Thread_POSIX.h

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/* ES40 emulator.
 * Copyright (C) 2007-2008 by the ES40 Emulator Project
 *
 * WWW    : http://sourceforge.net/projects/es40
 * E-mail : camiel@camicom.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.
 * 
 * Although this is not required, the author would appreciate being notified of, 
 * and receiving any modifications you may make to the source code that might serve
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 */

//
// Thread_POSIX.h
//
// $Id: Thread_POSIX.h,v 1.1 2008/03/31 19:13:34 iamcamiel Exp $
//
// Library: Foundation
// Package: Threading
// Module:  Thread
//
// Definition of the ThreadImpl class for POSIX Threads.
//
// Copyright (c) 2004-2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef Foundation_Thread_POSIX_INCLUDED
#define Foundation_Thread_POSIX_INCLUDED


#include "VMS/Foundation.h"
#include "VMS/Runnable.h"
#include "VMS/Event.h"
#include "VMS/RefCountedObject.h"
#include "VMS/AutoPtr.h"
#include <pthread.h>
#include <errno.h>


namespace Poco {


class Foundation_API ThreadImpl
{
public: 
        enum Priority
        {
                PRIO_LOWEST_IMPL,
                PRIO_LOW_IMPL,
                PRIO_NORMAL_IMPL,
                PRIO_HIGH_IMPL,
                PRIO_HIGHEST_IMPL
        };

        ThreadImpl();                           
        ~ThreadImpl();

        Runnable& targetImpl() const;
        void setPriorityImpl(int prio);
        int getPriorityImpl() const;
        void startImpl(Runnable& target);

        void joinImpl();
        bool joinImpl(long milliseconds);
        bool isRunningImpl() const;
        static void sleepImpl(long milliseconds);
        static void yieldImpl();
        static ThreadImpl* currentImpl();

protected:
        static void* entry(void* pThread);
        static int mapPrio(int prio);

private:
        struct ThreadData: public RefCountedObject
        {
                ThreadData():
                        pTarget(0),
                        thread(0),
                        prio(PRIO_NORMAL_IMPL),
                        done(false)
                {
                }

                Runnable* pTarget;
                pthread_t thread;
                int       prio;
                Event     done;
        };
        
        AutoPtr<ThreadData> _pData;
        
        static pthread_key_t _currentKey;
        static bool          _haveCurrentKey;
        
#if defined(POCO_OS_FAMILY_UNIX)
        SignalHandler::JumpBufferVec _jumpBufferVec;
        friend class SignalHandler;
#endif
};


//
// inlines
//
inline int ThreadImpl::getPriorityImpl() const
{
        return _pData->prio;
}


inline void ThreadImpl::sleepImpl(long milliseconds)
{
#if defined(__VMS) || defined(__digital__)
                // This is specific to DECThreads
                struct timespec interval;
                interval.tv_sec  = milliseconds / 1000;
                interval.tv_nsec = (milliseconds % 1000)*1000000; 
                pthread_delay_np(&interval);
#else 
                struct timeval tv;
                tv.tv_sec  = milliseconds / 1000;
                tv.tv_usec = (milliseconds % 1000) * 1000;
                select(0, NULL, NULL, NULL, &tv);       
#endif
}


inline void ThreadImpl::yieldImpl()
{
        sched_yield();
}


} // namespace Poco


#endif // Foundation_Thread_POSIX_INCLUDED

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