public T[] RentBuffer(int size, bool clearBuffer = false)
{
T[] buffer;
if (size > _maxBufferSize)
{
buffer = new T[size];
}
else
{
int index = BufferUtilities.SelectBucketIndex(size);
ManagedBufferBucket <T> bucket = Volatile.Read(ref _buckets[index]);
if (bucket == null)
{
Interlocked.CompareExchange(ref _buckets[index], new ManagedBufferBucket <T>(BufferUtilities.GetMaxSizeForBucket(index), NUMBER_OF_BUFFERS_IN_BUCKET), null);
bucket = _buckets[index];
}
buffer = bucket.Rent();
if (clearBuffer)
{
Array.Clear(buffer, 0, buffer.Length);
}
}
return(buffer);
}
// 2MB taken as the default since the average HTTP page is 1.9MB
// per http://httparchive.org/interesting.php, as of October 2015
public ManagedBufferPool(int maxBufferSizeInBytes = 2048000)
{
int maxBuckets = BufferUtilities.SelectBucketIndex(maxBufferSizeInBytes);
_maxBufferSize = maxBufferSizeInBytes;
_buckets = new ManagedBufferBucket <T> [maxBuckets + 1];
}
public NativeBufferPool(int maxElementsInBuffer)
{
int maxBuckets = BufferUtilities.SelectBucketIndex(maxElementsInBuffer);
_maxElements = maxElementsInBuffer;
_buckets = new NativeBufferBucket <T> [maxBuckets + 1];
}
public void ReturnBuffer(ref T[] buffer, bool clearBuffer = false)
{
if (clearBuffer)
{
Array.Clear(buffer, 0, buffer.Length);
}
if (buffer.Length > _maxBufferSize)
{
buffer = null;
}
else
{
_buckets[BufferUtilities.SelectBucketIndex(buffer.Length)].Return(ref buffer);
}
}
public Span <byte> Rent(int numberOfElements, bool clearBuffer = false)
{
if (_disposed)
{
throw new ObjectDisposedException("NativeBufferPool");
}
Span <byte> buffer;
if (numberOfElements > _maxElements)
{
#if DEBUG
System.Diagnostics.Debugger.Break();
#endif
buffer = new Span <byte>(Marshal.AllocHGlobal(numberOfElements * Marshal.SizeOf(typeof(byte))).ToPointer(), numberOfElements);
}
else
{
int index = BufferUtilities.SelectBucketIndex(numberOfElements);
NativeBufferBucket bucket = Volatile.Read(ref _buckets[index]);
if (bucket == null)
{
NativeBufferBucket newBucket = new NativeBufferBucket(BufferUtilities.GetMaxSizeForBucket(index), NUMBER_OF_BUFFERS_IN_BUCKET);
if (Interlocked.CompareExchange(ref _buckets[index], newBucket, null) != null)
{
newBucket.Dispose();
}
bucket = _buckets[index];
}
var rented = bucket.Rent();
buffer = new Span <byte>(rented._memory, rented._length);
}
if (clearBuffer)
{
BufferUtilities.ClearSpan(buffer);
}
return(buffer);
}
public void Return(Span <byte> buffer, bool clearBuffer = false)
{
if (_disposed)
{
throw new ObjectDisposedException("NativeBufferPool");
}
if (clearBuffer)
{
BufferUtilities.ClearSpan(buffer);
}
if (buffer.Length > _maxElements)
{
Marshal.FreeHGlobal(new IntPtr(buffer.UnsafePointer));
}
else
{
_buckets[BufferUtilities.SelectBucketIndex(buffer.Length)].Return(new NativeBuffer(buffer.UnsafePointer, 0));
}
}