151 lines
3.6 KiB
C#
Executable File
151 lines
3.6 KiB
C#
Executable File
/*
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* Copyright (c) 2018 Stanislav Denisov
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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using System;
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using System.Diagnostics;
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using System.Threading;
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namespace NetStack.Buffers {
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internal sealed partial class DefaultArrayPool<T> : ArrayPool<T> {
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private sealed class Bucket {
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internal readonly int _bufferLength;
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private readonly T[][] _buffers;
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#if NETSTACK_BUFFERS_LOG
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private readonly int _poolId;
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#endif
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#if NET_4_6 || NET_STANDARD_2_0
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private SpinLock _lock;
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#else
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private object _lock;
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#endif
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private int _index;
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internal Bucket(int bufferLength, int numberOfBuffers, int poolId) {
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#if NET_4_6 || NET_STANDARD_2_0
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_lock = new SpinLock();
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#else
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_lock = new Object();
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#endif
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_buffers = new T[numberOfBuffers][];
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_bufferLength = bufferLength;
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#if NETSTACK_BUFFERS_LOG
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_poolId = poolId;
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#endif
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}
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#if NET_4_6 || NET_STANDARD_2_0
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internal int Id => GetHashCode();
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#else
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internal int Id {
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get {
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return GetHashCode();
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}
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}
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#endif
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internal T[] Rent() {
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T[][] buffers = _buffers;
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T[] buffer = null;
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bool allocateBuffer = false;
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#if NET_4_6 || NET_STANDARD_2_0
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bool lockTaken = false;
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try {
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_lock.Enter(ref lockTaken);
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if (_index < buffers.Length) {
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buffer = buffers[_index];
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buffers[_index++] = null;
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allocateBuffer = buffer == null;
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}
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}
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finally {
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if (lockTaken)
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_lock.Exit(false);
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}
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#else
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try {
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Monitor.Enter(_lock);
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if (_index < buffers.Length) {
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buffer = buffers[_index];
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buffers[_index++] = null;
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allocateBuffer = buffer == null;
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}
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}
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finally {
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Monitor.Exit(_lock);
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}
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#endif
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if (allocateBuffer) {
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buffer = new T[_bufferLength];
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#if NETSTACK_BUFFERS_LOG
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var log = ArrayPoolEventSource.EventLog;
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log.BufferAllocated(buffer.GetHashCode(), _bufferLength, _poolId, Id, ArrayPoolEventSource.BufferAllocatedReason.Pooled);
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#endif
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}
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return buffer;
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}
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internal void Return(T[] array) {
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if (array.Length != _bufferLength)
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throw new ArgumentException("BufferNotFromPool", "array");
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#if NET_4_6 || NET_STANDARD_2_0
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bool lockTaken = false;
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try {
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_lock.Enter(ref lockTaken);
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if (_index != 0)
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_buffers[--_index] = array;
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}
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finally {
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if (lockTaken)
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_lock.Exit(false);
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}
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#else
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try {
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Monitor.Enter(_lock);
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if (_index != 0)
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_buffers[--_index] = array;
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}
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finally {
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Monitor.Exit(_lock);
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}
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#endif
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}
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}
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}
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} |