s3fs-fuse/src/sighandlers.h

/*
 * s3fs - FUSE-based file system backed by Amazon S3
 *
 * Copyright(C) 2007 Randy Rizun <rrizun@gmail.com>
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#ifndef S3FS_SIGHANDLERS_H_
#define S3FS_SIGHANDLERS_H_

#include <memory>
#include <thread>

class Semaphore;

//----------------------------------------------
// class S3fsSignals
//----------------------------------------------
class S3fsSignals
{
    private:
        static std::unique_ptr<S3fsSignals> pSingleton;
        static bool         enableUsr1;

        std::unique_ptr<std::thread> pThreadUsr1;
        std::unique_ptr<Semaphore> pSemUsr1;

    protected:
        static S3fsSignals* get() { return pSingleton.get(); }

        static void HandlerUSR1(int sig);
        static void CheckCacheWorker(Semaphore* pSem);

        static void HandlerUSR2(int sig);
        static bool InitUsr2Handler();

        static void HandlerHUP(int sig);
        static bool InitHupHandler();

        S3fsSignals();

        bool InitUsr1Handler();
        bool DestroyUsr1Handler();
        bool WakeupUsr1Thread();

    public:
        ~S3fsSignals();
        S3fsSignals(const S3fsSignals&) = delete;
        S3fsSignals(S3fsSignals&&) = delete;
        S3fsSignals& operator=(const S3fsSignals&) = delete;
        S3fsSignals& operator=(S3fsSignals&&) = delete;

        static bool Initialize();
        static bool Destroy();

        static bool SetUsr1Handler(const char* path);
};

#endif // S3FS_SIGHANDLERS_H_

/*
* Local variables:
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* End:
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*/