Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Sys / System / Runtime / InteropServices / HandleCollector.cs / 1 / HandleCollector.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== namespace System.Runtime.InteropServices { using System; using System.Threading; public sealed class HandleCollector { private const int deltaPercent = 10; // this is used for increasing the threshold. private string name; private int initialThreshold; private int maximumThreshold; private int threshold; private int handleCount; private int[] gc_counts = new int [3]; private int gc_gen = 0; public HandleCollector( string name, int initialThreshold ) : this( name, initialThreshold, int.MaxValue) { } public HandleCollector( string name, int initialThreshold, int maximumThreshold ) { if( initialThreshold < 0) { throw new ArgumentOutOfRangeException("initialThreshold", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } if( maximumThreshold < 0) { throw new ArgumentOutOfRangeException("maximumThreshold", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } if( initialThreshold > maximumThreshold) { throw new ArgumentException(SR.GetString(SR.Argument_InvalidThreshold)); } if ( name != null) { this.name = name; } else { this.name = String.Empty; } this.initialThreshold = initialThreshold; this.maximumThreshold = maximumThreshold ; this.threshold = initialThreshold; this.handleCount = 0; } public int Count { get {return handleCount;} } public int InitialThreshold { get { return initialThreshold;} } public int MaximumThreshold { get { return maximumThreshold;} } public string Name { get {return name;} } [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2001:AvoidCallingProblematicMethods")] // Keep call to GC.Collect() public void Add () { int gen_collect = -1; Interlocked.Increment( ref handleCount); if( handleCount < 0) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_HCCountOverflow)); } if (handleCount > threshold) { lock (this) { threshold = handleCount + (handleCount/deltaPercent); gen_collect = gc_gen; if (gc_gen < 2) { gc_gen++; } } } if ((gen_collect >= 0) && ((gen_collect == 0) || (gc_counts[gen_collect] == GC.CollectionCount (gen_collect)))) { GC.Collect (gen_collect); Thread.Sleep (10*gen_collect); } //don't bother with gen0. for (int i = 1; i < 3; i++) { gc_counts [i] = GC.CollectionCount (i); } } public void Remove () { Interlocked.Decrement( ref handleCount); if (handleCount < 0) { throw new InvalidOperationException(SR.GetString(SR.InvalidOperation_HCCountOverflow)); } int newThreshold = handleCount + handleCount/deltaPercent; if (newThreshold < (threshold - threshold/deltaPercent)) { lock( this) { if (newThreshold > initialThreshold) { threshold = newThreshold; } else { threshold = initialThreshold; } gc_gen = 0; } } for (int i = 1; i < 3; i++) { gc_counts [i] = GC.CollectionCount (i); } } } }
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