Thread.h

/*
 * Copyright (C) 2006-2013 Marc Boris Duerner
 * 
 * This library 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 2.1 of the License, or (at your option) any later version.
 * 
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 * 
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef PT_SYSTEM_THREAD_H
#define PT_SYSTEM_THREAD_H

#include <Pt/System/Api.h>
#include <Pt/NonCopyable.h>
#include <Pt/Callable.h>
#include <Pt/Function.h>
#include <Pt/Method.h>

namespace Pt {

namespace System {

class EventLoop;

class PT_SYSTEM_API Thread : protected NonCopyable
{
    public:
        enum State
        {
            Ready    = 0, 
            Running  = 1, 
            Joined   = 2, 
            Detached = 3  
        };

    public:
        Thread();

        explicit Thread(const Callable<void>& cb);

        explicit Thread(EventLoop& loop);

        void init(const Callable<void>& cb);

        virtual ~Thread();

        State state() const
        { return _state; }

        bool isJoinable() const
        { return _state == Running; }

        void start();

        void detach();

        void join();

        static void exit();

        static void yield();

        static void sleep(unsigned int ms);

    protected:
        bool joinNoThrow();

    private:
        Thread::State _state;

        bool _detach;

        class ThreadImpl* _impl;
};

class AttachedThread : public Thread
{
    public:
        AttachedThread()
        : Thread()
        {}

        explicit AttachedThread(const Callable<void>& cb)
        : Thread(cb)
        {}

        explicit AttachedThread(EventLoop& loop)
        : Thread(loop)
        {}

        ~AttachedThread()
        {
            Thread::joinNoThrow();
        }
};


class DetachedThread : public Thread
{
    typedef void (*FuncPtrT)();

    public:
        explicit DetachedThread(FuncPtrT fp)
        : Thread( callable(fp) )
        {
            Thread::detach();
        }

    protected:
        DetachedThread()
        : Thread()
        {
            Thread::init( callable(*this, &DetachedThread::exec) );
            Thread::detach();
        }

        virtual void destroy()
        { delete this; }

        virtual void run()
        {}

    private:
        void exec()
        {
            this->run();
            this->destroy();
        }
};

} // namespace System

} // namespace Pt

#endif // PT_SYSTEM_THREAD_H