A C# Task pool I wrote that runs a maximum number of tasks concurrently equal to ProcessorCount. Usage: Task.Run() => TaskMan.Run()

LICENSE

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.

In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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TaskMan.cs

static class TaskMan
{
    static readonly ConcurrentQueue<Waiter> Queue = new ConcurrentQueue<Waiter>();

    static readonly int    MaxDegreeOfParallelism = Environment.ProcessorCount;
    static          int    _runningTasks;
    static readonly object LockHyde = new object();

    static int RunningTasks {
        get {
            lock (LockHyde) {
                return _runningTasks;
            }
        }
        set {
            lock (LockHyde) {
                _runningTasks = value;
                if (_runningTasks >= MaxDegreeOfParallelism) return;
                if (Queue.Count <= 0) return;
                if(Queue.TryDequeue(out Waiter waiter)) waiter.Ready?.SetResult(true);
            }
        }
    }

    internal static async Task Run(Action action) {
        int runningTasks;
        lock (LockHyde) {
            runningTasks = RunningTasks;
        }

        if (runningTasks < MaxDegreeOfParallelism) {
            lock (LockHyde) {
                RunningTasks += 1;
            }

            await Task.Run(action);
            lock (LockHyde) {
                RunningTasks -= 1;
            }
        } else {
            await new Waiter(action).Run();
        }
    }

    readonly struct Waiter
    {
        readonly          Action                     action;
        internal readonly TaskCompletionSource<bool> Ready;

        internal Waiter(Action action) {
            this.action = action;
            Ready       = new TaskCompletionSource<bool>();
        }

        internal async Task Run() {
            Queue.Enqueue(this);
            await Ready.Task;
            await TaskMan.Run(action);
        }
    }
}