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using System;
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using System.Threading;
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using System.Threading.Tasks;
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namespace PCL.Core.Utils.Threading;
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// Partly generated by o4-mini-high (20250709)
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/// <summary>
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/// 使用两个线程池的调度器,分为 CPU 线程池和 IO 线程池,分别负责 CPU 密集型任务和 IO 密集型任务
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/// </summary>
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public class DualThreadPool
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{
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/// <summary>
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/// 两线程池分别计算的最大线程数
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/// </summary>
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public int MaxThread { get; }
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private readonly TaskFactory _ioFactory;
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private readonly TaskFactory _cpuFactory;
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private readonly CancellationTokenSource _cts = new();
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/// <summary>
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/// 初始化 <see cref="DualThreadPool"/> 实例
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/// </summary>
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/// <param name="maxThread">参考 <see cref="MaxThread"/>,最小为 1</param>
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/// <exception cref="ArgumentOutOfRangeException">最大线程数小于 1</exception>
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public DualThreadPool(int maxThread)
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{
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if (maxThread < 1) throw new ArgumentOutOfRangeException(nameof(maxThread));
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MaxThread = maxThread;
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var ioScheduler = new LimitedConcurrencyLevelTaskScheduler(maxThread);
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var cpuScheduler = new LimitedConcurrencyLevelTaskScheduler(maxThread);
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var cancellationToken = _cts.Token;
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// DenyChildAttach 防止子任务跑到外层 scheduler
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_ioFactory = new TaskFactory(
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cancellationToken,
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TaskCreationOptions.DenyChildAttach,
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TaskContinuationOptions.None,
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ioScheduler);
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_cpuFactory = new TaskFactory(
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cancellationToken,
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TaskCreationOptions.DenyChildAttach,
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TaskContinuationOptions.None,
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cpuScheduler);
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}
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/// <summary>
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/// 提交一段 IO 密集工作
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/// </summary>
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public Task QueueIo(Action work) => _ioFactory.StartNew(work);
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/// <summary>
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/// 提交一段异步 IO 密集工作
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/// </summary>
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public Task QueueIo(Func<Task> work) => _ioFactory.StartNew(work).Unwrap();
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/// <summary>
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/// 提交一段 CPU 密集工作
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/// </summary>
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public Task QueueCpu(Action work) => _cpuFactory.StartNew(work);
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/// <summary>
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/// 提交一段异步 CPU 密集工作
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/// </summary>
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public Task QueueCpu(Func<Task> work) => _cpuFactory.StartNew(work).Unwrap();
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/// <summary>
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/// 取消所有正在执行的工作
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/// </summary>
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public void CancelAll() => _cts.Cancel();
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}
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