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# IOStreamBufferQueue

```
struct IOStreamBufferQueue;
```

## Topics

### Accessing queue contents

[`uint32_t entryCount;`](/documentation/VideoDriverKit/IOStreamBufferQueue/entryCount)

[`volatile uint32_t headIndex;`](/documentation/VideoDriverKit/IOStreamBufferQueue/headIndex)

[`volatile uint32_t tailIndex;`](/documentation/VideoDriverKit/IOStreamBufferQueue/tailIndex)

[`IOStreamBufferQueueEntry queue[0];`](/documentation/VideoDriverKit/IOStreamBufferQueue/queue)

[`struct IOStreamBufferQueueEntry;`](/documentation/VideoDriverKit/IOStreamBufferQueueEntry)

### Accessing reserved properties

Don’t use these properties, which VideoDriverKit reserves for its own use.

[`uint32_t reserved;`](/documentation/VideoDriverKit/IOStreamBufferQueue/reserved)


---

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