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Shifting focus to the implementation of the Instance method, the first check is to see whether the data member _instance has been instantiated If _instance equals a null, which means no instantiation, then _instance is assigned an instance of Singleton<> When Singleton<> is instantiated, the constructor instantiates an ISingletonBuilder<> instance and assigns it to the data member _builder After the _builder variable has been assigned, a ReaderWriterLock is instantiated and assigned to the data member _lock The variable _lock will be discussed in more detail in a moment The last thing the constructor does is create a thread and execute the method SingletonThread The method SingletonThread is a polling thread that periodically checks for the validity of the singleton data What is different about the polling is the while loop that doesn t lock the data, but uses something called a reader-writer lock..

Listing 6-3. Memory Profiling (memprofile.c) #include <glib.h> int main (int argc, char *argv[]) { GSList *list = NULL; /* Set the GMemVTable to the default table. This needs to be called before * any other call to a GLib function. */ g_mem_set_vtable (glib_mem_profiler_table); /* Call g_mem_profile() when the application exits. */ g_atexit (g_mem_profile); list = (GSList*) g_malloc (sizeof (GSList)); list->next = (GSList*) g_malloc (sizeof (GSList)); /* Only free one of the GSList objects to see the memory profiler output. */ g_free (list->next); return 0; } Before you can output a memory usage summary, you have to set the GMemVTable with g_mem_set_vtable(). The GMemVTable defines new versions of memory allocation functions with profiling enabled, so they can be tracked by GLib. These include malloc(), realloc(), free(), calloc(), try_malloc(), and try_realloc(). Although it is possible to create your own GMemVTable, GLib provides a prebuilt version named glib_mem_profiler_table. In almost every case, the default memory table should be used. After defining the GMemVTable, Listing 6-3 uses g_atexit() so g_mem_profile() will be called when the application is exiting. Functions specified to g_atexit() must accept no parameters and return no value.

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Listing 13-2. Consuming a Wrapped Global Function in C# // consume_cpp.cs // Compile with csc /r:global_function.dll consume_cpp.cs. using G; class C { public static void Main() { // FGlobal(); // Error: global functions not available in C#. R.FMember(); // OK } }; The output of Listing 13-2 is as follows: C++/CLI Static Member Function. Global C++/CLI Function. Listing 13-3 shows a C++/CLI interface that is then implemented in a VB class in Listing 13-4. Listing 13-3. Creating an Interface in C++ // interface_example.cpp // Compile with cl /clr:pure /LD interface_example.cpp. public interface class ITest { void F(); void G(); }; Listing 13-4. Using an Interface in Visual Basic ' implement_example.vb ' Compile with vbc /r:interface_example.dll implement_example.vb. Public Class VBClass Implements ITest Public Sub F Implements ITest.F Console.WriteLine("F in VB") End Sub

The output of the application in Listing 6-3 follows. This output will vary depending on your GLib version, your system type, and various other factors. GLib Memory statistics (successful operations): blocks of | allocated | freed | allocated | freed | n_bytes n_bytes | n_times by | n_times by | n_times by | n_times by | remaining | malloc() | free() | realloc() | realloc() | ===========|============|============|============|============|=========== 8 | 2 | 1 | 0 | 0 | +8 GLib Memory statistics (failing operations): --- none --Total bytes: allocated=16, zero-initialized=0 (0.00%), freed=8 (50.00%), remaining=8 The preceding table shows the size of memory that is allocated, followed by how many times malloc() was called on it. It shows that two blocks of 8 bytes that represent the two GSList objects were allocated. It then shows how many blocks of memory were freed with free(), allocated with realloc(), and freed with realloc(). The last column shows the number of bytes of memory that are not freed. Since only one GSList object was freed, it shows that 8 bytes were leaked. The table illustrates only successful operations, because nothing failed within the application. If some type of failure in memory allocation or deallocation had occurred, there would be a second table to show those operations. A summary is given at the end of the output that shows totals of all of the information shown in the tables.

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