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/*=========================================================================
Program: Visualization Toolkit
Module: vtkSMPToolsInternal.h.in
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkMultiThreader.h"
#include "vtkNew.h"
VTKCOMMONCORE_EXPORT std::vector<vtkMultiThreaderIDType>& vtkSMPToolsGetThreadIds();
VTKCOMMONCORE_EXPORT void vtkSMPToolsInitialize();
VTKCOMMONCORE_EXPORT int vtkSMPToolsGetNumberOfThreads();
namespace vtk
{
namespace detail
{
namespace smp
{
template <typename T>
void vtkSMPToolsForEach(vtkIdType first,
vtkIdType last,
T* op,
int grain)
{
vtkIdType n = last - first;
if (!n)
{
return;
}
if (grain == 0 || grain >= n)
{
op->Execute(first, last);
}
else
{
vtkIdType b = first;
while (b < last)
{
vtkIdType e = b + grain;
if (e > last)
{
e = last;
}
//cout << b << " " << e << endl;
op->Execute(b, e);
b = e;
}
}
}
struct vtkSMPToolsExecuteArgs
{
vtkIdType First;
vtkIdType Last;
void* Functor;
int Grain;
};
template <typename T>
VTK_THREAD_RETURN_TYPE vtkSMPToolsExecute(void *varg)
{
vtkMultiThreader::ThreadInfo* arg =
static_cast<vtkMultiThreader::ThreadInfo*>(varg);
int threadId = arg->ThreadID;
int threadCount = arg->NumberOfThreads;
std::vector<vtkMultiThreaderIDType>& threadIds =
vtkSMPToolsGetThreadIds();
threadIds[threadId] = vtkMultiThreader::GetCurrentThreadID();
//pthread_barrier_wait(&barr);
vtkSMPToolsExecuteArgs* fargs =
static_cast<vtkSMPToolsExecuteArgs*>(arg->UserData);
vtkIdType n = fargs->Last - fargs->First;
if (n > threadCount)
{
vtkIdType count = n / threadCount;
vtkIdType begin = fargs->First + count*threadId;
vtkIdType end;
if (threadId == threadCount - 1)
{
end = fargs->Last;
}
else
{
end = begin + count;
}
vtkSMPToolsForEach(begin, end, (T*)(fargs->Functor), fargs->Grain);
}
else
{
if (threadId == 0)
{
cerr << "0 executing all" << endl;
}
}
return VTK_THREAD_RETURN_VALUE;
}
template <typename FunctorInternal>
static void vtkSMPTools_Impl_For(
vtkIdType first, vtkIdType last, vtkIdType grain,
FunctorInternal& fi)
{
vtkSMPToolsInitialize();
vtkSMPToolsExecuteArgs args;
args.First = first;
args.Last = last;
args.Functor = (void*)(&fi);
args.Grain = grain;
//pthread_barrier_init(&barr, NULL, vtkSMPToolsNumberOfThreads);
vtkNew<vtkMultiThreader> threader;
threader->SetNumberOfThreads(vtkSMPToolsGetNumberOfThreads());
threader->SetSingleMethod(vtkSMPToolsExecute<FunctorInternal>, &args);
threader->SingleMethodExecute();
//pthread_barrier_destroy(&barr);
}
}
}
}
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