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Thread_POSIX.h

//
// Thread_POSIX.h
//
// $Id: //poco/1.3/Foundation/include/Poco/Thread_POSIX.h#5 $
//
// 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 "Poco/Foundation.h"
#include "Poco/Runnable.h"
#include "Poco/SignalHandler.h"
#include "Poco/Event.h"
#include "Poco/RefCountedObject.h"
#include "Poco/AutoPtr.h"
#include <pthread.h>
#if !defined(POCO_NO_SYS_SELECT_H)
#include <sys/select.h>
#endif
#include <errno.h>


namespace Poco {


class Foundation_API ThreadImpl
{
public:     
      typedef void (*Callable)(void*);

      enum Priority
      {
            PRIO_LOWEST_IMPL,
            PRIO_LOW_IMPL,
            PRIO_NORMAL_IMPL,
            PRIO_HIGH_IMPL,
            PRIO_HIGHEST_IMPL
      };

      struct CallbackData: public RefCountedObject
      {
            CallbackData(): callback(0), pData(0)
            {
            }

            Callable  callback;
            void*     pData; 
      };

      ThreadImpl();                       
      ~ThreadImpl();

      void setPriorityImpl(int prio);
      int getPriorityImpl() const;
      void setOSPriorityImpl(int prio);
      int getOSPriorityImpl() const;
      static int getMinOSPriorityImpl();
      static int getMaxOSPriorityImpl();
      void setStackSizeImpl(int size);
      int getStackSizeImpl() const;
      void startImpl(Runnable& target);
      void startImpl(Callable target, void* pData = 0);

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

protected:
      static void* runnableEntry(void* pThread);
      static void* callableEntry(void* pThread);
      static int mapPrio(int prio);
      static int reverseMapPrio(int osPrio);

private:
      struct ThreadData: public RefCountedObject
      {
            ThreadData():
                  pRunnableTarget(0),
                  pCallbackTarget(0),
                  thread(0),
                  prio(PRIO_NORMAL_IMPL),
                  done(false),
                  stackSize(POCO_THREAD_STACK_SIZE)
            {
            }

            Runnable*     pRunnableTarget;
            AutoPtr<CallbackData> pCallbackTarget;
            pthread_t     thread;
            int           prio;
            int           osPrio;
            Event         done;
            std::size_t   stackSize;
      };

      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 int ThreadImpl::getOSPriorityImpl() const
{
      return _pData->osPrio;
}


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 bool ThreadImpl::isRunningImpl() const
{
      return _pData->pRunnableTarget != 0 ||
            (_pData->pCallbackTarget.get() != 0 && _pData->pCallbackTarget->callback != 0);
}


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


inline int ThreadImpl::getStackSizeImpl() const
{
      return _pData->stackSize;
}


} // namespace Poco


#endif // Foundation_Thread_POSIX_INCLUDED

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