common.hpp

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/*
Copyright (c) 2015, Scott Zuyderduyn
All rights reserved.

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*/

//----------------------------------------------------------------------------
// ptr/common.hpp
//
// Classes and helper functions that are needed by smart and specialized
// pointers.
//
// Author: Scott D. Zuyderduyn, Ph.D. (scott.zuyderduyn@utoronto.ca)
//----------------------------------------------------------------------------
#ifndef ECUDA_PTR_COMMON_HPP
#define ECUDA_PTR_COMMON_HPP

#include "../global.hpp"

namespace ecuda {

namespace detail {

// this is hacky structure that takes any pointer (const or not)
// and casts it to void* so it can be used by the deleter dispose() method
// and other places that call cudaFree
template<typename T> struct void_cast;
template<typename T> struct void_cast<const T*> { __HOST__ __DEVICE__ inline void* operator()( const T* ptr ) { return reinterpret_cast<void*>( const_cast<T*>(ptr) ); } };
template<typename T> struct void_cast           { __HOST__ __DEVICE__ inline void* operator()( T ptr        ) { return reinterpret_cast<void*>(ptr); } };

} // namespace detail

template<typename T>
struct default_device_delete {

    __HOST__ __DEVICE__ default_device_delete() __NOEXCEPT__ {}

    template<typename U> __HOST__ __DEVICE__ default_device_delete( const default_device_delete<U>& src ) __NOEXCEPT__ {}

    __HOST__ __DEVICE__ inline void operator()( T* ptr ) const {
        #ifdef __CUDA_ARCH__
        //ptr = NULL;
        #else
        #ifndef __CUDACC__
        delete [] reinterpret_cast<char*>(ptr); // hacky as hell but this should be valid for most test cases
        #else
        if( ptr ) cudaFree( detail::void_cast<T*>()(ptr) );
        //if( ptr ) cudaFree(ptr);
        #endif // __CUDACC__
        #endif
    }

};

template<typename T>
struct default_host_delete {
    __HOST__ __DEVICE__ __CONSTEXPR__ default_host_delete() __NOEXCEPT__ {}
    template<typename U> __HOST__ __DEVICE__ default_host_delete( const default_host_delete<U>& src ) __NOEXCEPT__ {}
    __HOST__ __DEVICE__ inline void operator()( T* ptr ) const {
        #ifdef __CUDA_ARCH__
        #else
        #ifndef __CUDACC__
        delete [] reinterpret_cast<char*>(ptr);
        #else
        if( ptr ) cudaFreeHost( detail::void_cast<T*>()(ptr) );
        #endif
        #endif
    }
};

} // namespace ecuda


#endif