
#ifndef __RCPP_PARALLEL__
#define __RCPP_PARALLEL__

// TinyThread implementation
#include "RcppParallel/TinyThread.h"

// Use TBB only where it's known to compile and work correctly
// (NOTE: Windows TBB is temporarily opt-in for packages for
// compatibility with CRAN packages not previously configured
// to link to TBB in Makevars.win)
// NOTE: match Linux via __linux__ rather than __gnu_linux__; the latter is
// only defined by glibc toolchains, which left TBB disabled by default on
// musl-based systems such as Alpine Linux (https://github.com/RcppCore/RcppParallel/issues/231)
#ifndef RCPP_PARALLEL_USE_TBB
# if defined(__APPLE__) || defined(__linux__) || (defined(__sun) && defined(__SVR4) && !defined(__sparc))
#  define RCPP_PARALLEL_USE_TBB 1
# else
#  define RCPP_PARALLEL_USE_TBB 0
# endif
#endif

#if RCPP_PARALLEL_USE_TBB
# include "RcppParallel/TBB.h"
#endif

#include "RcppParallel/Backend.h"
#include "RcppParallel/Fork.h"
#include "RcppParallel/RVector.h"
#include "RcppParallel/RMatrix.h"

namespace RcppParallel {

inline void parallelFor(std::size_t begin,
                        std::size_t end,
                        Worker& worker,
                        std::size_t grainSize = 1,
                        int numThreads = -1)
{
   grainSize = resolveValue("RCPP_PARALLEL_GRAIN_SIZE", grainSize, std::size_t(1));
   numThreads = resolveValue("RCPP_PARALLEL_NUM_THREADS", numThreads, -1);

#if RCPP_PARALLEL_USE_TBB
   if (internal::backend() == internal::BACKEND_TBB)
      tbbParallelFor(begin, end, worker, grainSize, numThreads);
   else
      ttParallelFor(begin, end, worker, grainSize);
#else
   ttParallelFor(begin, end, worker, grainSize);
#endif
}

template <typename Reducer>
inline void parallelReduce(std::size_t begin,
                           std::size_t end,
                           Reducer& reducer,
                           std::size_t grainSize = 1,
                           int numThreads = -1)
{
   grainSize = resolveValue("RCPP_PARALLEL_GRAIN_SIZE", grainSize, std::size_t(1));
   numThreads = resolveValue("RCPP_PARALLEL_NUM_THREADS", numThreads, -1);

#if RCPP_PARALLEL_USE_TBB
   if (internal::backend() == internal::BACKEND_TBB)
      tbbParallelReduce(begin, end, reducer, grainSize, numThreads);
   else
      ttParallelReduce(begin, end, reducer, grainSize);
#else
   ttParallelReduce(begin, end, reducer, grainSize);
#endif
}

} // end namespace RcppParallel

// TRUE and FALSE macros that may come with system headers on some systems
// But conflict with R.h (R_ext/Boolean.h)
// TRUE and FALSE macros should be undef in RcppParallel.h
#ifdef TRUE
  #undef TRUE
#endif
#ifdef FALSE
  #undef FALSE
#endif

#endif // __RCPP_PARALLEL__
