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Nobody enjoys working with an application which is slow and sluggish during its execution. Moreover, nobody enjoys starting a task in an application (perhaps initiated by the clicking of a toolbar item) which prevents other parts of the program from being as responsive as possible. Before the release of .NET, building applications that had the ability to perform multiple tasks required authoring very complex C++ code and the Windows threading APIs. Thankfully, the .NET platform provides a number of ways for you to build software which can perform complex operations on unique paths of execution, with far less fuss and bother. This chapter begins by revisiting the .NET delegate type to investigate its intrinsic support for asynchronous method invocations. As you ll see, this technique allows you to invoke a method on a secondary thread of execution without needing to manually create or configure the thread itself. Next, you ll be introduced to the System.Threading namespace. Here you ll examine numerous types (Thread, ThreadStart, etc.) that allow you to easily create additional threads of execution. As well, you will learn about various synchronization primitives that the .NET Framework provides, which helps ensure that multiple threads can share data in a non-volatile manner. The final part of this chapter will examine the brand new .NET 4.0 Task Parallel Library (TPL) and PLINQ (Parallel LINQ). Using these APIs, you can program against a set of higher level types, which do a good deal to manage thread details on your behalf.

In 16, a thread was defined as a path of execution within an executable application. While many .NET applications can live happy and productive single-threaded lives, an assembly s primary thread (spawned by the CLR when Main() executes) may create secondary threads of execution to perform additional units of work. By implementing additional threads, you can build more responsive (but not necessarily faster executing on single-core machines) applications.

The system table contains a list of all modules, themes, and theme engines that are or have been installed in Drupal s file system. Table A-91. system

Note These days it is quite common for new computers to make use of multicore processors (or at very least a hyperthreaded single-core processor). Without making use of multiple threads, developers are unable to exploit the full power of multicore machines.

The SystemThreading namespace contains various types that allow you to create multithreaded applications The Thread class is perhaps the core type, as it represents a given thread If you wish to programmatically obtain a reference to the thread currently executing a given member, simply call the static ThreadCurrentThread property: static void ExtractExecutingThread() { // Get the thread currently // executing this method Thread currThread = ThreadCurrentThread; } Under the NET platform, there is not a direct one-to-one correspondence between application domains and threads In fact, a given AppDomain can have numerous threads executing within it at any given time Furthermore, a particular thread is not confined to a single application domain during its lifetime Threads are free to cross application domain boundaries as the Windows thread scheduler and CLR see fit.

The path of the primary file for this item, relative to the Drupal root; e.g., modules/node/node.module The name of the item; for example, node The type of the item: module, theme, or theme_engine A theme s parent ; can be either a theme or an engine

Although active threads can be moved between AppDomain boundaries, a given thread can execute within only a single application domain at any point in time (in other words, it is impossible for a single thread to be doing work in more than one AppDomain at once) When you wish to programmatically gain access to the AppDomain that is hosting the current thread, call the static ThreadGetDomain() method: static void ExtractAppDomainHostingThread() { // Obtain the AppDomain hosting the current thread AppDomain ad = ThreadGetDomain(); } A single thread may also be moved into a particular context at any given time, and it may be relocated within a new context at the whim of the CLR When you wish to obtain the current context a thread happens to be executing in, make use of the static ThreadCurrentContext property (which returns a SystemRuntimeRemotingContexts.