mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-23 05:13:04 +03:00
173 lines
5.5 KiB
C++
173 lines
5.5 KiB
C++
//---------------------------------------------------------------------------//
|
|
// Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0
|
|
// See accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt
|
|
//
|
|
// See http://boostorg.github.com/compute for more information.
|
|
//---------------------------------------------------------------------------//
|
|
|
|
#ifndef BOOST_COMPUTE_UTILITY_PROGRAM_CACHE_HPP
|
|
#define BOOST_COMPUTE_UTILITY_PROGRAM_CACHE_HPP
|
|
|
|
#include <string>
|
|
#include <utility>
|
|
|
|
#include <boost/shared_ptr.hpp>
|
|
#include <boost/make_shared.hpp>
|
|
#include <boost/noncopyable.hpp>
|
|
|
|
#include <boost/compute/context.hpp>
|
|
#include <boost/compute/program.hpp>
|
|
#include <boost/compute/detail/lru_cache.hpp>
|
|
#include <boost/compute/detail/global_static.hpp>
|
|
|
|
namespace boost {
|
|
namespace compute {
|
|
|
|
/// The program_cache class stores \ref program objects in a LRU cache.
|
|
///
|
|
/// This class can be used to help mitigate the overhead of OpenCL's run-time
|
|
/// kernel compilation model. Commonly used programs can be stored persistently
|
|
/// in the cache and only compiled once on their first use.
|
|
///
|
|
/// Program objects are stored and retreived based on a user-defined cache key
|
|
/// along with the options used to build the program (if any).
|
|
///
|
|
/// For example, to insert a program into the cache:
|
|
/// \code
|
|
/// cache.insert("foo", foo_program);
|
|
/// \endcode
|
|
///
|
|
/// And to retreive the program later:
|
|
/// \code
|
|
/// boost::optional<program> p = cache.get("foo");
|
|
/// if(p){
|
|
/// // program found in cache
|
|
/// }
|
|
/// \endcode
|
|
///
|
|
/// \see program
|
|
class program_cache : boost::noncopyable
|
|
{
|
|
public:
|
|
/// Creates a new program cache with space for \p capacity number of
|
|
/// program objects.
|
|
program_cache(size_t capacity)
|
|
: m_cache(capacity)
|
|
{
|
|
}
|
|
|
|
/// Destroys the program cache.
|
|
~program_cache()
|
|
{
|
|
}
|
|
|
|
/// Returns the number of program objects currently stored in the cache.
|
|
size_t size() const
|
|
{
|
|
return m_cache.size();
|
|
}
|
|
|
|
/// Returns the total capacity of the cache.
|
|
size_t capacity() const
|
|
{
|
|
return m_cache.capacity();
|
|
}
|
|
|
|
/// Clears the program cache.
|
|
void clear()
|
|
{
|
|
m_cache.clear();
|
|
}
|
|
|
|
/// Returns the program object with \p key. Returns a null optional if no
|
|
/// program with \p key exists in the cache.
|
|
boost::optional<program> get(const std::string &key)
|
|
{
|
|
return m_cache.get(std::make_pair(key, std::string()));
|
|
}
|
|
|
|
/// Returns the program object with \p key and \p options. Returns a null
|
|
/// optional if no program with \p key and \p options exists in the cache.
|
|
boost::optional<program> get(const std::string &key, const std::string &options)
|
|
{
|
|
return m_cache.get(std::make_pair(key, options));
|
|
}
|
|
|
|
/// Inserts \p program into the cache with \p key.
|
|
void insert(const std::string &key, const program &program)
|
|
{
|
|
insert(key, std::string(), program);
|
|
}
|
|
|
|
/// Inserts \p program into the cache with \p key and \p options.
|
|
void insert(const std::string &key, const std::string &options, const program &program)
|
|
{
|
|
m_cache.insert(std::make_pair(key, options), program);
|
|
}
|
|
|
|
/// Loads the program with \p key from the cache if it exists. Otherwise
|
|
/// builds a new program with \p source and \p options, stores it in the
|
|
/// cache, and returns it.
|
|
///
|
|
/// This is a convenience function to simplify the common pattern of
|
|
/// attempting to load a program from the cache and, if not present,
|
|
/// building the program from source and storing it in the cache.
|
|
///
|
|
/// Equivalent to:
|
|
/// \code
|
|
/// boost::optional<program> p = get(key, options);
|
|
/// if(!p){
|
|
/// p = program::create_with_source(source, context);
|
|
/// p->build(options);
|
|
/// insert(key, options, *p);
|
|
/// }
|
|
/// return *p;
|
|
/// \endcode
|
|
program get_or_build(const std::string &key,
|
|
const std::string &options,
|
|
const std::string &source,
|
|
const context &context)
|
|
{
|
|
boost::optional<program> p = get(key, options);
|
|
if(!p){
|
|
p = program::build_with_source(source, context, options);
|
|
|
|
insert(key, options, *p);
|
|
}
|
|
return *p;
|
|
}
|
|
|
|
/// Returns the global program cache for \p context.
|
|
///
|
|
/// This global cache is used internally by Boost.Compute to store compiled
|
|
/// program objects used by its algorithms. All Boost.Compute programs are
|
|
/// stored with a cache key beginning with \c "__boost". User programs
|
|
/// should avoid using the same prefix in order to prevent collisions.
|
|
static boost::shared_ptr<program_cache> get_global_cache(const context &context)
|
|
{
|
|
typedef detail::lru_cache<cl_context, boost::shared_ptr<program_cache> > cache_map;
|
|
|
|
BOOST_COMPUTE_DETAIL_GLOBAL_STATIC(cache_map, caches, (8));
|
|
|
|
boost::optional<boost::shared_ptr<program_cache> > cache = caches.get(context.get());
|
|
if(!cache){
|
|
cache = boost::make_shared<program_cache>(64);
|
|
|
|
caches.insert(context.get(), *cache);
|
|
}
|
|
|
|
return *cache;
|
|
}
|
|
|
|
private:
|
|
detail::lru_cache<std::pair<std::string, std::string>, program> m_cache;
|
|
};
|
|
|
|
} // end compute namespace
|
|
} // end boost namespace
|
|
|
|
#endif // BOOST_COMPUTE_UTILITY_PROGRAM_CACHE_HPP
|