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/*
* Copyright 2018 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*! \file disjoint_sync_pool.h
* \brief A mutex-synchronized version of \p disjoint_unsynchronized_pool_resource.
*/
#pragma once
#include <thrust/detail/cpp11_required.h>
#if THRUST_CPP_DIALECT >= 2011
#include <mutex>
#include <thrust/mr/disjoint_pool.h>
namespace thrust
{
namespace mr
{
/*! \addtogroup memory_management Memory Management
* \addtogroup memory_management_classes Memory Management Classes
* \addtogroup memory_resources Memory Resources
* \ingroup memory_resources
* \{
*/
/*! A mutex-synchronized version of \p disjoint_unsynchronized_pool_resource. Uses \p std::mutex, and therefore requires C++11.
*
* \tparam Upstream the type of memory resources that will be used for allocating memory blocks to be handed off to the user
* \tparam Bookkeeper the type of memory resources that will be used for allocating bookkeeping memory
*/
template<typename Upstream, typename Bookkeeper>
struct disjoint_synchronized_pool_resource : public memory_resource<typename Upstream::pointer>
{
typedef disjoint_unsynchronized_pool_resource<Upstream, Bookkeeper> unsync_pool;
typedef std::lock_guard<std::mutex> lock_t;
typedef typename Upstream::pointer void_ptr;
public:
/*! Get the default options for a disjoint pool. These are meant to be a sensible set of values for many use cases,
* and as such, may be tuned in the future. This function is exposed so that creating a set of options that are
* just a slight departure from the defaults is easy.
*/
static pool_options get_default_options()
{
return unsync_pool::get_default_options();
}
/*! Constructor.
*
* \param upstream the upstream memory resource for allocations
* \param bookkeeper the upstream memory resource for bookkeeping
* \param options pool options to use
*/
disjoint_synchronized_pool_resource(Upstream * upstream, Bookkeeper * bookkeeper,
pool_options options = get_default_options())
: upstream_pool(upstream, bookkeeper, options)
{
}
/*! Constructor. Upstream and bookkeeping resources are obtained by calling \p get_global_resource for their types.
*
* \param options pool options to use
*/
disjoint_synchronized_pool_resource(pool_options options = get_default_options())
: upstream_pool(get_global_resource<Upstream>(), get_global_resource<Bookkeeper>(), options)
{
}
/*! Releases all held memory to upstream.
*/
void release()
{
lock_t lock(mtx);
upstream_pool.release();
}
THRUST_NODISCARD virtual void_ptr do_allocate(std::size_t bytes, std::size_t alignment = THRUST_MR_DEFAULT_ALIGNMENT) THRUST_OVERRIDE
{
lock_t lock(mtx);
return upstream_pool.do_allocate(bytes, alignment);
}
virtual void do_deallocate(void_ptr p, std::size_t n, std::size_t alignment = THRUST_MR_DEFAULT_ALIGNMENT) THRUST_OVERRIDE
{
lock_t lock(mtx);
upstream_pool.do_deallocate(p, n, alignment);
}
private:
std::mutex mtx;
unsync_pool upstream_pool;
};
/*! \}
*/
} // end mr
} // end thrust
#endif // THRUST_CPP_DIALECT >= 2011
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