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Using threading increases the complexity of your application, but offers performance gains. This is especially important as multiprocessor systems become more and more common. When developing multithreaded applications, you must make sure to not make any assumptions about timing or performance. You can never rely on things occurring in a certain order or at a certain pace. If you are aware of this, it is really easy to get started just inherit the QThread class and implement the run method. Shared resources are easily protected using the QMutex and QMutexLocker classes. If you mostly read from a value, a better choice is the QReadWriteLock combined with QReadLocker and QWriteLocker for better performance. For shared resources that you use in greater numbers than one, the QSemphore is your best choice.

txt: This file represents your entire documentation for the project Here s indextxt: . SimpleSite Documentation documentation master file, created by sphinx-quickstart on Thu Oct 2 14:16:47 2008 You can adapt this file completely to your liking, but it should at least contain the root `toctree` directive Welcome to SimpleSite Documentation's documentation! ==================================================== Contents: . toctree:: :maxdepth: 2 Indices and tables ================== * :ref:`genindex` * :ref:`modindex` * :ref:`search` Now that Sphinx is configured, let s build the documentation The sphinx-build command takes the source directory and output directory commands In this case, the source directory is the current directory (docs), and the output directory is a new subdirectory called build The -b html option tells Sphinx you want HTML output (the default) Run the command like this: $ sphinx-build -b html /build Sphinx v042, building html trying to load pickled env...

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not found building [html]: targets for 1 source files that are out of date updating environment: 1 added, 0 changed, 0 removed reading.. index pickling the env.. done checking consistency.. writing output.. index finishing.. writing additional files.. genindex modindex search copying static files.. dumping search index.. build succeeded..

Problems occasionally arose in Windows 98 in which a diagnostic mode is needed to deal with the issue. For example, if some device driver locks up while the computer is booting up,1 the Windows 98 diagnostic mode can be used to help determine which device drivers may be causing the problem. The Windows 98 diagnostic mode does not load up all device drivers at boot time. You can access the diagnostic mode in Windows 98 by pressing the F8 key while the operating system is booting up. Even if a computer is password protected, anyone can hit the F8 key at boot time, and the computer will jump into its diagnostic mode, giving the user the ability to access the hard disk and any sensitive data on it without entering a username or password. In Windows 98, the security feature of entering a username and password was added into the operating system as an afterthought, as opposed to being part of the initial design of the operating system. If instead the operating system was designed with security in mind, then it might ask a user to enter a username and password to even enter the diagnostic mode. The design of the Windows 98 password mechanism is an example of how adding security as an afterthought does not work.

When threading, you must ensure that QObject instances are kept to a single thread. You can access members of a QObject from a thread other than the thread in which the object was created. Just make sure to protect any shared data. Some QObject derivates are not meant for sharing at all: the networking classes, the entire database module, and the QProcess class. Graphical classes are even pickier they must be used from the main thread.

After the build has succeeded, the subdirectories .build, .static, and .templates will be present in the docs directory.

atabases are an integral part of even the simplest modern applications. While most readers might tend to relate databases to websites and large corporate solutions, you might be surprised to know that you can also use one to store data managed within a Qt application. Qt offers a module for relational databases called QtSql. SQL, which stands for structured query language, is a language used for manipulating relational databases. Using SQL, you can communicate between different database engines and your application. Qt supports many of the most popular databases, including MySQL, Oracle, PostgreSQL, Sybase, DB2, SQLite, Interbase, and ODBC. These drivers can be built as plugins or can be integrated in Qt. In this chapter you ll learn how to integrate both the MySQL and SQLite databases with your Qt applications. You might use MySQL in more sophisticated situations and use SQLite when a database is handy but a full-featured database server might be considered overkill.

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