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When the CLR is attempting to locate unreachable objects, is does not literally examine each and every object placed on the managed heap. Doing so, obviously, would involve considerable time, especially in larger (i.e., real-world) applications. To help optimize the process, each object on the heap is assigned to a specific generation. The idea behind generations is simple: the longer an object has existed on the heap, the more likely it is to stay there. For example, the class that defined the main window of a desktop application will be in memory until the program terminates. Conversely, objects that have only recently been placed on the heap (such as an object allocated within a method scope) are likely to be unreachable rather quickly. Given these assumptions, each object on the heap belongs to one of the following generations: Generation 0: Identifies a newly allocated object that has never been marked for collection. Generation 1: Identifies an object that has survived a garbage collection (i.e., it was marked for collection but was not removed due to the fact that the sufficient heap space was acquired). Generation 2: Identifies an object that has survived more than one sweep of the garbage collector.

/** * Menu callback; logs the current user out, and redirects to drupal.org. * This is a modified version of user_logout(). */ function menufun_user_logout() { global $user; watchdog('menufun', 'Session closed for %name.', array('%name' => $user->name)); // Destroy the current session: session_destroy(); // Run the 'logout' operation of the user hook so modules can respond // to the logout if they want to. module_invoke_all('user', 'logout', NULL, $user); // Load the anonymous user so the global $user object will be correct // on any hook_exit() implementations. $user = drupal_anonymous_user(); } drupal_goto('http://drupal.org/');

Note Generations 0 and 1 are termed ephemeral generations. As explained in the next section, you will see that the garbage collection process does treat ephemeral generations differently.

The garbage collector will investigate all generation 0 objects first. If marking and sweeping (or said more plainly, getting rid of) these objects results in the required amount of free memory, any surviving objects are promoted to generation 1. To see how an object s generation affects the collection process, ponder Figure 8-5, which diagrams how a set of surviving generation 0 objects (A, B, and E) are promoted once the required memory has been reclaimed.

Before our hook_menu_alter() implementation ran, the menu item for the logout path looked like this: array( 'access callback' 'file' 'module' 'page callback' 'title' 'weight' ) => => => => => => 'user_is_logged_in', 'user.pages.inc', 'user', 'user_logout', 'Log out', 10,

If all generation 0 objects have been evaluated, but additional memory is still required, generation 1 objects are then investigated for reachability and collected accordingly. Surviving generation 1 objects are then promoted to generation 2. If the garbage collector still requires additional memory, generation 2 objects are evaluated. At this point, if a generation 2 object survives a garbage collection, it remains a generation 2 object given the predefined upper limit of object generations. The bottom line is that by assigning a generational value to objects on the heap, newer objects (such as local variables) will be removed quickly, while older objects (such as a program s application object) are not bothered as often.

Concurrent Garbage Collection under .NET 1.0 - 3.5

And after we have altered it, the page callback is now set to menufun_user_logout: array( 'access callback' 'module' 'page callback' 'title' 'weight' ) => => => => => 'user_is_logged_in', 'user', 'menufun_user_logout', 'Log out', 10,

Prior to .NET 4.0, the runtime would clean up unused objects using a technique termed concurrent garbage collection. Under this model, when a collection takes place for any generation 0 or generation 1 objects (recall these are ephemeral generations), the garbage collector temporarily suspends all active threads within the current process to ensure that the application does not access the managed heap during the collection process. We will examine the topic of threads in 19; however, for the time being, simply regard a thread as a path of execution within a running executable. Once the garbage collection cycle has completed, the suspended threads are permitted to carry on their work. Thankfully, the .NET 3.5 (and earlier) garbage collector was highly optimized; you seldom (if ever) noticed this brief interruption in your application. As an optimization, concurrent garbage collection allowed objects that were not located in one of the ephemeral generations to be cleaned up on a dedicated thread. This decreased (but didn t eliminate) the need for the .NET runtime to suspect active threads. Moreover, concurrent garbage collection allowed your program to continue allocating objects on the heap during the collection of nonephemeral generations.