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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Threading;
/// <summary>
/// System.Threading.Interlocked.CompareExchange(ref object,object,object)
/// </summary>
// Tests that CompareExchange(object, object, object)
// plays nicely with another thread accessing shared state directly
// Also includes a test for when location = comparand = null (should
// switch).
public class InterlockedCompareExchange5
{
public static object globalValue;
public Thread threadA;
public Thread threadB;
public object state;
public myClass obMyClass;
#region Public Methods
public bool RunTests()
{
bool retVal = true;
TestLibrary.TestFramework.LogInformation("[Positive]");
retVal = PosTest1() && retVal;
retVal = PosTest2() && retVal;
retVal = PosTest3() && retVal;
return retVal;
}
#region Positive Test Cases
public bool PosTest1()
{
bool retVal = true;
TestLibrary.TestFramework.BeginScenario("PosTest1: The object is a string");
try
{
// Spin up two new threads
threadA = new Thread(new ThreadStart(TestComChange));
threadB = new Thread(new ThreadStart(changeGlobal));
// Start Thread A
// Thread A runs TestComChange
threadA.Start();
// Block spawning thread until Thread A completes
threadA.Join();
// Once Thread A completes, block spawning thread
// until Thread B completes as well
threadB.Join();
// now, the final values of
// globalValue and state should be "changedValue"
if (globalValue.ToString() != "changedValue" && state != (object)("changedValue"))
{
TestLibrary.TestFramework.LogError("001", "The method did not works, the result is" + globalValue + " " + state);
retVal = false;
}
}
catch (Exception e)
{
TestLibrary.TestFramework.LogError("002", "Unexpected exception: " + e);
retVal = false;
}
return retVal;
}
public bool PosTest2()
{
bool retVal = true;
TestLibrary.TestFramework.BeginScenario("PosTest2: The object is a custom class");
obMyClass = new myClass(123456789);
try
{
// Spin up two new threads
threadA = new Thread(new ThreadStart(TestComChange2));
threadB = new Thread(new ThreadStart(changeGlobal2));
// Start Thread A
// Thread A runs TestComChange2
threadA.Start();
// Block spawning thread until Thread A completes
threadA.Join();
// Once Thread A completes, block spawning thread
// until Thread B completes as well
threadB.Join();
// now, the final values of
// globalValue and state should NOT be -100
if (((myClass)globalValue).a != -100 && ((myClass)state).a != -100)
{
TestLibrary.TestFramework.LogError("003", "The method did not works, the result is" + globalValue + " " + state);
retVal = false;
}
}
catch (Exception e)
{
TestLibrary.TestFramework.LogError("004", "Unexpected exception: " + e);
retVal = false;
}
return retVal;
}
public bool PosTest3()
{
bool retVal = true;
TestLibrary.TestFramework.BeginScenario("PosTest3: The first argument is a null reference");
try
{
// a non-null object
object value = new myClass(-100);
// a null object
object comparand = null;
// a null initial state
globalValue = null;
// globalValue is null, so it should switch
// and return null
// this is a major difference with
// InterlockedCompareExchange8.cs --
// here we use the object overload
state = Interlocked.CompareExchange(ref globalValue, value, comparand);
// globalValue should equal value now
if (globalValue != value)
{
TestLibrary.TestFramework.LogError("005", "The method did not works, the result is" + globalValue + " " + state);
retVal = false;
}
}
catch (Exception e)
{
TestLibrary.TestFramework.LogError("006", "Unexpected exception: " + e);
retVal = false;
}
return retVal;
}
#endregion
#region Negative Test Cases
#endregion
#endregion
public static int Main()
{
InterlockedCompareExchange5 test = new InterlockedCompareExchange5();
TestLibrary.TestFramework.BeginTestCase("InterlockedCompareExchange5");
if (test.RunTests())
{
TestLibrary.TestFramework.EndTestCase();
TestLibrary.TestFramework.LogInformation("PASS");
return 100;
}
else
{
TestLibrary.TestFramework.EndTestCase();
TestLibrary.TestFramework.LogInformation("FAIL");
return 0;
}
}
public void TestComChange()
{
// set a value
object value = "changedValue";
// set a different value
object comparand = "comparand";
int i = 0;
// loop 20 times
while (i < 20)
{
// first ten times, we just skip this
// then on the tenth time, fire Thread B,
// setting globalValue to "Comparand"
if (i == 10)
{
threadB.Start();
}
// first ten iterations, globalValue does not
// equal comparand, so it keeps returning
// the contents of globalValue without
// poking value into it
// after ten, Thread B kicks in, and
// it matches, subsequently, globalValue
// gets set to "changedValue"
// this is a major difference with
// InterlockedCompareExchange8.cs --
// here we use the object overload
state = Interlocked.CompareExchange(ref globalValue, value, comparand);
i++;
Thread.Sleep(10);
}
}
public void changeGlobal()
{
// set when B runs
globalValue = "comparand";
}
public void TestComChange2()
{
// set a value
object value = new myClass(-100);
// set a different value
object comparand = obMyClass;
int i = 0;
// loop 20 times
while (i < 20)
{
// first ten times, we just skip this
// then on the tenth time, fire Thread B,
// setting globalValue to obMyClass
if (i == 10)
{
threadB.Start();
}
// first ten iterations, globalValue does not
// equal comparand, so it keeps returning
// the contents of globalValue without
// poking value into it
// after ten, Thread B kicks in, and
// it matches, subsequently, globalValue
// gets set to point to where value does
// this is a major difference with
// InterlockedCompareExchange8.cs --
// here we use the object overload
state = Interlocked.CompareExchange(ref globalValue, value, comparand);
i++;
Thread.Sleep(10);
}
}
public void changeGlobal2()
{
globalValue = obMyClass;
}
}
public class myClass
{
public int a;
public myClass(int value)
{
a = value;
}
}
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