public void TestReadWriteLock_NonConcurrent()
{
using (var rwlock = new ReadWriteLock())
{
using (rwlock.EnterReadScope()) { }
using (rwlock.EnterWriteScope()) { }
using (rwlock.EnterUpgradeableReadScope())
using (rwlock.EnterWriteScope()) { }
rwlock.Dispose();
}
}
public void TestReadWriteLock_MultipleWrites()
{
var rwlock = new ReadWriteLock();
var random = new Random();
int value = 0;
Action action = () =>
{
using (rwlock.EnterWriteScope())
{
var v = value;
Thread.Sleep(random.Next(10));
var tmp = v + 100;
Thread.Sleep(random.Next(10));
value = tmp;
}
};
var tasks = Enumerable.Range(1, 100)
.Select(i => Task.Factory.StartNew(action))
.ToArray();
Task.WaitAll(tasks);
const int expected = 100 * 100;
Assert.AreEqual(expected, value);
}
public void TestReadWriteLock_NoWriteWhileReading()
{
// ReSharper disable AccessToModifiedClosure
// ReSharper disable AccessToDisposedClosure
// ReSharper disable ImplicitlyCapturedClosure
using (var rwlock = new ReadWriteLock())
{
string value = "foo";
const string expected = "foo";
string actual = null;
var ewh1 = new EventWaitHandle(false, EventResetMode.ManualReset);
var ewh2 = new EventWaitHandle(false, EventResetMode.ManualReset);
var task1 = Task.Factory.StartNew(() =>
{
using (rwlock.EnterReadScope())
{
ewh1.Set();
Assert.False(ewh2.WaitOne(TimeSpan.FromMilliseconds(100)));
Thread.Sleep(100);
actual = value;
}
Assert.True(ewh2.WaitOne(TimeSpan.FromSeconds(5)));
});
var task2 = Task.Factory.StartNew(() =>
{
Assert.True(ewh1.WaitOne(TimeSpan.FromSeconds(5)));
using (rwlock.EnterWriteScope())
value = "bar";
ewh2.Set();
});
Assert.True(task1.Wait(TimeSpan.FromSeconds(5)));
Assert.True(task2.Wait(TimeSpan.FromSeconds(5)));
Assert.AreEqual(expected, actual);
}
// ReSharper restore ImplicitlyCapturedClosure
// ReSharper restore AccessToDisposedClosure
// ReSharper restore AccessToModifiedClosure
}