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To understand how Monitor works, let s consider the overall workings of a producer-consumer implementation The consumer thread (QueueProcessor) executes, constantly waiting for items in the queue (_queue) To check the queue, the method MonitorEnter is called, which says, I want exclusive control for a code block that ends with the method call MonitorExit To check the queue, a while loop is started, which waits until something appears in the queue The thread could execute, constantly waiting for something to be added, but while the thread is looping, it has control of the lock This means a producer thread can t add anything to the queue The consumer needs to give up the lock, but also be able to check whether anything is available in the queue The solution is to call Monitor.

Tip The gtk_dialog_run() function blocks the main loop from continuing by creating its own GLib main

loop with g_main_loop_new(). It will continue to run until g_main_loop_quit() is called on the loop.

int main() { IntPtr ptr = NativeLib::CreateObject(); int result = NativeLib::F( ptr, 50 ); Console::WriteLine( "Return value: {0} ", result ); NativeLib::DeleteObject( ptr ); } The output of Listing 13-9 is shown here: class NativeClass *__cdecl NativeClass::CreateObject(void) int __thiscall NativeClass::F(int) Return value: 51 void __cdecl NativeClass::DeleteObject(class NativeClass *)

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Wait, which causes the consumer thread to give up the lock and say, Hey, I m giving up the lock temporarily until somebody gives me a signal to continue processing When the consumer thread gives up its lock temporarily, it goes to sleep, waiting for a pulse The producer thread (Invoke) also enters a protected block using the method MonitorEnter Within the protected block, an item is added to the queue using the method Enqueue Because.

The GTK+ main loop implements the GLib main loop by creating a GMainLoop with the default context in gtk_main(). In short, the main loop functionality provided by functions in GTK+ is implemented in GLib. GLib supports the ability to create new event sources. Deriving from GSource creates new sources. GLib provides the ability to create new timeout and idle function sources with g_timeout_source_new() and g_idle_source_new(). These can be associated with your contexts. It is also possible to create a custom source with g_source_new(). This function accepts a table of functions and the structure size of the new source. These functions are used to define the behavior of the new source type. GSource* g_source_new (GSourceFuncs *source_funcs, guint struct_size); You should then associate the source with a GMainContext by calling g_source_attach(). This will return a unique integer identifier of the source within the context. For the scope of this book, you have learned enough about the main loop to understand the examples in the rest of this section. There is much more to the complexities of the main loop that will not be covered in this book. Therefore, if you have a need to create your own sources and contexts, you should reference the GLib API documentation.

As you can see, in order to use P/Invoke with class functions, whether static or nonstatic, you need the obfuscated names, which we obtain by running dumpbin.exe or link.exe /DUMP /EXPORTS as explained in the code comments. The static functions do not require a special calling convention, since they use the __cdecl calling convention. The member function F required the __thiscall calling convention, because the implicit parameter for any member function is a pointer to the object. The declaration of the P/Invoke function creates a managed name for the native function, as well as a small piece of code that in turn calls the native function. This piece of code is called a managed entry point to a native function, and it involves what is called a context switch between managed and native code. This is also called a managed to native transition or vice versa. Context switches add overhead to the function call. During a context switch, parameters are marshaled between native and managed types. The penalty is incurred again when the context switches back to managed code. You might say that execution is detained at the border for a time when crossing between managed and native code.

Timeout functions are methods that are called at a certain interval of time until FALSE is returned. They are added to the main loop with g_timeout_add_full() or g_timeout_add(). Listing 6-7 is a simple example that pulses a progress bar every tenth of a second. Since the progress bar is set to have a pulse step of 0.1, it will take approximately one second for the progress indicator to travel from one end of the progress bar to the other. The timeout is removed after 25 calls.

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