public static async Task InvalidExits()
{
using (var rwLock = new AsyncReaderWriterLock())
{
Throws <SynchronizationLockException>(rwLock.ExitReadLock);
Throws <SynchronizationLockException>(rwLock.ExitUpgradeableReadLock);
Throws <SynchronizationLockException>(rwLock.ExitWriteLock);
await rwLock.EnterReadLock(TimeSpan.FromMilliseconds(10));
Throws <SynchronizationLockException>(rwLock.ExitUpgradeableReadLock);
Throws <SynchronizationLockException>(rwLock.ExitWriteLock);
rwLock.ExitReadLock();
await rwLock.EnterUpgradeableReadLock(TimeSpan.FromMilliseconds(10));
Throws <SynchronizationLockException>(rwLock.ExitReadLock);
Throws <SynchronizationLockException>(rwLock.ExitWriteLock);
rwLock.ExitUpgradeableReadLock();
await rwLock.EnterWriteLock(TimeSpan.FromMilliseconds(10));
Throws <SynchronizationLockException>(rwLock.ExitReadLock);
Throws <SynchronizationLockException>(rwLock.ExitUpgradeableReadLock);
rwLock.ExitWriteLock();
}
}
public static async Task WriterToUpgradeableReaderChain()
{
using (var are = new AutoResetEvent(false))
using (var rwLock = new AsyncReaderWriterLock())
{
await rwLock.EnterWriteLock(InfiniteTimeSpan);
var task = new TaskCompletionSource <bool>();
ThreadPool.QueueUserWorkItem(async state =>
{
False(await rwLock.TryEnterUpgradeableReadLock(TimeSpan.FromMilliseconds(10)));
True(ThreadPool.QueueUserWorkItem(ev => ev.Set(), are, false));
await rwLock.EnterUpgradeableReadLock(InfiniteTimeSpan);
rwLock.ExitUpgradeableReadLock();
task.SetResult(true);
});
are.WaitOne();
rwLock.ExitWriteLock();
await task.Task;
}
}