genn_lib.hpp

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/*
 *  Cypress -- C++ Spiking Neural Network Simulation Framework
 *  Copyright (C) 2019  Christoph Ostrau
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <stdexcept>
#include <string>
#include <vector>

#include <dlfcn.h>

#include <cypress/core/backend.hpp>
#include <cypress/util/json.hpp>
#include <cypress/util/logger.hpp>

namespace cypress {
class GENN_Lib {
private:
    typedef Backend *create_bs(Json setup);
    typedef void destroy_bs(Backend *bck);
    void *m_lib;
    GENN_Lib()
    {
        m_lib = dlopen("./libgennbck.so", RTLD_LAZY);
        if (m_lib == NULL) {
            m_lib = dlopen("libgennbck.so",
                           RTLD_LAZY);  // if used in subproject
            if (m_lib == NULL) {
                m_lib = dlopen(GENN_LIBRARY_PATH,
                               RTLD_LAZY);  // in LD_LIBRARY_PATH
                if (m_lib == NULL) {
                    throw std::runtime_error(
                        "Error loading GeNN backend: " +
                        std::string(dlerror()) +
                        "\nMake sure that "
                        "libgennbck lib is available either in this folder or "
                        "in LD_LIBRARY_PATH!");
                }
                global_logger().debug("cypress", "Using " GENN_LIBRARY_PATH);
            }
            else {
                global_logger().debug(
                    "cypress",
                    "Using libgennbck.so, might include LD_LIBRARY_PATH");
            }
        }
        else {
            global_logger().debug("cypress", "Using ./libgennbck.so");
        }
    };

    ~GENN_Lib() { dlclose(m_lib); }

public:
    GENN_Lib(GENN_Lib const &) = delete;
    void operator=(GENN_Lib const &) = delete;

    static GENN_Lib &instance()
    {
        static GENN_Lib instance;
        return instance;
    }

    Backend *create_genn_backend(Json &setup)
    {
        create_bs *mkr = (create_bs *)dlsym(m_lib, "make_genn_backend");
        return mkr(setup);
    }
};
}  // namespace cypress