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Monitoring and Controlling the Lifetime of Objects Manually
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The CLR provides each AppDomain with a GC handle table . This table allows an application to monitor the lifetime of an object or manually control the lifetime of an object . When an AppDomain is created, the table is empty . Each entry on the table consists of a pointer to an object on the managed heap and a flag indicating how you want to monitor or control the object . An application adds and removes entries from the table via the System.Runtime. InteropServices.GCHandle type shown below . Since the GC handle table is used mostly in scenarios when you are interoperating with unmanaged code, most of GCHandle s members have the [SecurityCritical] attribute applied to them .
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// This type is defined in the System.Runtime.InteropServices namespace public struct GCHandle { // Static methods that create an entry in the table public static GCHandle Alloc(object value); public static GCHandle Alloc(object value, GCHandleType type); // Static methods that convert a GCHandle to an IntPtr public static explicit operator IntPtr(GCHandle value); public static IntPtr ToIntPtr(GCHandle value); // Static methods that convert an IntPtr to a GCHandle public static explicit operator GCHandle(IntPtr value); public static GCHandle FromIntPtr(IntPtr value); // Static methods that compare two GCHandles public static Boolean operator ==(GCHandle a, GCHandle b); public static Boolean operator !=(GCHandle a, GCHandle b);
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// Instance method to free the entry in the table (index is set to 0) public void Free(); // Instance property to get/set the entry's object reference public object Target { get; set; } // Instance property that returns true if index is not 0 public Boolean IsAllocated { get; } // For a pinned entry, this returns the address of the object public IntPtr AddrOfPinnedObject(); public override Int32 GetHashCode(); public override Boolean Equals(object o); }
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Basically, to control or monitor an object s lifetime, you call GCHandle s static Alloc method, passing a reference to the object that you want to monitor/control, and a GCHandleType, which is a flag indicating how you want to monitor/control the object . The GCHandleType type is an enumerated type defined as follows:
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public enum GCHandleType { Weak = 0, // Used WeakTrackResurrection = 1, // Used Normal = 2, // Used Pinned = 3 // Used } for for for for monitoring an object s existence monitoring an object s existence controlling an object s lifetime controlling an object s lifetime
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Now, here s what each flag means:
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This flag allows you to monitor the lifetime of an object . Specifically, you can detect when the garbage collector has determined this object to be unreachable from application code . Note that the object s Finalize method may or may not have executed yet and therefore, the object may still be in memory .
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Weak
This flag allows you to monitor the lifetime of an object . Specifically, you can detect when the garbage collector has determined that this object is unreachable from application code . Note that the object s Finalize method (if it exists) has definitely executed, and the object s memory has been reclaimed .
WeakTrackResurrection
This flag allows you to control the lifetime of an object . Specifically, you are telling the garbage collector that this object must remain in memory even though there may be no variables (roots) in the application that refer to this object . When a garbage collection runs, the memory for this object can be compacted (moved) . The Alloc method that doesn t take a GCHandleType flag assumes that GCHandleType.Normal is specified .
Normal
This flag allows you to control the lifetime of an object . Specifically, you are telling the garbage collector that this object must remain in memory even though there might be no variables (roots) in the application that refer to this object . When a
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