mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 21:33:55 +00:00
250 lines
8.8 KiB
C++
250 lines
8.8 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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//
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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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#ifndef vtk_m_cont_TryExecute_h
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#define vtk_m_cont_TryExecute_h
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#include <vtkm/cont/DeviceAdapterList.h>
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#include <vtkm/cont/DeviceAdapterTag.h>
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#include <vtkm/cont/Logging.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::cont::DeviceAdapterId,
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vtkm::cont::RuntimeDeviceTracker&,
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const std::string& functorName);
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template <typename DeviceTag, typename Functor, typename... Args>
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inline bool TryExecuteIfValid(std::true_type,
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DeviceTag tag,
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Functor&& f,
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vtkm::cont::DeviceAdapterId devId,
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vtkm::cont::RuntimeDeviceTracker& tracker,
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Args&&... args)
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{
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if ((tag == devId || devId == DeviceAdapterTagAny()) && 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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detail::HandleTryExecuteException(tag, tracker, vtkm::cont::TypeToString<Functor>());
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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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inline bool TryExecuteIfValid(std::false_type,
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DeviceTag,
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Functor&&,
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vtkm::cont::DeviceAdapterId,
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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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inline void operator()(DeviceTag tag,
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Functor&& f,
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vtkm::cont::DeviceAdapterId devId,
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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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ran = TryExecuteIfValid(std::integral_constant<bool, DeviceTag::IsEnabled>(),
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tag,
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std::forward<Functor>(f),
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devId,
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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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inline bool TryExecuteImpl(vtkm::cont::DeviceAdapterId devId,
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Functor&& functor,
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std::true_type,
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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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auto& tracker = vtkm::cont::GetRuntimeDeviceTracker();
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TryExecuteWrapper task;
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vtkm::ListForEach(task,
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list,
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std::forward<Functor>(functor),
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devId,
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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... Args>
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inline bool TryExecuteImpl(vtkm::cont::DeviceAdapterId devId,
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Functor&& functor,
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std::false_type,
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Args&&... args)
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{
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bool success = false;
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auto& tracker = vtkm::cont::GetRuntimeDeviceTracker();
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TryExecuteWrapper task;
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vtkm::ListForEach(task,
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VTKM_DEFAULT_DEVICE_ADAPTER_LIST(),
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std::forward<Functor>(functor),
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devId,
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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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} // namespace detail
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///@{
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/// \brief Try to execute a functor on a specific device selected at runtime.
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///
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/// This function takes a functor and a \c DeviceAdapterId which represents a
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/// specific device to attempt to run on at runtime. It also optionally accepts
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/// a set of devices to compile support for.
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///
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/// It then iterates over the set of devices finding which one matches the provided
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/// adapter Id and is also enabled in the runtime. The function will return true
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/// only if the device adapter was valid, and the task was successfully run.
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///
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/// The TryExecuteOnDevice is also able to perfectly forward arbitrary arguments onto the functor.
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/// These arguments must be placed after the optional device adapter list and will passed to
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/// 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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/// // Execute only on the device which corresponds to devId
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/// // Will not execute all if devId is
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/// vtkm::cont::TryExecuteOnDevice(devId, TryCallExample(), 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
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/// is used.
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///
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template <typename Functor>
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VTKM_CONT bool TryExecuteOnDevice(vtkm::cont::DeviceAdapterId devId, 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(devId, std::forward<Functor>(functor), std::false_type{});
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}
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template <typename Functor, typename Arg1, typename... Args>
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VTKM_CONT bool TryExecuteOnDevice(vtkm::cont::DeviceAdapterId devId,
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Functor&& functor,
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Arg1&& arg1,
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Args&&... args)
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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 = vtkm::internal::IsList<Arg1>;
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return detail::TryExecuteImpl(devId,
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std::forward<Functor>(functor),
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is_deviceAdapter{},
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std::forward<Arg1>(arg1),
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std::forward<Args>(args)...);
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}
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//@} //block doxygen all TryExecuteOnDevice functions
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///@{
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/// \brief Try to execute a functor on a set of devices until one succeeds.
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///
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/// This function takes a functor and optionally a set of devices to compile support.
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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.
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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 device adapter list and will passed
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/// 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 deviceId, or device list
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/// vtkm::cont::TryExecute(TryCallExample(), int{42});
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///
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/// // Executing with a device list
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/// using DeviceList = vtkm::List<vtkm::cont::DeviceAdapterTagSerial>;
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/// vtkm::cont::TryExecute(TryCallExample(), 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
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/// is used.
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///
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template <typename Functor, typename... Args>
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VTKM_CONT bool TryExecute(Functor&& functor, Args&&... args)
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{
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return TryExecuteOnDevice(
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vtkm::cont::DeviceAdapterTagAny(), std::forward<Functor>(functor), 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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