Object Pointer in .NET

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Figure 3.2 Objects and process handle tables.
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Named objects are arranged in hierarchical directories, but the Win32 API restricts user-mode applications access to these directories. Here s a quick run-though of the most interesting directories: BaseNamedObjects This directory is where all conventional Win32 named objects, such as mutexes, are stored. All named-object Win32 APIs automatically use this directory application programs have no control over this. Devices This directory contains the device objects for all currently active system devices. Generally speaking each device driver has at least one entry in this directory, even those that aren t connected to any physical device. This includes logical devices such as Tcp, and physical devices such as Harddisk0. Win32 APIs can never directly access object in this directory they must use symbolic links (see below). GLOBAL This directory (also named in older versions of Windows) is the symbolic link directory. Symbolic links are old-style names for kernel objects. Old-style naming is essentially the DOS naming scheme, which you ve surely used. Think about assigning each drive a letter, such as C:, and about accessing physical devices using an 8-letter name that ends with a colon, such as COM1:. These are all DOS names, and in modern versions of Windows they are linked to real devices in the Devices directory using symbolic links. Win32 applications can only access devices using their symbolic link names. Some kernel objects are unnamed and are only identified by their handles or kernel object pointers. A good example of such an object is a thread object, which is created without a name and is only represented by handles (from user mode) and by a direct pointer into the object (from kernel mode).
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Processes and threads are both basic structural units in Windows, and it is crucial that you understand exactly what they represent. The following sections describe the basic concepts of processes and threads and proceed to discuss the details of how they are implemented in Windows.
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A process is a fundamental building block in Windows. A process is many things, but it is predominantly an isolated memory address space. This address space can be used for running a program, and address spaces are created for every program in order to make sure that each program runs in its own address space. Inside a process s address space the system can load code modules, but in order to actually run a program, a process must have at least one thread running.
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A thread is a primitive code execution unit. At any given moment, each processor in the system is running one thread, which effectively means that it s just running a piece of code; this can be either program or operating system code, it doesn t matter. The idea with threads is that instead of continuing to run a single piece of code until it is completed, Windows can decide to interrupt a running thread at any given moment and switch to another thread. This process is at the very heart of Windows ability to achieve concurrency. It might make it easier to understand what threads are if you consider how they are implemented by the system. Internally, a thread is nothing but a data structure that has a CONTEXT data structure telling the system the state of the processor when the thread last ran, combined with one or two memory blocks that are used for stack space. When you think about it, a thread is like a little virtual processor that has its own context and its own stack. The real physical processor switches between multiple virtual processors and always starts execution from the thread s current context information and using the thread s stack. The reason a thread can have two stacks is that in Windows threads alternate between running user-mode code and kernel-mode code. For instance, a typical application thread runs in user mode, but it can call into system APIs that are implemented in kernel mode. In such cases the system API code runs in kernel mode from within the calling thread! Because the thread can run in both user mode and kernel mode it must have two stacks: one for when it s running in user mode and one for when it s running in kernel mode. Separating the stacks is a basic security and robustness requirement. If user-mode code had access to kernel stacks the system would be vulnerable to a variety of malicious attacks and its stability could be compromised by application bugs that could overwrite parts of a kernel stack. The components that manage threads in Windows are the scheduler and the dispatcher, which are together responsible for deciding which thread gets to run for how long, and for performing the actual context switch when its time to change the currently running thread.
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