System.Threading.Tests.ReaderWriterLockTests.WaitingUpgradersTest C# (CSharp) Метод

        public static void WaitingUpgradersTest()
        {
            var trwl = new TestReaderWriterLock();
            trwl.AcquireReaderLock();

            var waitingUpgrader1AcquiredReadLock = new ManualResetEvent(false);
            Action waitForWaitingUpgrader1, waitForWaitingUpgrader2, waitForWaitingUpgrader3;
            Thread waitingUpgrader1 =
                ThreadTestHelpers.CreateGuardedThread(out waitForWaitingUpgrader1, () =>
                {
                    trwl.AcquireReaderLock();
                    waitingUpgrader1AcquiredReadLock.Set();
                    TestLockCookie tlc = trwl.UpgradeToWriterLock();
                    trwl.DowngradeFromWriterLock(tlc);
                    trwl.ReleaseReaderLock();
                });
            Action upgradeDowngradeLock =
                () =>
                {
                    TestLockCookie tlc = trwl.UpgradeToWriterLock();
                    trwl.DowngradeFromWriterLock(tlc);
                };
            Thread waitingUpgrader2 = ThreadTestHelpers.CreateGuardedThread(out waitForWaitingUpgrader2, upgradeDowngradeLock);
            Thread waitingUpgrader3 = ThreadTestHelpers.CreateGuardedThread(out waitForWaitingUpgrader3, upgradeDowngradeLock);
            waitingUpgrader1.IsBackground = true;
            waitingUpgrader2.IsBackground = true;
            waitingUpgrader1.Start();
            waitingUpgrader1AcquiredReadLock.CheckedWait();
            waitingUpgrader2.Start();
            waitingUpgrader3.Start();
            ThreadTestHelpers.WaitForCondition(() => (waitingUpgrader1.ThreadState & ThreadState.WaitSleepJoin) != 0);
            ThreadTestHelpers.WaitForCondition(() => (waitingUpgrader2.ThreadState & ThreadState.WaitSleepJoin) != 0);
            ThreadTestHelpers.WaitForCondition(() => (waitingUpgrader3.ThreadState & ThreadState.WaitSleepJoin) != 0);

            // Releasing the read lock releases a waiting upgrader, that writer downgrades its write lock, in turn releasing the
            // other upgrader, and so on
            trwl.ReleaseReaderLock();
            waitForWaitingUpgrader1();
            waitForWaitingUpgrader2();
            waitForWaitingUpgrader3();

            trwl.Dispose();
        }