131 lines
3.8 KiB
C++
131 lines
3.8 KiB
C++
/*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
/** \file
|
|
* \ingroup bli
|
|
*/
|
|
|
|
#ifdef WITH_TBB
|
|
/* Quiet top level deprecation message, unrelated to API usage here. */
|
|
# if defined(WIN32) && !defined(NOMINMAX)
|
|
/* TBB includes Windows.h which will define min/max macros causing issues
|
|
* when we try to use std::min and std::max later on. */
|
|
# define NOMINMAX
|
|
# define TBB_MIN_MAX_CLEANUP
|
|
# endif
|
|
# include <tbb/blocked_range.h>
|
|
# include <tbb/parallel_for.h>
|
|
# include <tbb/parallel_for_each.h>
|
|
# include <tbb/parallel_invoke.h>
|
|
# include <tbb/parallel_reduce.h>
|
|
# include <tbb/task_arena.h>
|
|
# ifdef WIN32
|
|
/* We cannot keep this defined, since other parts of the code deal with this on their own, leading
|
|
* to multiple define warnings unless we un-define this, however we can only undefine this if we
|
|
* were the ones that made the definition earlier. */
|
|
# ifdef TBB_MIN_MAX_CLEANUP
|
|
# undef NOMINMAX
|
|
# endif
|
|
# endif
|
|
#endif
|
|
|
|
#include "BLI_index_range.hh"
|
|
#include "BLI_utildefines.h"
|
|
|
|
namespace blender::threading {
|
|
|
|
template<typename Range, typename Function>
|
|
void parallel_for_each(Range &range, const Function &function)
|
|
{
|
|
#ifdef WITH_TBB
|
|
tbb::parallel_for_each(range, function);
|
|
#else
|
|
for (auto &value : range) {
|
|
function(value);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
template<typename Function>
|
|
void parallel_for(IndexRange range, int64_t grain_size, const Function &function)
|
|
{
|
|
if (range.size() == 0) {
|
|
return;
|
|
}
|
|
#ifdef WITH_TBB
|
|
/* Invoking tbb for small workloads has a large overhead. */
|
|
if (range.size() >= grain_size) {
|
|
tbb::parallel_for(
|
|
tbb::blocked_range<int64_t>(range.first(), range.one_after_last(), grain_size),
|
|
[&](const tbb::blocked_range<int64_t> &subrange) {
|
|
function(IndexRange(subrange.begin(), subrange.size()));
|
|
});
|
|
return;
|
|
}
|
|
#else
|
|
UNUSED_VARS(grain_size);
|
|
#endif
|
|
function(range);
|
|
}
|
|
|
|
template<typename Value, typename Function, typename Reduction>
|
|
Value parallel_reduce(IndexRange range,
|
|
int64_t grain_size,
|
|
const Value &identity,
|
|
const Function &function,
|
|
const Reduction &reduction)
|
|
{
|
|
#ifdef WITH_TBB
|
|
return tbb::parallel_reduce(
|
|
tbb::blocked_range<int64_t>(range.first(), range.one_after_last(), grain_size),
|
|
identity,
|
|
[&](const tbb::blocked_range<int64_t> &subrange, const Value &ident) {
|
|
return function(IndexRange(subrange.begin(), subrange.size()), ident);
|
|
},
|
|
reduction);
|
|
#else
|
|
UNUSED_VARS(grain_size, reduction);
|
|
return function(range, identity);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Execute all of the provided functions. The functions might be executed in parallel or in serial
|
|
* or some combination of both.
|
|
*/
|
|
template<typename... Functions> void parallel_invoke(Functions &&...functions)
|
|
{
|
|
#ifdef WITH_TBB
|
|
tbb::parallel_invoke(std::forward<Functions>(functions)...);
|
|
#else
|
|
(functions(), ...);
|
|
#endif
|
|
}
|
|
|
|
/** See #BLI_task_isolate for a description of what isolating a task means. */
|
|
template<typename Function> void isolate_task(const Function &function)
|
|
{
|
|
#ifdef WITH_TBB
|
|
tbb::this_task_arena::isolate(function);
|
|
#else
|
|
function();
|
|
#endif
|
|
}
|
|
|
|
} // namespace blender::threading
|