TPCircularBuffer.h

// original source from Michael Tyson
//
// modified by adding additional functions to produce and consume without checking for buffer underflow
// for delay lines
// tz 11/2011

//
//  TPCircularBuffer.h
//  Circular buffer implementation
//
//  Created by Michael Tyson on 19/03/2011.
//  Copyright 2011 A Tasty Pixel. All rights reserved.
//

#include <libkern/OSAtomic.h>

typedef struct { 
    int32_t head;
    int32_t tail;
    volatile int32_t fillCount;
    int32_t length;
} TPCircularBufferRecord;

void TPCircularBufferInit(TPCircularBufferRecord *record, int length);
void TPCircularBufferClear(TPCircularBufferRecord *record);

int  TPCircularBufferFillCount(TPCircularBufferRecord *record);
int  TPCircularBufferFillCountContiguous(TPCircularBufferRecord *record);
int  TPCircularBufferSpace(TPCircularBufferRecord *record);
int  TPCircularBufferSpaceContiguous(TPCircularBufferRecord *record);

// Reading (consuming)
int  TPCircularBufferTail(TPCircularBufferRecord *record);
void TPCircularBufferConsume(TPCircularBufferRecord *record, int amount);
void TPCircularBufferConsumeSingleThread(TPCircularBufferRecord *record, int amount);

// Writing (producing)
int  TPCircularBufferHead(TPCircularBufferRecord *record);
void TPCircularBufferProduce(TPCircularBufferRecord *record, int amount);
void TPCircularBufferProduceSingleThread(TPCircularBufferRecord *record, int amount);
int  TPCircularBufferProduceBytes(TPCircularBufferRecord *record, void* dst, const void* src, int count, int len);

// tz for resetting tail

void TPCircularBufferSetTail(TPCircularBufferRecord *record, int32_t position, int32_t count);

int TPCircularBufferLength(TPCircularBufferRecord *record );
void TPCircularBufferProduceAnywhere(TPCircularBufferRecord *record, int amount);
void TPCircularBufferConsumeAnywhere(TPCircularBufferRecord *record, int amount);
void TPCircularBufferSetTailAnywhere(TPCircularBufferRecord *record, int32_t position );