mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
261 lines
9.8 KiB
C++
261 lines
9.8 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2016 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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// Copyright 2016 UT-Battelle, LLC.
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// Copyright 2016 Los Alamos National Security.
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//
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// Under the terms of Contract DE-NA0003525 with NTESS,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_cont_TryExecute_h
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#define vtk_m_cont_TryExecute_h
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#include <vtkm/cont/DeviceAdapterListTag.h>
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#include <vtkm/cont/RuntimeDeviceTracker.h>
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namespace vtkm
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{
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namespace cont
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{
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namespace detail
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{
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VTKM_CONT_EXPORT void HandleTryExecuteException(vtkm::Int8,
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const std::string&,
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vtkm::cont::RuntimeDeviceTracker&);
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template <typename DeviceTag, typename Functor, typename... Args>
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bool TryExecuteIfValid(std::true_type,
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DeviceTag tag,
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Functor&& f,
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vtkm::cont::RuntimeDeviceTracker& tracker,
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Args&&... args)
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{
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if (tracker.CanRunOn(tag))
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{
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try
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{
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return f(tag, std::forward<Args>(args)...);
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}
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catch (...)
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{
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using Traits = vtkm::cont::DeviceAdapterTraits<DeviceTag>;
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HandleTryExecuteException(Traits::GetId(), Traits::GetName(), tracker);
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}
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}
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// If we are here, then the functor was either never run or failed.
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return false;
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}
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template <typename DeviceTag, typename Functor, typename... Args>
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bool TryExecuteIfValid(std::false_type,
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DeviceTag,
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Functor&&,
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vtkm::cont::RuntimeDeviceTracker&,
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Args&&...)
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{
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return false;
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}
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struct TryExecuteWrapper
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{
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template <typename DeviceTag, typename Functor, typename... Args>
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void operator()(DeviceTag tag,
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Functor&& f,
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vtkm::cont::RuntimeDeviceTracker& tracker,
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bool& ran,
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Args&&... args) const
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{
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if (!ran)
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{
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using DeviceTraits = vtkm::cont::DeviceAdapterTraits<DeviceTag>;
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ran = TryExecuteIfValid(std::integral_constant<bool, DeviceTraits::Valid>(),
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tag,
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std::forward<Functor>(f),
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std::forward<decltype(tracker)>(tracker),
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std::forward<Args>(args)...);
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}
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}
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};
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template <typename Functor, typename DeviceList, typename... Args>
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VTKM_CONT bool TryExecuteImpl(Functor&& functor,
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std::true_type,
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std::true_type,
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vtkm::cont::RuntimeDeviceTracker tracker,
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DeviceList list,
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Args&&... args)
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{
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bool success = false;
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detail::TryExecuteWrapper task;
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vtkm::ListForEach(
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task, list, std::forward<Functor>(functor), tracker, success, std::forward<Args>(args)...);
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return success;
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}
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template <typename Functor, typename... Args>
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VTKM_CONT bool TryExecuteImpl(Functor&& functor, std::false_type, std::false_type, Args&&... args)
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{
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bool success = false;
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auto tracker = vtkm::cont::GetGlobalRuntimeDeviceTracker();
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detail::TryExecuteWrapper task;
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vtkm::ListForEach(task,
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VTKM_DEFAULT_DEVICE_ADAPTER_LIST_TAG(),
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std::forward<Functor>(functor),
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tracker,
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success,
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std::forward<Args>(args)...);
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return success;
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}
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template <typename Functor, typename Arg1, typename... Args>
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VTKM_CONT bool TryExecuteImpl(Functor&& functor,
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std::true_type t,
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std::false_type,
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Arg1&& arg1,
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Args&&... args)
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{
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return TryExecuteImpl(std::forward<Functor>(functor),
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t,
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t,
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std::forward<Arg1>(arg1),
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VTKM_DEFAULT_DEVICE_ADAPTER_LIST_TAG(),
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std::forward<Args>(args)...);
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}
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template <typename Functor, typename Arg1, typename... Args>
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VTKM_CONT bool TryExecuteImpl(Functor&& functor,
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std::false_type,
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std::true_type t,
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Arg1&& arg1,
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Args&&... args)
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{
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auto tracker = vtkm::cont::GetGlobalRuntimeDeviceTracker();
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return TryExecuteImpl(std::forward<Functor>(functor),
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t,
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t,
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tracker,
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std::forward<Arg1>(arg1),
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std::forward<Args>(args)...);
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}
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} // namespace detail
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///@{
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/// \brief Try to execute a functor on a list of devices until one succeeds.
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///
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/// This function takes a functor and optionally a list of devices and \c RuntimeDeviceTracker.
