducer(TBBReducer& tbbReducer, tbb::split)
: pSplitReducer_(new Reducer(tbbReducer.reducer_, RcppParallel::Split())),
reducer_(*pSplitReducer_)
{
}
virtual ~TBBReducer() { delete pSplitReducer_; }
void operator()(const tbb::blocked_range<size_t>& r) {
reducer_(r.begin(), r.end());
}
void join(const TBBReducer& tbbReducer) {
reducer_.join(tbbReducer.reducer_);
}
private:
Reducer* pSplitReducer_;
Reducer& reducer_;
};
class TBBParallelForExecutor
{
public:
TBBParallelForExecutor(Worker& worker,
std::size_t begin,
std::size_t end,
std::size_t grainSize)
: worker_(worker),
begin_(begin),
end_(end),
grainSize_(grainSize)
{
}
void operator()() const
{
TBBWorker tbbWorker(worker_);
tbb::parallel_for(
tbb::blocked_range<std::size_t>(begin_, end_, grainSize_),
tbbWorker
);
}
private:
Worker& worker_;
std::size_t begin_;
std::size_t end_;
std::size_t grainSize_;
};
template <typename Reducer>
class TBBParallelReduceExecutor
{
public:
TBBParallelReduceExecutor(Reducer& reducer,
std::size_t begin,
std::size_t end,
std::size_t grainSize)
: reducer_(reducer),
begin_(begin),
end_(end),
grainSize_(grainSize)
{
}
void operator()() const
{
TBBReducer<Reducer> tbbReducer(reducer_);
tbb::parallel_reduce(
tbb::blocked_range<std::size_t>(begin_, end_, grainSize_),
tbbReducer
);
}
private:
Reducer& reducer_;
std::size_t begin_;
std::size_t end_;
std::size_t grainSize_;
};
class TBBArenaParallelForExecutor
{
public:
TBBArenaParallelForExecutor(tbb::task_group& group,
Worker& worker,
std::size_t begin,
std::size_t end,
std::size_t grainSize)
: group_(group),
worker_(worker),
begin_(begin),
end_(end),
grainSize_(grainSize)
{
}
void operator()() const
{
TBBParallelForExecutor executor(worker_, begin_, end_, grainSize_);
group_.run_and_wait(executor);
}
private:
tbb::task_group& group_;
Worker& worker_;
std::size_t begin_;
std::size_t end_;
std::size_t grainSize_;
};
template <typename Reducer>
class TBBArenaParallelReduceExecutor
{
public:
TBBArenaParallelReduceExecutor(tbb::task_group& group,
Reducer& reducer,
std::size_t begin,
std::size_t end,
std::size_t grainSize)
: group_(group),
reducer_(reducer),
begin_(begin),
end_(end),
grainSize_(grainSize)
{
}
void operator()() const
{
TBBParallelReduceExecutor<Reducer> executor(reducer_, begin_, end_, grainSize_);
group_.run_and_wait(executor);
}
private:
tbb::task_group& group_;
Reducer& reducer_;
std::size_t begin_;
std::size_t end_;
std::size_t grainSize_;
};
class ThreadStackSizeControl
{
public:
ThreadStackSizeControl()
: control_(nullptr)
{
int stackSize = resolveValue("RCPP_PARALLEL_STACK_SIZE", 0, 0);
if (stackSize > 0)
{
control_ = new tbb::global_control(
tbb::global_control::thread_stack_size,
stackSize
);
}
}
~ThreadStackSizeControl()
{
if (control_ != nullptr)
{
delete control_;
control_ = nullptr;
}
}
private:
// COPYING: not copyable
ThreadStackSizeControl(const ThreadStackSizeControl&);
ThreadStackSizeControl& operator=(const ThreadStackSizeControl&);
// private members
tbb::global_control* control_;
};
} // anonymous namespace
inline void tbbParallelFor(std::size_t begin,
std::size_t end,
Worker& worker,
std::size_t grainSize = 1,
int numThreads = tbb::task_arena::automatic)
{
ThreadStackSizeControl control;
tbb::task_arena arena(numThreads);
tbb::task_group group;
TBBArenaParallelForExecutor executor(group, worker, begin, end, grainSize);
arena.execute(executor);
}
template <typename Reducer>
inline void tbbParallelReduce(std::size_t begin,
std::size_t end,
Reducer& reducer,
std::size_t grainSize = 1,
int numThreads = tbb::task_arena::automatic)
{
ThreadStackSizeControl control;
tbb::task_arena arena(numThreads);
tbb::task_group group;
TBBArenaParallelReduceExecutor<Reducer> executor(group, reducer, begin, end, grainSize);
arena.execute(executor);
}
} // namespace RcppParallel
#endif // __RCPP_PARALLEL_TBB__
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