mirror of
https://github.com/brmlab/kalibrate-rtl.git
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c58471bb42
taken from: http://thre.at/kalibrate/kal-v0.4.1.tar.bz2 Signed-off-by: Steve Markgraf <steve@steve-m.de>
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
/*
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* Copyright (c) 2010, Joshua Lackey
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* circular_buffer
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*
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* This class is based heavily on the GNU Radio circular buffer. While this
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* class was written from scratch and contains ideas not present in the GNU
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* Radio implementation, the GNU Radio circular buffers were used as a
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* reference while developing this class.
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*
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* This is more a warning that the above BSD-style license may not be the only
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* copyright that applies.
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*/
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#pragma once
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/*
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* XXX If read doesn't catch up with write before 2**64 bytes are written, this
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* will break.
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*/
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#include <pthread.h>
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class circular_buffer {
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public:
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circular_buffer(const unsigned int buf_len, const unsigned int item_size = 1, const unsigned int overwrite = 0);
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~circular_buffer();
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unsigned int read(void *buf, const unsigned int buf_len);
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void *peek(unsigned int *buf_len);
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unsigned int purge(const unsigned int buf_len);
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void *poke(unsigned int *buf_len);
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void wrote(unsigned int len);
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unsigned int write(const void *buf, const unsigned int buf_len);
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unsigned int data_available();
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unsigned int space_available();
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void flush();
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void flush_nolock();
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void lock();
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void unlock();
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unsigned int buf_len();
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private:
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void *m_buf;
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unsigned int m_buf_len, m_buf_size, m_r, m_w, m_item_size;
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unsigned long long m_read, m_written;
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unsigned int m_overwrite;
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void *m_base;
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unsigned int m_pagesize;
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pthread_mutex_t m_mutex;
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};
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