System.Threading.Tests.ReaderWriterLockTests.InvalidLockCookieTest C# (CSharp) Method

        public static void InvalidLockCookieTest()
        {
            // Invalid lock cookie created by using one up with Upgrade/Downgrade
            var trwl = new TestReaderWriterLock();
            TestLockCookie tlc = trwl.UpgradeToWriterLock();
            trwl.DowngradeFromWriterLock(tlc);
            trwl.AcquireWriterLock();
            trwl.DowngradeFromWriterLock(tlc, InvalidLockCookieExceptionHResult);
            trwl.ReleaseWriterLock();
            trwl.RestoreLock(tlc, InvalidLockCookieExceptionHResult);

            // Invalid lock cookie created by using one up with Release/Restore
            tlc = trwl.ReleaseLock();
            trwl.RestoreLock(tlc);
            trwl.AcquireWriterLock();
            trwl.DowngradeFromWriterLock(tlc, InvalidLockCookieExceptionHResult);
            trwl.ReleaseWriterLock();
            trwl.RestoreLock(tlc, InvalidLockCookieExceptionHResult);

            // Lock cookie owned by another thread
            ThreadTestHelpers.RunTestInBackgroundThread(() =>
            {
                TestLockCookie tlc2 = trwl.UpgradeToWriterLock();
                tlc = tlc2.Clone();
                trwl.DowngradeFromWriterLock(tlc2);
            });
            trwl.AcquireWriterLock();
            trwl.DowngradeFromWriterLock(tlc, InvalidLockCookieExceptionHResult);
            trwl.ReleaseWriterLock();
            trwl.RestoreLock(tlc, InvalidLockCookieExceptionHResult);

            trwl.Dispose();
        }