public void TestReadWriteLockSlim()
{
var sentry = new ReaderWriterLockSlim();
var sw = new Stopwatch();
sw.Start();
var barrier = new CountdownEvent(4);
//first read
ThreadPool.QueueUserWorkItem(_ =>
{
using (sentry.UsingReadLock())
{
Console.WriteLine("Acquired read: {0}ms, thread={1}", sw.ElapsedMilliseconds,
Thread.CurrentThread.ManagedThreadId);
Thread.Sleep(500);
Console.WriteLine("Releasing read: {0}ms, thread={1}", sw.ElapsedMilliseconds,
Thread.CurrentThread.ManagedThreadId);
}
barrier.Signal();
});
//write
ThreadPool.QueueUserWorkItem(_ =>
{
Thread.Sleep(100);
using (sentry.UsingWriteLock())
{
Console.WriteLine("Acquired write: {0}ms, thread={1}", sw.ElapsedMilliseconds,
Thread.CurrentThread.ManagedThreadId);
Thread.Sleep(500);
Console.WriteLine("Releasing write: {0}ms, thread={1}", sw.ElapsedMilliseconds,
Thread.CurrentThread.ManagedThreadId);
}
barrier.Signal();
});
//read that starts after write but executes before
ThreadPool.QueueUserWorkItem(_ =>
{
Thread.Sleep(200);
using (sentry.UsingReadLock())
{
Console.WriteLine("Acquired read: {0}ms, thread={1}", sw.ElapsedMilliseconds,
Thread.CurrentThread.ManagedThreadId);
Thread.Sleep(500);
Console.WriteLine("Releasing read: {0}ms, thread={1}", sw.ElapsedMilliseconds,
Thread.CurrentThread.ManagedThreadId);
}
barrier.Signal();
});
//this read task must wait for write on
ThreadPool.QueueUserWorkItem(_ =>
{
Thread.Sleep(1000);
using (sentry.UsingReadLock())
{
Console.WriteLine("Acquired read: {0}ms, thread={1}", sw.ElapsedMilliseconds,
Thread.CurrentThread.ManagedThreadId);
Thread.Sleep(500);
Console.WriteLine("Releasing read: {0}ms, thread={1}", sw.ElapsedMilliseconds,
Thread.CurrentThread.ManagedThreadId);
}
barrier.Signal();
});
barrier.Wait();
sw.Stop();
Console.WriteLine("Test finished");
}
