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/*
* Copyright 2008-2013 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.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/system/detail/generic/temporary_buffer.h>
#include <thrust/detail/pointer.h>
#include <thrust/detail/malloc_and_free.h>
#include <thrust/pair.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{
template<typename T, typename DerivedPolicy>
__host__ __device__
thrust::pair<thrust::pointer<T,DerivedPolicy>, typename thrust::pointer<T,DerivedPolicy>::difference_type>
get_temporary_buffer(thrust::execution_policy<DerivedPolicy> &exec, typename thrust::pointer<T,DerivedPolicy>::difference_type n)
{
thrust::pointer<T,DerivedPolicy> ptr = thrust::malloc<T>(exec, n);
// check for a failed malloc
if(!ptr.get())
{
n = 0;
} // end if
return thrust::make_pair(ptr, n);
} // end get_temporary_buffer()
__thrust_exec_check_disable__
template<typename DerivedPolicy, typename Pointer>
__host__ __device__
void return_temporary_buffer(thrust::execution_policy<DerivedPolicy> &exec, Pointer p, std::ptrdiff_t)
{
// If we are here, no user customization of the three-argument signature with
// a size parameter of `return_temporary_buffer` was found. There may be an
// old two-argument signature `return_temporary_buffer` though, so we make
// another ADL call to try and find one.
//
// The interface layer downcast and then did ADL dispatch - there were no
// matches for DerivedPolicy (aka no one customized the three-argument
// signature), so this overload got found an implicit upcast to
// `execution_policy<DerivedPolicy>` was done. Now, we're looking for a
// customization of the two-argument signature so we need to downcast again.
return_temporary_buffer(thrust::detail::derived_cast(thrust::detail::strip_const(exec)), p);
} // end return_temporary_buffer()
__thrust_exec_check_disable__
template<typename DerivedPolicy, typename Pointer>
__host__ __device__
void return_temporary_buffer(thrust::execution_policy<DerivedPolicy> &exec, Pointer p)
{
// If we are here, no user customization of either the old two-argument
// signature or the new three-argument signature with a size parameter of
// `return_temporary_buffer` was found.
thrust::free(exec, p);
} // end return_temporary_buffer()
} // end generic
} // end detail
} // end system
THRUST_NAMESPACE_END
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