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buffer.h

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00001 // Copyright (C) 1999-2005 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, you may use this file as part of a free software
00018 // library without restriction.  Specifically, if other files instantiate
00019 // templates or use macros or inline functions from this file, or you compile
00020 // this file and link it with other files to produce an executable, this
00021 // file does not by itself cause the resulting executable to be covered by
00022 // the GNU General Public License.  This exception does not however
00023 // invalidate any other reasons why the executable file might be covered by
00024 // the GNU General Public License.
00025 //
00026 // This exception applies only to the code released under the name GNU
00027 // Common C++.  If you copy code from other releases into a copy of GNU 
00028 // Common C++, as the General Public License permits, the exception does
00029 // not apply to the code that you add in this way.  To avoid misleading
00030 // anyone as to the status of such modified files, you must delete
00031 // this exception notice from them.
00032 //
00033 // If you write modifications of your own for GNU Common C++, it is your choice
00034 // whether to permit this exception to apply to your modifications.
00035 // If you do not wish that, delete this exception notice.
00036 //
00037 
00043 #ifndef CCXX_BUFFER_H_
00044 #define CCXX_BUFFER_H_
00045 
00046 #ifndef CCXX_THREAD_H_
00047 #include <cc++/thread.h>
00048 #endif
00049 
00050 #ifdef  CCXX_NAMESPACES
00051 namespace ost {
00052 #endif
00053 
00075 #ifdef  WIN32
00076 class __EXPORT Buffer : public Mutex
00077 #else
00078 class __EXPORT Buffer : public Conditional
00079 #endif
00080 {
00081 private:
00082 #ifdef  WIN32
00083         HANDLE  sem_head, sem_tail;
00084 #endif
00085         size_t _size;
00086         size_t _used;
00087 
00088 protected:
00094         virtual size_t onPeek(void *buf) = 0;
00095 
00101         virtual size_t onWait(void *buf) = 0;
00102 
00108         virtual size_t onPost(void *buf) = 0;
00109 
00110 public:
00115         static const size_t timeout;
00116 
00121         Buffer(size_t capacity);
00126         virtual ~Buffer();
00127 
00132         inline size_t getSize(void)
00133                 {return _size;};
00134 
00141         inline size_t getUsed(void)
00142                 {return _used;};
00143 
00153         size_t wait(void *buf, timeout_t timeout = 0);
00154 
00163         size_t post(void *buf, timeout_t timeout = 0);
00164 
00171         size_t peek(void *buf);
00172 
00177         virtual bool isValid(void);
00178 };
00179 
00187 class __EXPORT FixedBuffer : public Buffer
00188 {
00189 private:
00190         char *buf, *head, *tail;
00191         size_t objsize;
00192 
00193 protected:
00199         size_t onPeek(void *buf);
00200 
00206         size_t onWait(void *buf);
00207 
00213         size_t onPost(void *buf);
00214 
00215 public:
00223         FixedBuffer(size_t capacity, size_t objsize);
00224 
00231         FixedBuffer(const FixedBuffer &fb);
00232 
00236         virtual ~FixedBuffer();
00237 
00238         FixedBuffer &operator=(const FixedBuffer &fb);
00239 
00240         bool isValid(void);
00241 };
00242 
00256 class __EXPORT ThreadQueue : public Mutex, public Thread, public Semaphore
00257 {
00258 private:
00259         typedef struct _data
00260         {
00261                 struct _data *next;
00262                 unsigned len;
00263                 char data[1];
00264         }       data_t;
00265 
00266         bool started;
00267 
00268         data_t *first, *last;           // head/tail of list
00269 
00270         void run(void);                 // private run method
00271 
00272 protected:
00273         const char *name;               // used for save/restore file
00274 
00279         virtual void startQueue(void);
00280 
00286         virtual void stopQueue(void);
00287 
00296         virtual void runQueue(void *data) = 0;
00297 
00298 public:
00306         ThreadQueue(const char *id, int pri, size_t stack = 0);
00307 
00311         ~ThreadQueue();
00312 
00321         void post(const void *data, unsigned len);
00322 };
00323 
00324 
00326 inline size_t get(Buffer &b, void *o, timeout_t t = 0)
00327         {return b.wait(o, t);}
00328 
00330 inline size_t put(Buffer &b, void *o, timeout_t t = 0)
00331         {return b.post(o, t);}
00332 
00334 inline size_t peek(Buffer &b, void *o)
00335         {return b.peek(o);}
00336 
00337 
00338 #ifdef  CCXX_NAMESPACES
00339 }
00340 #endif
00341 
00342 #endif
00343 

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