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an item has been added to the queue, the producer thread sends a signal using the method Monitor.Pulse to indicate an item is available. This will cause those threads that gave up the lock temporarily to wake up, for example, the consumer thread. However, the consumer thread executes when the producer thread calls Monitor.Exit; until then the consumer thread is ready in execute mode. There is one additional optimization with the producer-consumer implementation. In the simplest case, a single thread would constantly execute QueueProcessor. There is an optimization that can be implemented: a thread pool can be used. In the ThreadPoolProducerConsumer constructor, the method ThreadPool.QueueUserWorkItem uses thread pooling to execute the method QueueProcessor. In the implementation of QueueProcessor, the method ThreadPool. QueueUserWorkItem is called again before calling the delegate. This has the effect that there is always one thread waiting for an item in the queue, but multiple threads may be executing concurrently, processing items from the queue.

Listing 6-7. Adding a Timeout (timeouts.c) #include <gtk/gtk.h> static gboolean pulse_progress (GtkProgressBar*); int main (int argc, char *argv[]) { GtkWidget *window, *progress; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Timeouts"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 200, -1); progress = gtk_progress_bar_new (); gtk_progress_bar_set_pulse_step (GTK_PROGRESS_BAR (progress), 0.1); g_timeout_add (100, (GSourceFunc) pulse_progress, (gpointer) progress); gtk_container_add (GTK_CONTAINER (window), progress); gtk_widget_show_all (window); gtk_main (); return 0; } /* Pulse the progress bar and return TRUE so the timeout is called again. */ static gboolean pulse_progress (GtkProgressBar *progress) { static gint count = 0; gtk_progress_bar_pulse (progress); i++; return (i < 25); } Timeout functions are added with g_timeout_add() or g_timeout_add_full(). The only difference between these two functions is that the latter allows you to specify a GDestroyNotify function, which will be called when you return FALSE to remove the timeout function.

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A lot of what is happening during the context switches is marshaling of parameters between native types and managed types Marshaling for primitive types is straightforward and actually doesn t involve any work at runtime Marshaling character, string, and structure types is not as straightforward Table 13-2 shows the default mappings used So, if the type used in the native function you re calling is as shown in one of the first two columns, the type in the P/Invoke signature should be one of the types in the last two columns You can change the default marshaling that P/Invoke employs by using the MarshalAs attribute Marshaling for more complex types is not as simple The Marshal class in the namespace System::Runtime::InteropServices provides many useful methods for interoperability It doesn t take a lot of complexity before using P/Invoke gets pretty ugly.

guint g_timeout_add_full (gint priority, guint interval_in_milliseconds, GSourceFunc timeout_function, gpointer data, GDestroyNotify destroy_function); The first parameter of g_timeout_add_full() allows you to define the priority of the timeout. In most cases, you will want to use G_PRIORITY_DEFAULT as the timeout function s priority. A list of the available priorities follows: G_PRIORITY_HIGH: This priority is not used anywhere within GLib or GTK+, so this type of function will take precedence over all others. Therefore, it should not be used in most cases, because CPU-intensive computations could cause the user interface to be temporarily unresponsive. G_PRIORITY_DEFAULT: This priority is used for most timeouts and X events in GDK. It should not be used with idle functions, because they could disrupt more important function calls needed by the application. G_PRIORITY_HIGH_IDLE: High priority idle functions use this. Redrawing widgets has a slightly higher priority, so this will not interfere with or slow most GTK+ actions. G_PRIORITY_DEFAULT_IDLE: You should use this priority for most idle functions. G_PRIORITY_LOW: This is not used anywhere within GLib or GTK+, so everything will take precedence over these actions. The second parameter of g_timeout_add_full() defines the interval of time in milliseconds between every call to the function. In Listing 6-7, the timeout was called every tenth of a second, or 100 milliseconds. There is no reason to worry about the overlapping of timeout function calls, because the next interval is calculated based on when the previous call returns. Therefore, if the timeout function takes 3 seconds to return, that time will be added to the interval.

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