kradio4 r778
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00001 /*************************************************************************** 00002 ringbuffer.h - description 00003 ------------------- 00004 begin : Sun March 21 2004 00005 copyright : (C) 2004 by Martin Witte 00006 email : emw-kradio@nocabal.de 00007 ***************************************************************************/ 00008 00009 /*************************************************************************** 00010 * * 00011 * This program is free software; you can redistribute it and/or modify * 00012 * it under the terms of the GNU General Public License as published by * 00013 * the Free Software Foundation; either version 2 of the License, or * 00014 * (at your option) any later version. * 00015 * * 00016 ***************************************************************************/ 00017 00018 #ifndef _KRADIO_RING_BUFFER_H 00019 #define _KRADIO_RING_BUFFER_H 00020 00021 #ifdef HAVE_CONFIG_H 00022 #include <config.h> 00023 #endif 00024 00025 #include <sys/types.h> 00026 #include <kdemacros.h> 00027 #include <QtCore/QSemaphore> 00028 00029 class KDE_EXPORT RingBuffer 00030 { 00031 public: 00032 RingBuffer(size_t size, bool synchronized = false); 00033 ~RingBuffer(); 00034 00035 bool resize(size_t new_size); 00036 00037 size_t addData (const char *src, size_t size); 00038 size_t takeData(char *dst, size_t size, bool lock = true); 00039 00040 char *getFreeSpace(size_t &size); 00041 size_t removeFreeSpace(size_t size); 00042 00043 char *getData(size_t &size); 00044 size_t removeData(size_t size); 00045 00046 size_t getSize() const; 00047 size_t getFillSize() const; 00048 size_t getFreeSize() const; 00049 00050 void clear(); 00051 00052 void lockTransaction() const; 00053 void unlockTransaction() const; 00054 00055 protected: 00056 void lock() const; 00057 void unlock() const; 00058 00059 char *m_Buffer; 00060 size_t m_Start; 00061 size_t m_Size, 00062 m_FillSize; 00063 00064 bool m_synchronized; 00065 mutable QSemaphore m_synchronizer; 00066 mutable QSemaphore m_transactionSynchronizer; 00067 }; 00068 00069 #endif