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/// It then tries to run the functor for each device (in the order given in the list) until the
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/// execution succeeds. The optional \c RuntimeDeviceTracker allows for monitoring for certain
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/// failures across calls to TryExecute and skip trying devices with a history of failure.
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///
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/// The TryExecute is also able to perfectly forward arbitrary arguments onto the functor.
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/// These arguments must be placed after the optional \c RuntimeDeviceTracker, and device adapter
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/// list and will passed to the functor in the same order as listed.
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///
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/// The functor must implement the function call operator ( \c operator() ) with a return type of
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/// \c bool and that is \c true if the execution succeeds, \c false if it fails. If an exception
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/// is thrown from the functor, then the execution is assumed to have failed. The functor call
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/// operator must also take at least one argument being the required \c DeviceAdapterTag to use.
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///
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/// \code{.cpp}
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/// struct TryCallExample
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/// {
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/// template<typename DeviceList>
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/// bool operator()(DeviceList tags, int) const
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/// {
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/// return true;
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/// }
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/// };
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///
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///
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/// // Executing without a runtime tracker or device list
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/// vtkm::cont::TryExecute(TryCallExample(), int{42});
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///
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/// // Executing with a runtime tracker
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/// auto tracker = vtkm::cont::GetGlobalRuntimeDeviceTracker();
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/// vtkm::cont::TryExecute(TryCallExample(), tracker, int{42});
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///
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/// // Executing with a device list
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/// using DeviceList = vtkm::ListTagBase<vtkm::cont::DeviceAdapterTagSerial>;
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/// vtkm::cont::TryExecute(TryCallExample(), DeviceList(), int{42});
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///
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/// // Executing with a runtime tracker and device list
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/// vtkm::cont::TryExecute(EdgeCaseFunctor(), tracker, DeviceList(), int{42});
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///
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/// \endcode
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///
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/// This function returns \c true if the functor succeeded on a device,
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/// \c false otherwise.
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///
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/// If no device list is specified, then \c VTKM_DEFAULT_DEVICE_ADAPTER_LIST_TAG
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/// is used.
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///
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/// If no \c RuntimeDeviceTracker specified, then \c GetGlobalRuntimeDeviceTracker()
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/// is used.
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template <typename Functor>
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VTKM_CONT bool TryExecute(Functor&& functor)
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{
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//we haven't been passed either a runtime tracker or a device list
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return detail::TryExecuteImpl(functor, std::false_type{}, std::false_type{});
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}
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template <typename Functor, typename Arg1>
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VTKM_CONT bool TryExecute(Functor&& functor, Arg1&& arg1)
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{
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//determine if we are being passed a device adapter or runtime tracker as our argument
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using is_deviceAdapter = typename std::is_base_of<vtkm::detail::ListRoot, Arg1>::type;
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using is_tracker = typename std::is_base_of<vtkm::cont::RuntimeDeviceTracker,
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typename std::remove_reference<Arg1>::type>::type;
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return detail::TryExecuteImpl(
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functor, is_tracker{}, is_deviceAdapter{}, std::forward<Arg1>(arg1));
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}
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template <typename Functor, typename Arg1, typename Arg2, typename... Args>
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VTKM_CONT bool TryExecute(Functor&& functor, Arg1&& arg1, Arg2&& arg2, Args&&... args)
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{
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//So arg1 can be runtime or device adapter
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//if arg1 is runtime, we need to see if arg2 is device adapter
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using is_arg1_tracker =
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typename std::is_base_of<vtkm::cont::RuntimeDeviceTracker,
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typename std::remove_reference<Arg1>::type>::type;
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using is_arg2_devicelist = typename std::is_base_of<vtkm::detail::ListRoot, Arg2>::type;
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//We now know what of three states we are currently at
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using has_runtime_and_deviceAdapter =
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brigand::bool_<is_arg1_tracker::value && is_arg2_devicelist::value>;
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using has_just_runtime = brigand::bool_<is_arg1_tracker::value && !is_arg2_devicelist::value>;
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using has_just_devicelist = typename std::is_base_of<vtkm::detail::ListRoot, Arg1>::type;
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//With this information we can now compute if we have a runtime tracker and/or
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//the device adapter and enable the correct flags
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using first_true =
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brigand::bool_<has_runtime_and_deviceAdapter::value || has_just_runtime::value>;
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using second_true =
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brigand::bool_<has_runtime_and_deviceAdapter::value || has_just_devicelist::value>;
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return detail::TryExecuteImpl(functor,
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first_true{},
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second_true{},
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std::forward<Arg1>(arg1),
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std::forward<Arg2>(arg2),
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std::forward<Args>(args)...);
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}
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//@} //block doxygen all TryExecute functions
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}
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} // namespace vtkm::cont
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#endif //vtk_m_cont_TryExecute_h
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