73 lines
1.8 KiB
C#
73 lines
1.8 KiB
C#
using System.Threading;
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public class RingBuffer<T>
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{
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private readonly T[] buffer;
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private readonly int capacity;
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private int writePos;
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private int readPos;
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private int count;
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public RingBuffer(int capacity)
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{
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this.capacity = capacity;
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this.buffer = new T[capacity];
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this.writePos = 0;
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this.readPos = 0;
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this.count = 0;
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}
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public void Write(T item)
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{
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int localWritePos;
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int localReadPos;
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do
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{
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localWritePos = Volatile.Read(ref writePos);
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localReadPos = Volatile.Read(ref readPos);
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int nextWritePos = (localWritePos + 1) % capacity;
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if (nextWritePos == localReadPos)
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{
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// 缓冲区已满，覆盖最旧的未读数据
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Interlocked.CompareExchange(ref readPos, (localReadPos + 1) % capacity, localReadPos);
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}
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}
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while (Interlocked.CompareExchange(ref writePos, (localWritePos + 1) % capacity, localWritePos) != localWritePos);
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buffer[localWritePos] = item;
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Interlocked.Increment(ref count);
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}
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public bool TryRead(out T item)
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{
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item = default(T);
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int localReadPos;
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int localWritePos;
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do
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{
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localReadPos = Volatile.Read(ref readPos);
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localWritePos = Volatile.Read(ref writePos);
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if (localReadPos == localWritePos)
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{
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return false; // 缓冲区为空
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}
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}
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while (Interlocked.CompareExchange(ref readPos, (localReadPos + 1) % capacity, localReadPos) != localReadPos);
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item = buffer[localReadPos];
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Interlocked.Decrement(ref count);
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return true;
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}
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public int Available()
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{
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return Volatile.Read(ref count);
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}
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}
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