public void PaddingTest()
{
using (var group = new ThreadGroup(2, createBackgroundThreads: true, name: "PaddingTest")
{
DefaultConcurrencyPadding = 1
}) {
var queue = group.GetQueueForType <HighPriorityBlockingWorkItem>();
var barrier1 = new HighPriorityBlockingWorkItem {
Signal = new AutoResetEvent(false)
};
queue.Enqueue(barrier1);
var barrier2 = new HighPriorityBlockingWorkItem {
Signal = new AutoResetEvent(false)
};
queue.Enqueue(barrier2);
group.NotifyQueuesChanged();
Thread.Sleep(300);
Assert.AreEqual(1, queue.ItemsInFlight);
barrier1.Signal.Set();
Assert.IsFalse(queue.WaitUntilDrained(150));
Assert.AreEqual(1, queue.ItemsInFlight);
barrier2.Signal.Set();
Assert.IsTrue(queue.WaitUntilDrained(150));
}
}
public void PriorityTest()
{
using (var group = new ThreadGroup(2, createBackgroundThreads: true, name: "PriorityTest")
{
DefaultConcurrencyPadding = 0
}) {
var queue = group.GetQueueForType <HighPriorityBlockingWorkItem>();
var barrier1 = new HighPriorityBlockingWorkItem {
Signal = new AutoResetEvent(false)
};
queue.Enqueue(barrier1);
var barrier2 = new HighPriorityBlockingWorkItem {
Signal = new AutoResetEvent(false)
};
queue.Enqueue(barrier2);
var barrier3 = new HighPriorityBlockingWorkItem {
Signal = new AutoResetEvent(false)
};
queue.Enqueue(barrier3);
group.NotifyQueuesChanged();
// HACK: Give the thread group time to start processing high priority items
while (queue.ItemsInFlight < group.ThreadCount)
{
Thread.Sleep(1);
}
var voidQueue = group.GetQueueForType <VoidWorkItem>();
var testItem = new VoidWorkItem();
for (int i = 0; i < 10; i++)
{
voidQueue.Enqueue(testItem);
}
group.NotifyQueuesChanged();
var ok = voidQueue.WaitUntilDrained(50);
Assert.IsFalse(ok, "wait for low priority queue to drain while threads are blocked on high priority");
barrier1.Signal.Set();
Assert.IsFalse(voidQueue.WaitUntilDrained(50), "ensure new high priority item is claimed by thread that finished previous one");
barrier2.Signal.Set();
barrier3.Signal.Set();
ok = voidQueue.WaitUntilDrained(500);
Assert.IsTrue(ok, "once high priority items are done the low priority ones should run");
}
}