118 lines
3.6 KiB
C#
118 lines
3.6 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Reflection;
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using System.Text;
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using System.Threading;
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namespace System.Threading
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{
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/// <summary>
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/// 仅 2.0 或 3.0 下编绎使用，其它环境编绎可以移除。
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/// </summary>
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internal class ReaderWriterLockSlim
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{
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object readWriteLockSlim = null;
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MethodInfo enterReadLockMethod;
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MethodInfo exitReadLockMethod;
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MethodInfo enterWriteLockMethod;
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MethodInfo exitWriteLockMethod;
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private void Init(Assembly ass)
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{
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if (ass != null)
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{
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// 获取 ReaderWriterLockSlim 类型
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Type readWriteLockSlimType = ass.GetType("System.Threading.ReaderWriterLockSlim");
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if (readWriteLockSlimType != null)
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{
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// 创建 ReadWriteLockSlim 对象
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readWriteLockSlim = Activator.CreateInstance(readWriteLockSlimType);
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// 调用方法
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enterReadLockMethod = readWriteLockSlimType.GetMethod("EnterReadLock");
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enterWriteLockMethod = readWriteLockSlimType.GetMethod("EnterWriteLock");
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enterReadLockMethod.Invoke(readWriteLockSlim, null);
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// 阻塞以等待读取锁释放
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// ...
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// 释放读取锁
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exitReadLockMethod = readWriteLockSlimType.GetMethod("ExitReadLock");
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exitWriteLockMethod = readWriteLockSlimType.GetMethod("ExitWriteLock");
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exitReadLockMethod.Invoke(readWriteLockSlim, null);
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}
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}
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}
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public ReaderWriterLockSlim()
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{
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Assembly[] asList = AppDomain.CurrentDomain.GetAssemblies();
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foreach (Assembly ass in asList)
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{
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if (ass.FullName.StartsWith("System.Core"))
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{
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Version ver = ass.GetName().Version;
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if (ver.Major > 3)// || (ver.Major == 3 && ver.Minor == 5) 3.5版本性能好像也不咋的。
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{
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Init(ass);
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}
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return;
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}
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}
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}
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private object obj = new object();
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//ReaderWriterLock _lock = new ReaderWriterLock();//有 bug ，并发不稳定
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internal void TryEnterWriteLock(int p)
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{
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if (enterWriteLockMethod != null)
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{
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enterWriteLockMethod.Invoke(readWriteLockSlim, null);
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return;
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}
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Monitor.Enter(obj);
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//_lock.AcquireWriterLock(p);
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}
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internal void ExitWriteLock()
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{
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if (exitWriteLockMethod != null)
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{
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exitWriteLockMethod.Invoke(readWriteLockSlim, null);
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return;
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}
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Monitor.Exit(obj);
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// _lock.ReleaseWriterLock();
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}
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internal void TryEnterReadLock(int p)
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{
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if (enterReadLockMethod != null)
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{
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enterReadLockMethod.Invoke(readWriteLockSlim, null);
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return;
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}
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Monitor.Enter(obj);
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//_lock.AcquireReaderLock(p);
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}
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internal void ExitReadLock()
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{
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if (exitReadLockMethod != null)
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{
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exitReadLockMethod.Invoke(readWriteLockSlim, null);
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return;
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}
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Monitor.Exit(obj);
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//_lock.ReleaseReaderLock();
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}
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}
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}
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