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#ifndef __RCPP_PARALLEL_BACKEND__
#define __RCPP_PARALLEL_BACKEND__
#include <cstdlib>
#include <cstring>
extern "C" {
void REprintf(const char*, ...);
}
namespace RcppParallel {
namespace internal {
enum backend_type {
BACKEND_TBB,
BACKEND_TINYTHREAD
};
#if RCPP_PARALLEL_USE_TBB
inline backend_type defaultBackend()
{
return BACKEND_TBB;
}
#else
inline backend_type defaultBackend()
{
return BACKEND_TINYTHREAD;
}
#endif
inline const char* backendToString(backend_type backend)
{
switch (backend)
{
case BACKEND_TBB:
return "tbb";
case BACKEND_TINYTHREAD:
return "tinythread";
}
// shouldn't be reached but need to silence compiler warnings
return "tbb";
}
inline backend_type backend()
{
const char* requestedBackend = std::getenv("RCPP_PARALLEL_BACKEND");
if (requestedBackend == NULL)
{
return defaultBackend();
}
else if (std::strcmp(requestedBackend, "tbb") == 0)
{
#if RCPP_PARALLEL_USE_TBB
return BACKEND_TBB;
#else
const char* msg =
"tbb backend is not available; using tinythread instead";
REprintf("%s\n", msg);
return BACKEND_TINYTHREAD;
#endif
}
else if (strcmp(requestedBackend, "tinythread") == 0)
{
return BACKEND_TINYTHREAD;
}
else
{
const char* fmt = "unknown parallel backend '%s'; using '%s' instead\n";
REprintf(fmt, requestedBackend, backendToString(defaultBackend()));
return defaultBackend();
}
}
} // namespace internal
} // namespace RcppParallel
#endif /* __RCPP_PARALLEL_BACKEND__ */
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