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// Copyright (c) 2018 GeometryFactory (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Point_set_processing_3/include/CGAL/Point_set_processing_3/internal/Callback_wrapper.h $
// $Id: include/CGAL/Point_set_processing_3/internal/Callback_wrapper.h b26b07a1242 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Simon Giraudot
#ifndef CGAL_PSP_INTERNAL_CALLBACK_WRAPPER_H
#define CGAL_PSP_INTERNAL_CALLBACK_WRAPPER_H
#include <CGAL/license/Point_set_processing_3.h>
#include <atomic>
#include <thread>
#include <functional>
namespace CGAL {
namespace Point_set_processing_3 {
namespace internal {
template <typename ConcurrencyTag>
class Callback_wrapper
{
std::size_t m_advancement;
bool m_interrupted;
public:
Callback_wrapper (const std::function<bool(double)>&, std::size_t, std::size_t, bool = false) { }
void reset (std::size_t, std::size_t, bool = false) { }
std::size_t& advancement() { return m_advancement; }
bool& interrupted() { return m_interrupted; }
void join() { }
};
template <>
class Callback_wrapper<CGAL::Sequential_tag>
{
const std::function<bool(double)>& m_callback;
std::size_t m_advancement;
bool m_interrupted;
std::size_t m_size;
public:
Callback_wrapper (const std::function<bool(double)>& callback,
std::size_t size,
std::size_t advancement = 0,
bool interrupted = false)
: m_callback (callback)
, m_advancement (advancement)
, m_interrupted (interrupted)
, m_size (size)
{ }
Callback_wrapper (const Callback_wrapper& other)
: m_callback (other.m_callback)
, m_advancement (other.m_advancement)
, m_interrupted (other.m_interrupted)
, m_size (other.m_size)
{ }
~Callback_wrapper () { }
void reset (std::size_t size, std::size_t advancement, bool interrupted = false)
{
m_size = size;
m_advancement = advancement;
m_interrupted = interrupted;
}
std::size_t& advancement()
{
return m_advancement;
}
bool& interrupted()
{
if (m_callback)
m_interrupted = !(m_callback(m_advancement / double(m_size)));
return m_interrupted;
}
void join() { }
};
#ifdef CGAL_LINKED_WITH_TBB
template <>
class Callback_wrapper<CGAL::Parallel_tag>
{
const std::function<bool(double)>& m_callback;
std::atomic<std::size_t>* m_advancement;
std::atomic<bool>* m_interrupted;
std::size_t m_size;
bool m_creator;
std::thread* m_thread;
// assignment operator shouldn't be used (m_callback is const ref)
Callback_wrapper& operator= (const Callback_wrapper&)
{
return *this;
}
public:
Callback_wrapper (const std::function<bool(double)>& callback,
std::size_t size,
std::size_t advancement = 0,
bool interrupted = false)
: m_callback (callback)
, m_advancement (new std::atomic<std::size_t>())
, m_interrupted (new std::atomic<bool>())
, m_size (size)
, m_creator (true)
, m_thread (nullptr)
{
// std::atomic only has default constructor, initialization done in two steps
*m_advancement = advancement;
*m_interrupted = interrupted;
if (m_callback)
m_thread = new std::thread (*this);
}
Callback_wrapper (const Callback_wrapper& other)
: m_callback (other.m_callback)
, m_advancement (other.m_advancement)
, m_interrupted (other.m_interrupted)
, m_size (other.m_size)
, m_creator (false)
, m_thread (nullptr)
{
}
~Callback_wrapper ()
{
if (m_creator)
{
delete m_advancement;
delete m_interrupted;
}
if (m_thread != nullptr)
delete m_thread;
}
void reset (std::size_t size, std::size_t advancement, bool interrupted = false)
{
m_size = size;
*m_advancement = advancement;
*m_interrupted = interrupted;
if (m_callback)
m_thread = new std::thread (*this);
}
std::atomic<std::size_t>& advancement() { return *m_advancement; }
std::atomic<bool>& interrupted() { return *m_interrupted; }
void join()
{
if (m_thread != nullptr)
m_thread->join();
}
void operator()()
{
while (*m_advancement != m_size)
{
if (m_callback && !m_callback (*m_advancement / double(m_size)))
*m_interrupted = true;
if (*m_interrupted)
return;
typedef std::chrono::nanoseconds nanoseconds;
nanoseconds ns (nanoseconds::rep (1000000000.0 * 0.00001));
std::this_thread::sleep_for(ns);
}
if (m_callback)
m_callback (1.);
}
};
#endif
} // namespace internal
} // namespace Point_set_processing_3
} // namespace CGAL
#endif // CGAL_PSP_INTERNAL_CALLBACK_WRAPPER_H
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