buffer.h

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// Copyright (C) 1999-2003 Open Source Telecom Corporation.
//  
// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// 
// As a special exception to the GNU General Public License, permission is 
// granted for additional uses of the text contained in its release 
// of Common C++.
// 
// The exception is that, if you link the Common C++ library with other
// files to produce an executable, this does not by itself cause the
// resulting executable to be covered by the GNU General Public License.
// Your use of that executable is in no way restricted on account of
// linking the Common C++ library code into it.
//
// This exception does not however invalidate any other reasons why
// the executable file might be covered by the GNU General Public License.
// 
// This exception applies only to the code released under the 
// name Common C++.  If you copy code from other releases into a copy of
// Common C++, as the General Public License permits, the exception does
// not apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
// 
// If you write modifications of your own for Common C++, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.

#ifndef CCXX_BUFFER_H_
#define CCXX_BUFFER_H_

#ifndef CCXX_THREAD_H_
#include <cc++/thread.h>
#endif

#ifdef  CCXX_NAMESPACES
namespace ost {
#endif

#ifdef  WIN32
class __EXPORT Buffer : public Mutex
#else
class __EXPORT Buffer : public Conditional
#endif
{
private:
#ifdef  WIN32
        HANDLE  sem_head, sem_tail;
#endif
        size_t _size;
        size_t _used;

protected:
        virtual int onPeek(void *buf) = 0;
        virtual int onWait(void *buf) = 0;
        virtual int onPost(void *buf) = 0;

public:
        Buffer(size_t capacity);
        virtual ~Buffer();

        inline size_t getSize(void)
                {return _size;};

        inline size_t getUsed(void)
                {return _used;};

        int wait(void *buf, timeout_t timeout = 0);

        int post(void *buf, timeout_t timeout = 0);

        int peek(void *buf);

        virtual bool isValid(void)
                {return true;};
};

class __EXPORT FixedBuffer : public Buffer
{
private:
        char *buf, *head, *tail;
        size_t objsize;

protected:
        int onPeek(void *buf);

        int onWait(void *buf);

        int onPost(void *buf);

public:
        FixedBuffer(size_t capacity, size_t objsize);

        FixedBuffer(const FixedBuffer &fb);

        virtual ~FixedBuffer();

        FixedBuffer &operator=(const FixedBuffer &fb);

        bool isValid(void);
};

class ThreadQueue : public Mutex, public Thread, public Semaphore
{
private:
        typedef struct _data
        {
                struct _data *next;
                unsigned len;
                char data[1];
        }       data_t;

        bool started;

        data_t *first, *last;           // head/tail of list

        void run(void);                 // private run method

protected:
        const char *name;               // used for save/restore file

        virtual void startQueue(void)
                {return;};

        virtual void stopQueue(void)
                {return;};

        virtual void runQueue(void *data) = 0;

public:
        ThreadQueue(const char *id, int pri, size_t stack = 0);

        ~ThreadQueue();

        void post(const void *data, unsigned len);
};


inline int get(Buffer &b, void *o, timeout_t t = 0)
        {return b.wait(o, t);};

inline int put(Buffer &b, void *o, timeout_t t = 0)
        {return b.post(o, t);};

inline int peek(Buffer &b, void *o)
        {return b.peek(o);};


#ifdef  CCXX_NAMESPACES
};
#endif

#endif

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