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still important.
On Linux, Valgrind and Helgrind can help detect threading errors.
- The anatomy of QThread is quite interesting:
-
- \list
- \o QThread does not live in the new thread where \l{QThread::}{run()} is
- executed. It lives in the old thread.
- \o Most QThread methods are the thread's control interface and are meant to
- be called from the old thread. Do not move this interface to the newly
- created thread using \l{QObject::}{moveToThread()}; i.e., calling
- \l{QObject::moveToThread()}{moveToThread(this)} is regarded as bad
- practice.
- \o \l{QThread::}{exec()} and the static methods
- \l{QThread::}{usleep()}, \l{QThread::}{msleep()},
- \l{QThread::}{sleep()} are meant to be called from the newly created
- thread.
- \o Additional members defined in the QThread subclass are
- accessible by both threads. The developer is responsible for
- coordinating access. A typical strategy is to set the members before
- \l{QThread::}{start()} is called. Once the worker thread is running,
- the main thread should not touch the additional members anymore. After
- the worker has terminated, the main thread can access the additional
- members again. This is a convenient strategy for passing parameters to a
- thread before it is started as well as for collecting the result once it
- has terminated.
- \endlist
-
\section2 Using a Mutex to Protect the Integrity of Data
A mutex is an object that has \l{QMutex::}{lock()} and \l{QMutex::}{unlock()}