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buffer.h

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00001 // Copyright (C) 1999-2003 Open Source Telecom Corporation.
00002 //  
00003 // This program is free software; you can redistribute it and/or modify
00004 // it under the terms of the GNU General Public License as published by
00005 // the Free Software Foundation; either version 2 of the License, or
00006 // (at your option) any later version.
00007 // 
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 // 
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the Free Software 
00015 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00016 // 
00017 // As a special exception to the GNU General Public License, permission is 
00018 // granted for additional uses of the text contained in its release 
00019 // of Common C++.
00020 // 
00021 // The exception is that, if you link the Common C++ library with other
00022 // files to produce an executable, this does not by itself cause the
00023 // resulting executable to be covered by the GNU General Public License.
00024 // Your use of that executable is in no way restricted on account of
00025 // linking the Common C++ library code into it.
00026 //
00027 // This exception does not however invalidate any other reasons why
00028 // the executable file might be covered by the GNU General Public License.
00029 // 
00030 // This exception applies only to the code released under the 
00031 // name Common C++.  If you copy code from other releases into a copy of
00032 // Common C++, as the General Public License permits, the exception does
00033 // not apply to the code that you add in this way.  To avoid misleading
00034 // anyone as to the status of such modified files, you must delete
00035 // this exception notice from them.
00036 // 
00037 // If you write modifications of your own for Common C++, it is your choice
00038 // whether to permit this exception to apply to your modifications.
00039 // If you do not wish that, delete this exception notice.
00040 
00046 #ifndef CCXX_BUFFER_H_
00047 #define CCXX_BUFFER_H_
00048 
00049 #ifndef CCXX_THREAD_H_
00050 #include <cc++/thread.h>
00051 #endif
00052 
00053 #ifdef  CCXX_NAMESPACES
00054 namespace ost {
00055 #endif
00056 
00078 #ifdef  WIN32
00079 class __EXPORT Buffer : public Mutex
00080 #else
00081 class __EXPORT Buffer : public Conditional
00082 #endif
00083 {
00084 private:
00085 #ifdef  WIN32
00086         HANDLE  sem_head, sem_tail;
00087 #endif
00088         size_t _size;
00089         size_t _used;
00090 
00091 protected:
00097         virtual int onPeek(void *buf) = 0;
00103         virtual int onWait(void *buf) = 0;
00109         virtual int onPost(void *buf) = 0;
00110 
00111 public:
00116         Buffer(size_t capacity);
00121         virtual ~Buffer();
00122 
00127         inline size_t getSize(void)
00128                 {return _size;};
00129 
00136         inline size_t getUsed(void)
00137                 {return _used;};
00138 
00148         int wait(void *buf, timeout_t timeout = 0);
00149 
00158         int post(void *buf, timeout_t timeout = 0);
00159 
00166         int peek(void *buf);
00167 
00172         virtual bool isValid(void)
00173                 {return true;};
00174 };
00175 
00183 class __EXPORT FixedBuffer : public Buffer
00184 {
00185 private:
00186         char *buf, *head, *tail;
00187         size_t objsize;
00188 
00189 protected:
00195         int onPeek(void *buf);
00196 
00202         int onWait(void *buf);
00203 
00209         int onPost(void *buf);
00210 
00211 public:
00219         FixedBuffer(size_t capacity, size_t objsize);
00220 
00227         FixedBuffer(const FixedBuffer &fb);
00228 
00232         virtual ~FixedBuffer();
00233 
00234         FixedBuffer &operator=(const FixedBuffer &fb);
00235 
00236         bool isValid(void);
00237 };
00238 
00252 class __EXPORT ThreadQueue : public Mutex, public Thread, public Semaphore
00253 {
00254 private:
00255         typedef struct _data
00256         {
00257                 struct _data *next;
00258                 unsigned len;
00259                 char data[1];
00260         }       data_t;
00261 
00262         bool started;
00263 
00264         data_t *first, *last;           // head/tail of list
00265 
00266         void run(void);                 // private run method
00267 
00268 protected:
00269         const char *name;               // used for save/restore file
00270 
00275         virtual void startQueue(void)
00276                 {return;};
00277 
00283         virtual void stopQueue(void)
00284                 {return;};
00285 
00294         virtual void runQueue(void *data) = 0;
00295 
00296 public:
00304         ThreadQueue(const char *id, int pri, size_t stack = 0);
00305 
00309         ~ThreadQueue();
00310 
00319         void post(const void *data, unsigned len);
00320 };
00321 
00322 
00324 inline int get(Buffer &b, void *o, timeout_t t = 0)
00325         {return b.wait(o, t);}
00326 
00328 inline int put(Buffer &b, void *o, timeout_t t = 0)
00329         {return b.post(o, t);}
00330 
00332 inline int peek(Buffer &b, void *o)
00333         {return b.peek(o);}
00334 
00335 
00336 #ifdef  CCXX_NAMESPACES
00337 }
00338 #endif
00339 
00340 #endif
00341 

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