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74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
// rdringbuffer.h
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//
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// A lock-free ring buffer.
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//
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// (C) Copyright 2000 Paul Davis
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// (C) Copyright 2003 Rohan Drape
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// (C) Copyright 2002 Fred Gleason <fredg@paravelsystems.com>
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//
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// $Id: rdringbuffer.h,v 1.5 2010/07/29 19:32:33 cvs Exp $
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Library General Public License
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// version 2 as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public
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// License along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// Adapted from code by Paul Davis and Rohan Drape in
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// 'example-clients/ringbuffer.ch' in the Jack Audio Connection Kit.
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//
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#ifndef RDRINGBUFFER_H
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#define RDRINGBUFFER_H
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#include <sys/types.h>
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typedef struct
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{
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char *buf;
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size_t len;
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}
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ringbuffer_data_t ;
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typedef struct
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{
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char *buf;
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volatile size_t write_ptr;
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volatile size_t read_ptr;
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size_t size;
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size_t size_mask;
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int mlocked;
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}
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ringbuffer_t ;
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class RDRingBuffer
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{
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public:
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RDRingBuffer(int sz);
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~RDRingBuffer();
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bool mlock();
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void reset();
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void writeAdvance(size_t cnt);
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void readAdvance(size_t cnt);
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size_t writeSpace() const;
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size_t readSpace() const;
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size_t read(char *dest,size_t cnt);
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size_t write(char *src,size_t cnt);
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void getReadVector(ringbuffer_data_t *vec);
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void getWriteVector(ringbuffer_data_t *vec);
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private:
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ringbuffer_t *rb;
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};
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#endif // RDRINGBUFFER_H
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