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Much of the power of a view is contained in the SQL statement that defines the view. However, a number of syntax options in addition to the SELECT statement are important in building a view. The CREATE statement, with a complete list of user-defined fields looks like this: CREATE [OR REPLACE] [<algorithm attributes>] VIEW [database.]< name> [(<columns>)] AS <SELECT statement> [<check options>] When creating a view, you can use the OR REPLACE syntax to prevent a MySQL error in the instance that the view is already defined. In some cases, such as when you would rather be notified that you are overwriting an existing view, not using the OR REPLACE is preferred.

In the preceding listing, threads wt1 and wt2 are writer threads that acquire writer locks in the WriteInts() method, and threads rt1 and rt2 are reader threads that acquire reader locks in the ReadInts() method. In the WriteInts() method, the instance variables x and y are changed to the new values a and b, respectively. When thread wt1 or wt2 acquires a writer lock by calling AcquireWriterLock(), no other thread (including the reader threads rt1 and rt2) is allowed access to the object until the thread releases the lock by calling the ReleaseWriterLock() method. This, behavior is similar to that of Monitors. In the ReadInts() method, threads rt1 and rt2 acquire reader locks by calling the AcquireReaderLock() method. In the ReadInts() method, both rt1 and rt2 can be given concurrent access to the instance variables x and y. Until the reader threads release the reader lock, none of the writer threads (wt1 and wt2) is given access to the object. Only reader threads can have concurrent access to the object after acquiring the reader lock. Monitors might be too safe for threads that plan only to read the data rather than modify it. Monitors also have a performance hit associated with them, and for read-only access, this performance hit is not necessary. The ReaderWriterLock class offers an elegant solution that deals with read and write access to data by allowing any number of concurrent threads to read the data. It locks the data only when threads are updating the data. Reader threads can acquire the lock only if there are no writer threads holding the lock. Writer threads can acquire the lock only if there are no reader or writer threads holding the lock.

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With the template applied to the host object definition in Example 2-21, the resulting definition of the host object would include the inherited directives from the router_template template definition. You can see this actual definition in Example 2-22.

Note Permissions for creating, using, and managing views are covered later in the View Permissions

The third synchronization strategy concerns manual techniques. The .NET Framework provides a classic suite of techniques that give the programmer the ability to create and manage multithreaded applications using a low-level threading API (Application Programming Interface) similar to the WIN32 Threading API. The following table shows some of the classes in the System.Threading namespace that can be used for manual synchronization.

-u, --username user -p, --password password -j, --jserver server -t, --tls -h, --help, --usage -v, --verbose -d, --debug

section. If you are experiencing permission problems, refer to that section to clarify what privileges are necessary when working with views.

The AutoResetEvent class is used to make a thread wait until some event puts it in the signaled state by calling the Set() method. The AutoResetEvent is automatically reset to nonsignaled by the system after a single waiting thread has been released. If no threads are waiting, the event object s state remains signaled. The AutoResetEvent corresponds to a Win32 CreateEvent call, specifying False for the bManualReset argument. The ManualResetEvent class is also used to make a thread wait until some event puts it in the signaled state by calling the Set() method. The state of a ManualResetEvent object remains signaled until it is set explicitly to the nonsignaled state by the Reset() method. The ManualResetEvent corresponds to a Win32 CreateEvent call, specifying True for the bManualReset argument.

Overrides the user in the configuration file Overrides the password in the configuration file Overrides the server in the configuration file Uses SSL/TLS for connections Shows usage message Uses verbose output Shows debugging information

Let s break this statement down into each of the user-defined components to further explore how a view is created.

Mutex lock provides cross-process as well as cross-thread synchronization. The state of the Mutex is signaled if no thread owns it. Mutex doesn t have all the Wait and Pulse mechanism functionality of the Monitor class, however,

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