Termination Handling - Win32 Programmer's Reference

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Termination Handling

A termination handler is a mechanism by which a developer ensures that a specific block of code is executed whenever flow of control leaves a particular guarded body of code. A termination handler consists of the following elements.

A guarded body of code
A block of termination code to be executed when the flow of control leaves the guarded body

Termination handlers are declared in language-specific syntax. In Microsoft C, they are implemented by the try-finally statement. For more information about the Microsoft C exception-handling syntax, see Syntax.

The guarded body of code can be a block of code, a set of nested blocks, or an entire procedure or function. Whenever the guarded body is executed, the block of termination code will be executed. The only exception to this is when the thread terminates during execution of the guarded body (for example, if the ExitThread or ExitProcess function is called from within the guarded body).

The termination block is executed when the flow of control leaves the guarded body, regardless of whether the guarded body terminated normally or abnormally. The guarded body is considered to have terminated normally when the last statement in the block is executed and control proceeds sequentially into the termination block. Abnormal termination occurs when the flow of control leaves the guarded body due to an exception, or due to a control statement such as return, goto, break, or continue. The AbnormalTermination function can be called from within the termination block to determine whether the guarded body terminated normally.

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