Thread_POSIX.cpp

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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
 * the general public.
 */

//
// Thread_POSIX.cpp
//
// $Id: Thread_POSIX.cpp,v 1.1 2008/03/31 19:13:34 iamcamiel Exp $
//
// Library: Foundation
// Package: Threading
// Module:  Thread
//
// 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.
//


#include "VMS/Thread_POSIX.h"
#include "VMS/Exception.h"
#include "VMS/ErrorHandler.h"
#include <signal.h>


//
// Block SIGPIPE in main thread.
//
#if defined(POCO_OS_FAMILY_UNIX)
namespace
{
        class SignalBlocker
        {
        public:
                SignalBlocker()
                {
                        sigset_t sset;
                        sigemptyset(&sset);
                        sigaddset(&sset, SIGPIPE); 
                        pthread_sigmask(SIG_BLOCK, &sset, 0);
                }
                ~SignalBlocker()
                {
                }
        };
        
        static SignalBlocker signalBlocker;
}
#endif


namespace Poco {


pthread_key_t ThreadImpl::_currentKey;
bool ThreadImpl::_haveCurrentKey = false;


ThreadImpl::ThreadImpl():
        _pData(new ThreadData)
{
        if (!_haveCurrentKey)
        {
                if (pthread_key_create(&_currentKey, NULL))
                        throw SystemException("cannot allocate thread context key");
                _haveCurrentKey = true;
        }
}

                        
ThreadImpl::~ThreadImpl()
{
        if (_pData->pTarget)
                pthread_detach(_pData->thread);
}


void ThreadImpl::setPriorityImpl(int prio)
{
        if (prio != _pData->prio)
        {
                _pData->prio = prio;
                if (_pData->pTarget)
                {
                        struct sched_param par;
                        par.sched_priority = mapPrio(_pData->prio);
                        if (pthread_setschedparam(_pData->thread, SCHED_OTHER, &par))
                                throw SystemException("cannot set thread priority");
                }
        }
}


void ThreadImpl::startImpl(Runnable& target)
{
        if (_pData->pTarget) throw SystemException("thread already running");

        _pData->pTarget = &target;
        if (pthread_create(&_pData->thread, NULL, entry, this))
        {
                _pData->pTarget = 0;
                throw SystemException("cannot start thread");
        }

        if (_pData->prio != PRIO_NORMAL_IMPL)
        {
                struct sched_param par;
                par.sched_priority = mapPrio(_pData->prio);
                if (pthread_setschedparam(_pData->thread, SCHED_OTHER, &par))
                        throw SystemException("cannot set thread priority");
        }
}


void ThreadImpl::joinImpl()
{
        _pData->done.wait();
        void* result;
        if (pthread_join(_pData->thread, &result))
                throw SystemException("cannot join thread"); 
}


bool ThreadImpl::joinImpl(long milliseconds)
{
        if (_pData->done.tryWait(milliseconds))
        {
                void* result;
                if (pthread_join(_pData->thread, &result))
                        throw SystemException("cannot join thread");
                return true;
        }
        else return false;
}


bool ThreadImpl::isRunningImpl() const
{
        return _pData->pTarget != 0;
}


ThreadImpl* ThreadImpl::currentImpl()
{
        if (_haveCurrentKey)
                return reinterpret_cast<ThreadImpl*>(pthread_getspecific(_currentKey));
        else
                return 0;
}


void* ThreadImpl::entry(void* pThread)
{
        pthread_setspecific(_currentKey, pThread);

#if defined(POCO_OS_FAMILY_UNIX)
        sigset_t sset;
        sigemptyset(&sset);
        sigaddset(&sset, SIGQUIT);
        sigaddset(&sset, SIGTERM);
        sigaddset(&sset, SIGPIPE); 
        pthread_sigmask(SIG_BLOCK, &sset, 0);
#endif

        ThreadImpl* pThreadImpl = reinterpret_cast<ThreadImpl*>(pThread);
        AutoPtr<ThreadData> pData = pThreadImpl->_pData;
        try
        {
                pData->pTarget->run();
        }
        catch (Exception& exc)
        {
                ErrorHandler::handle(exc);
        }
        catch (std::exception& exc)
        {
                ErrorHandler::handle(exc);
        }
        catch (...)
        {
                ErrorHandler::handle();
        }
        pData->pTarget = 0;
        pData->done.set();
        return 0;
}


int ThreadImpl::mapPrio(int prio)
{
#if defined(__VMS) || defined(__digital__)
        static const int pmin = PRI_OTHER_MIN;
        static const int pmax = PRI_OTHER_MAX;
#else
        static const int pmin = sched_get_priority_min(SCHED_OTHER);
        static const int pmax = sched_get_priority_max(SCHED_OTHER);
#endif

        switch (prio)
        {
        case PRIO_LOWEST_IMPL:
                return pmin;
        case PRIO_LOW_IMPL:
                return pmin + (pmax - pmin)/4;
        case PRIO_NORMAL_IMPL:
                return pmin + (pmax - pmin)/2;
        case PRIO_HIGH_IMPL:
                return pmin + 3*(pmax - pmin)/4;
        case PRIO_HIGHEST_IMPL:
                return pmax;
        default:
                poco_bugcheck_msg("invalid thread priority");
        }
        return -1; // just to satisfy compiler - we'll never get here anyway
}


} // namespace Poco

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