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[ReaderWriterLockSlimクラス](https://docs.microsoft.com/ja-jp/dotnet/api/system.threading.readerwriterlockslim?redirectedfrom=MSDN&view=netframework-4.8)はどうでしょう？
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単純なサンプルです
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```C#
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using System;
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using System.Threading.Tasks;
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using System.Threading;
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namespace ConsoleApp1
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{
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class Program
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{
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static void Main(string[] args)
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{
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readthread1();
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readthread2();
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writethread();
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Console.ReadKey();
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}
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static ReaderWriterLockSlim lockslim = new ReaderWriterLockSlim(LockRecursionPolicy.NoRecursion);
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static void readthread1()
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{
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Task.Run(() =>
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{
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while (true)
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{
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lockslim.EnterReadLock();
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Console.WriteLine("Read Thread1 実行開始");
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Thread.Sleep(100);
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Console.WriteLine("Read Thread1 実行終了");
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lockslim.ExitReadLock();
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Thread.Sleep(200);
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}
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});
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}
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static void readthread2()
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{
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Task.Run(() =>
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{
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while (true)
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{
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lockslim.EnterReadLock();
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Console.WriteLine("Read Thread2 実行開始");
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Thread.Sleep(200);
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Console.WriteLine("Read Thread2 実行終了");
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lockslim.ExitReadLock();
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Thread.Sleep(300);
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}
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});
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}
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static void writethread()
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{
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Task.Run(() =>
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{
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while (true)
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{
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lockslim.EnterWriteLock();
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Console.WriteLine("Write Thread 実行開始");
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Thread.Sleep(2000);
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Console.WriteLine("Write Thread 実行終了");
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lockslim.ExitWriteLock();
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Thread.Sleep(300);
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}
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});
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}
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}
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}
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```
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このような感じに出力されます。
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```
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Read Thread1 実行開始
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Read Thread2 実行開始
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Read Thread1 実行終了
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Read Thread2 実行終了
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Write Thread 実行開始
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Write Thread 実行終了
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Read Thread2 実行開始
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Read Thread1 実行開始
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Read Thread1 実行終了
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Read Thread2 実行終了
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Read Thread1 実行開始
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Read Thread1 実行終了
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Write Thread 実行開始
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Write Thread 実行終了
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Read Thread2 実行開始
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Read Thread1 実行開始
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Read Thread1 実行終了
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Read Thread2 実行終了
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Read Thread1 実行開始
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Read Thread1 実行終了
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Write Thread 実行開始
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Write Thread 実行終了
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Read Thread2 実行開始
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Read Thread1 実行開始
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Read Thread1 実行終了
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```
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