public void TestCheckingEnterExitOwnership()
{
var monitor = new MonitorSimple();
var finished = 0;
var th = new Thread(() =>
{
monitor.Enter();
while (finished == 0) { }
}) { IsBackground = true };
th.Start();
WaitAlittle();
AssertEx.Throws<SynchronizationLockException>(() => monitor.Exit());
Thread.VolatileWrite(ref finished, 1);
}
public LockHandle(MonitorSimple source)
{
_source = source;
}
public void TestEnterExitInGeneral()
{
const int threadCount = 10;
const int iterations = 100000;
long n = 0;
var montor = new MonitorSimple();
RunSimultanously(threadCount, () =>
{
for (var i = 0; i < iterations; i++)
{
using (montor.GetLocked())
using (montor.GetLocked())
using (montor.GetLocked())
{
n = n + 1;
if (i % 100 == 0)
Thread.SpinWait(10000);
}
}
}, true);
var expected = Enumerable.Repeat(1, iterations).Sum() * threadCount;
Assert.AreEqual(expected, n);
}
public void TestWait()
{
var e = new ManualResetEvent(false);
var m = new MonitorSimple();
var testValue = 0;
var th1 = new Thread(() =>
{
m.Enter();
testValue = 1;
e.WaitOne();
m.Wait();
testValue = 2;
m.Exit();
}) { Name = "th1" };
var th2 = new Thread(() =>
{
m.Enter();
testValue = 100;
m.Exit();
}) { Name = "th2" };
th1.Start();
WaitAlittle();
th2.Start();
WaitAlittle();
Assert.AreEqual(1, testValue);
e.Set();
WaitAlittle();
Assert.AreEqual(100, testValue);
m.Enter();
m.PulseAll();
m.Exit();
WaitAlittle();
Assert.AreEqual(2, testValue);
}
public void TestStressWait()
{
const int iterations = 1000000;
const int doHardWorkBeforeEachNthProducing = iterations / 100;
var threadCount = Environment.ProcessorCount;
var src = 0;
var dst = 0;
var addingCompleted = false;
var m = new MonitorSimple();
var readers = RunSimultanously(threadCount, () =>
{
while (true)
{
using (m.GetLocked())
using (m.GetLocked())
using (m.GetLocked())
{
while (src == 0 && !addingCompleted)
m.Wait();
if (addingCompleted && src == 0)
break;
src = src - 1;
dst = dst + 1;
}
}
}, false);
RunSimultanously(threadCount, () =>
{
for (var i = 0; i < iterations; i++)
{
if (i % doHardWorkBeforeEachNthProducing == 0)
DoHardWork();
using (m.GetLocked())
using (m.GetLocked()) //for extra stressing
{
src = src + 1;
// such a weird construct is for extra stressing
if (i % 2 == 0)
m.Pulse();
else
m.PulseAll();
}
}
}, true);
using (m.GetLocked())
{
addingCompleted = true;
m.PulseAll();
}
readers.ForEach(r => r.Join());
var expected = Enumerable.Repeat(1, iterations).Sum() * threadCount;
Assert.AreEqual(expected, dst);
}
public void TestStressLockedSectionsDoNotOverlapp()
{
const int iterations = 100000;
var entered = 0;
var overlapped = false;
var m = new MonitorSimple();
RunSimultanously(5, () =>
{
for (var i = 0; i < iterations; i++)
{
using (m.GetLocked())
using (m.GetLocked())
{
if (Interlocked.CompareExchange(ref entered, 1, 0) != 0)
overlapped = true;
Thread.SpinWait(i % 100 == 0 ? 10000 : 1);
if (Interlocked.CompareExchange(ref entered, 0, 1) != 1)
overlapped = true;
}
}
}, true);
Assert.IsTrue(entered == 0);
Assert.IsFalse(overlapped);
}