80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
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#pragma once
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#ifdef __cplusplus
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}
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#endif
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#include "new.h"
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#include "ArchThreads.h"
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#include "assert.h"
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template<class T>
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class RingBuffer
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{
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public:
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RingBuffer ( uint32 size=128 );
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~RingBuffer();
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bool get ( T &c );
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void put ( T c );
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void clear();
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private:
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size_t buffer_size_;
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T *buffer_;
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size_t write_pos_;
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size_t read_pos_;
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};
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template <class T>
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RingBuffer<T>::RingBuffer ( uint32 size )
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{
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assert ( size>1 );
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buffer_size_=size;
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buffer_=new T[buffer_size_];
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write_pos_=1;
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read_pos_=0;
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}
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template <class T>
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RingBuffer<T>::~RingBuffer()
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{
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delete[] buffer_;
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}
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template <class T>
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void RingBuffer<T>::put ( T c )
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{
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size_t old_write_pos=write_pos_;
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if ( old_write_pos == read_pos_ )
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return;
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buffer_[old_write_pos]=c;
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ArchThreads::testSetLock ( write_pos_, ( old_write_pos + 1 ) % buffer_size_ );
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}
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template <class T>
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void RingBuffer<T>::clear()
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{
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ArchThreads::testSetLock ( write_pos_,1 );
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// assumed that there is only one reader who can't have called clear and get at the same time.
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// here get would return garbage.
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ArchThreads::testSetLock ( read_pos_,0 );
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}
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template <class T>
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bool RingBuffer<T>::get ( T &c )
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{
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uint32 new_read_pos = ( read_pos_ + 1 ) % buffer_size_;
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if ( write_pos_ == new_read_pos ) //nothing new to read
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return false;
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c = buffer_[new_read_pos];
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ArchThreads::testSetLock ( read_pos_,new_read_pos );
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return true;
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}
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