thread.h

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// -*- mode: c++; tab-width: 4; indent-tabs-mode: t; c-file-style: "stroustrup"; -*-
// vi:set ts=4 sts=4 sw=4 noet :
// Copyright 2013, The TPIE development team
//
// This file is part of TPIE.
//
// TPIE is free software: you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// TPIE 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 Lesser General Public
// License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with TPIE.  If not, see <http://www.gnu.org/licenses/>

#ifndef TPIE_COMPRESSED_THREAD_H
#define TPIE_COMPRESSED_THREAD_H


#include <thread>
#include <mutex>
#include <memory>
#include <tpie/array.h>
#include <tpie/file_accessor/file_accessor.h>
#include <tpie/file_accessor/byte_stream_accessor.h>
#include <tpie/compressed/predeclare.h>
#include <tpie/compressed/scheme.h>

namespace tpie {

class compressor_thread {
    class impl;
    impl * pimpl;

public:
    typedef std::shared_ptr<compressor_buffer> buffer_t;
    typedef file_accessor::byte_stream_accessor<default_raw_file_accessor> file_accessor_t;
    typedef std::mutex mutex_t;

    static stream_size_type subtract_block_header(stream_size_type dataOffset);

    compressor_thread();
    ~compressor_thread();

    mutex_t & mutex();

    // Locking: Caller must lock the thread (with a compressor_thread_lock).
    void request(compressor_request & r);

    void wait_for_request_done(compressor_thread_lock & l);

    void run();

    void stop(compressor_thread_lock & lock);

    void set_preferred_compression(compressor_thread_lock &, compression_scheme::type);
};

class compressor_thread_lock {
public:
    typedef std::unique_lock<compressor_thread::mutex_t> lock_t;

    compressor_thread_lock(compressor_thread & c)
        : t1(ptime::now())
        , m_lock(c.mutex())
        , t2(ptime::now())
    {
    }

    ~compressor_thread_lock() {
        ptime t3 = ptime::now();
        // Time blocked
        increment_user(0, (stream_size_type)(ptime::seconds(t1, t2)*1000000));
        // Time held
        increment_user(1, (stream_size_type)(ptime::seconds(t2, t3)*1000000));
    }

    lock_t & get_lock() {
        return m_lock;
    }

private:
    ptime t1;
    lock_t m_lock;
    ptime t2;
};

} // namespace tpie

#endif // TPIE_COMPRESSED_THREAD_H