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The TEB contains the head of the thread s exception-handling chain Each try block that the thread enters inserts a node in the head of this chain; the node is removed from the chain when the thread exists in the try block In addition, the TEB contains the thread s thread-local storage data as well as some data structures for use by Graphics Device Interface (GDI) and OpenGL graphics User-mode stack The user-mode stack is used for local variables and arguments passed to methods It also contains the address indicating what the thread should execute next when the current method returns By default, Windows allocates 1 MB of memory for each thread s user-mode stack 1 Kernel-mode stack The kernel-mode stack is also used when application code passes arguments to a kernel-mode function in the operating system .

This problem is solvable with a workaround that Scott Meyers describes in Effective C++, Item #47 (Meyers 1998). But the trickiness of the solution is representative of the extra complexity that using global data introduces.

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For security reasons, Windows copies any arguments passed from user-mode code to the kernel from the thread s user-mode stack to the thread s kernel-mode stack Once copied, the kernel can verify the arguments values, and since the application code can t access the kernelmode stack, the application can t modify the arguments values after they have been validated and the OS kernel code begins to operate on them In addition, the kernel calls methods within itself and uses the kernel-mode stack to pass its own arguments, to store a function s local variables, and to store return addresses The kernel-mode stack is 12 KB when running on a 32-bit Windows system and 24 KB when running on a 64-bit Windows system ..

Modularity and intellectual manageability damaged by global data The essence of creating programs that are larger than a few hundred lines of code is managing complexity. The only way you can intellectually manage a large program is to break it into pieces so that you only have to think about one part at a time. Modularization is the most powerful tool at your disposal for breaking a program into pieces.

For native applications, Windows reserves the 1 MB of address space and sparsely commits physical storage to it as the thread actually requires it when growing the stack . However, when managed applications create a thread, the CLR forces Windows to reserve and fully commit the stack immediately, so 1 MB of physical storage is fully allocated as each thread is created . The CLR team did this to make managed code behave more reliably in situations where the system was running low on memory . For example, the CLR and managed applications never have to worry about recovering from insufficient memory when attempting to grow a thread s stack . This was very important for Microsoft SQL Server when executing stored procedures implemented in managed code .

When you ve configured the project s build options, you must configure the connection to the version control system (VCS) in other words, your source code repository (see figure 4.17). The source root configuration varies depending on the source control system you re using. Because you re using SVN, you must provide at least the SVN URL, username, and password. You have to decide whether to use the default configuration directory (you don t have to change this if you aren t doing anything extraordinary). You can choose to pull the source with all externals (you learned about this in chapter 2). You can leave all the rest of the settings at their defaults. The newly created source control root will be added to the project configuration.

DLL thread-attach and thread-detach notifications Windows has a policy that whenever a thread is created in a process, all DLLs loaded in that process have their DllMain method called, passing a DLL_THREAD_ATTACH flag . Similarly, whenever a thread dies, all DLLs in the process have their DllMain method called, passing it a DLL_THREAD_DETACH flag . Some DLLs need these notifications to perform some special initialization or cleanup for each thread created/destroyed in the process . For example, the C-Runtime library DLL allocates some thread-local storage state that is required should the thread use functions contained within the C-Runtime library .

Global data pokes holes in your ability to modularize. If you use global data, can you concentrate on one routine at a time No. You have to concentrate on one routine and every other routine that uses the same global data. Although global data doesn t completely destroy a program s modularity, it weakens it, and that s reason enough to try to find better solutions to your problems.