389ab0c8d0
... so there is only one update per track of the atomics in RingBuffer in each pass of the loop in FillBuffers, which will be needed to synchronize RingBuffer and TimeQueue correctly.
62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
/**********************************************************************
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Audacity: A Digital Audio Editor
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RingBuffer.h
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Dominic Mazzoni
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*******************************************************************/
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#ifndef __AUDACITY_RING_BUFFER__
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#define __AUDACITY_RING_BUFFER__
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#include "SampleFormat.h"
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#include <atomic>
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class RingBuffer {
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public:
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RingBuffer(sampleFormat format, size_t size);
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~RingBuffer();
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//
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// For the writer only:
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//
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size_t AvailForPut();
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size_t Put(samplePtr buffer, sampleFormat format, size_t samples,
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// optional number of trailing zeroes
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size_t padding = 0);
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size_t Clear(sampleFormat format, size_t samples);
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//
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// For the reader only:
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//
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size_t AvailForGet();
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size_t Get(samplePtr buffer, sampleFormat format, size_t samples);
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size_t Discard(size_t samples);
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private:
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size_t Filled( size_t start, size_t end );
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size_t Free( size_t start, size_t end );
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enum : size_t { CacheLine = 64 };
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/*
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// We will do this in C++17 instead:
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static constexpr size_t CacheLine =
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std::hardware_destructive_interference_size;
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*/
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// Align the two atomics to avoid false sharing
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alignas(CacheLine) std::atomic<size_t> mStart { 0 };
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alignas(CacheLine) std::atomic<size_t> mEnd{ 0 };
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const size_t mBufferSize;
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sampleFormat mFormat;
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SampleBuffer mBuffer;
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};
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#endif /* __AUDACITY_RING_BUFFER__ */
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