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/*
* Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
*
* 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.
*/
#include "nnkit/BackendPlugin.h"
#include <cassert>
#include <stdex/Memory.h>
#include <iostream>
// NOTE dlfcn.h is not a standard library
#include <dlfcn.h>
namespace nnkit
{
BackendPlugin::BackendPlugin(BackendPlugin &&plugin)
{
// Handle is transferd from 'binder' instance into this instance.
_handle = plugin._handle;
_entry = plugin._entry;
plugin._handle = nullptr;
plugin._entry = nullptr;
}
BackendPlugin::~BackendPlugin()
{
if (_handle != nullptr)
{
dlclose(_handle);
}
}
std::unique_ptr<Backend> BackendPlugin::create(const CmdlineArguments &args) const
{
return _entry(args);
}
std::unique_ptr<BackendPlugin> make_backend_plugin(const std::string &path)
{
if (path.empty())
{
throw std::runtime_error{"Backend library does not defined"};
}
void *handle;
BackendPlugin::Entry entry;
// NOTE Some backend (such as tflite) needs multithreading support (std::thread).
//
// std::thread in libstdc++.so includes weak symbols for pthread_XXX functions,
// and these weak symbols should be overridden by strong symbols in libpthread.so.
// If not, std::thread will not work correctly.
//
// RTLD_GLOBAL flag is necessary to allow weak symbols to be overridden.
handle = dlopen(path.c_str(), RTLD_LAZY | RTLD_GLOBAL);
if (handle == nullptr)
{
std::cerr << dlerror() << std::endl;
exit(1);
}
char *error;
entry = reinterpret_cast<BackendPlugin::Entry>(dlsym(handle, "make_backend"));
if ((error = dlerror()) != nullptr)
{
dlclose(handle);
std::cerr << error << std::endl;
exit(1);
}
return stdex::make_unique<BackendPlugin>(handle, entry);
}
} // namespace nnkit
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