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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.
/* TEST: Usage
* DESCRIPTION: Three usage scenarios that monitor the number of live handles and GC Collections
*/
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
// the class that holds the HandleCollectors
public class HandleCollectorTest
{
private static HandleCollector s_hc = new HandleCollector("hc", 100);
public HandleCollectorTest()
{
s_hc.Add();
}
public static int Count
{
get { return s_hc.Count; }
}
~HandleCollectorTest()
{
s_hc.Remove();
}
public static void Reset()
{
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
s_hc = new HandleCollector("hc", 100);
}
}
public class Usage
{
private int _numTests = 0;
private int _numInstances = 100;
private const int deltaPercent = 10;
// ensures GC Collections occur when handle count exceeds maximum
private bool Case1()
{
_numTests++;
// clear GC
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
HandleCollectorTest h;
int original = GC.CollectionCount(0);
// create objects and let them go out of scope
for (int i = 0; i < _numInstances; i++)
h = new HandleCollectorTest();
h = null;
GC.WaitForPendingFinalizers();
// Collection should not have occurred
if (GC.CollectionCount(0) != original)
{
Console.WriteLine("Early collection!");
Console.WriteLine("Case 1 Failed!");
return false;
}
new HandleCollectorTest();
if ((GC.CollectionCount(0) - original) > 0)
{
Console.WriteLine("Case 1 Passed!");
return true;
}
Console.WriteLine("Expected collection did not occur!");
Console.WriteLine("Case 1 Failed!");
return false;
}
// ensures GC Collection does not occur when handle count stays below maximum
private bool Case2()
{
_numTests++;
int handleCount = 0;
for (int i = 0; i < _numInstances; i++)
{
new HandleCollectorTest();
GC.WaitForPendingFinalizers();
handleCount = HandleCollectorTest.Count;
//Note that the GC should occur when handle count is 101 but it will happen at anytime after a creation and we stick to the previous
//count to avoid error
}
Console.WriteLine("{0}, {1}", handleCount, _numInstances);
if (handleCount == _numInstances)
{
Console.WriteLine("Case 2 Passed!");
return true;
}
Console.WriteLine("Case 2 Failed!");
return false;
}
// ensures GC Collections frequency decrease by threshold
private bool Case3()
{
_numTests++;
int gcCount = GC.CollectionCount(2);
int handleCount = HandleCollectorTest.Count;
int prevHandleCount = HandleCollectorTest.Count;
List<HandleCollectorTest> list = new List<HandleCollectorTest>();
for (int i = 0; i < deltaPercent; i++)
{
do
{
HandleCollectorTest h = new HandleCollectorTest();
if ((HandleCollectorTest.Count % 2) == 0)
list.Add(h);
GC.WaitForPendingFinalizers();
if (GC.CollectionCount(2) != gcCount)
{
gcCount = GC.CollectionCount(2);
break;
}
else
handleCount = HandleCollectorTest.Count;
} while (true);
// ensure threshold is increasing
if (!CheckPercentageIncrease(handleCount, prevHandleCount))
{
Console.WriteLine("Percentage not increasing, performing Collect/WFPF/Collect cycle");
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
if (handleCount == HandleCollectorTest.Count)
{
Console.WriteLine("No handles finalized in Collect/WFPF/Collect cycle");
return false;
}
}
prevHandleCount = handleCount;
}
Console.WriteLine("Case 3 Passed!");
return true;
}
// Checks that the threshold increases are within 0.2 error margine of deltaPercent
private bool CheckPercentageIncrease(int current, int previous)
{
bool retValue = true;
if (previous != 0)
{
double value = ((double)(current - previous)) / (double)previous;
double expected = (double)deltaPercent / 100;
double errorMargin = Math.Abs((double)(value - expected) / (double)expected);
retValue = (errorMargin < 0.2);
}
return retValue;
}
public bool RunTest()
{
int numPassed = 0;
if (Case1())
{
numPassed++;
}
HandleCollectorTest.Reset();
if (Case2())
{
numPassed++;
}
HandleCollectorTest.Reset();
if (Case3())
{
numPassed++;
}
return (numPassed == _numTests);
}
public static int Main()
{
if (GC.CollectionCount(0) > 20)
{
Console.WriteLine("GC Stress is enabled");
Console.WriteLine("Abort Test");
return 100;
}
Usage u = new Usage();
if (u.RunTest())
{
Console.WriteLine();
Console.WriteLine("Test Passed!");
return 100;
}
Console.WriteLine();
Console.WriteLine("Test Failed!");
return 1;
}
}
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