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<li class="level1"><a href="#topics">Topics:</a></li>
<li class="level1"><a href="#recommended-reading">Recommended Reading</a></li>
<li class="level1"><a href="#the-threading-classes">The Threading Classes</a></li>
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<h1 class="title">Thread Support in Qt</h1>
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<p>Qt provides thread support in the form of platform-independent threading classes, a thread-safe way of posting events, and signal-slot connections across threads. This makes it easy to develop portable multithreaded Qt applications and take advantage of multiprocessor machines. Multithreaded programming is also a useful paradigm for performing time-consuming operations without freezing the user interface of an application.</p>
<p>Earlier versions of Qt offered an option to build the library without thread support. Since Qt 4.0, threads are always enabled.</p>
<a name="topics"></a>
<h2>Topics:</h2>
<ul>
<li><a href="#recommended-reading">Recommended Reading</a></li>
<li><a href="#the-threading-classes">The Threading Classes</a></li>
<li><a href="threads-technologies.html">Multithreading Technologies in Qt</a></li>
<li><a href="threads-synchronizing.html">Synchronizing Threads</a></li>
<li><a href="threads-reentrancy.html">Reentrancy and Thread-Safety</a></li>
<li><a href="threads-qobject.html">Threads and QObjects</a></li>
<li><a href="threads-modules.html">Thread-Support in Qt Modules</a></li>
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<a name="recommended-reading"></a>
<h2>Recommended Reading</h2>
<p>This document is intended for an audience that has knowledge of, and experience with, multithreaded applications. If you are new to threading see our Recommended Reading list:</p>
<ul>
<li><a href="http://www.amazon.com/Threads-Primer-Guide-Multithreaded-Programming/dp/0134436989">Threads Primer: A Guide to Multithreaded Programming</a></li>
<li><a href="http://www.amazon.com/Thread-Time-MultiThreaded-Programming-Guide/dp/0131900676">Thread Time: The Multithreaded Programming Guide</a></li>
<li><a href="http://www.amazon.com/Pthreads-Programming-Standard-Multiprocessing-Nutshell/dp/1565921151a">Pthreads Programming: A POSIX Standard for Better Multiprocessing</a></li>
<li><a href="http://www.amazon.com/WIN32-Multithreaded-Programming-Aaron-Cohen/dp/1565922964">Win32 Multithreaded Programming</a></li>
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<h2>The Threading Classes</h2>
<p>These classes are relevant to threaded applications.</p>
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<tr class="odd topAlign"><td class="tblName"><p><a href="../qtconcurrent/qtconcurrent.html">QtConcurrent</a></p></td><td class="tblDescr"><p>The QtConcurrent namespace provides high-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtconcurrent/qtconcurrentfilter.html">Concurrent Filter and Filter-Reduce</a></p></td><td class="tblDescr"><p></p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtconcurrent/qtconcurrentmap.html">Concurrent Map and Map-Reduce</a></p></td><td class="tblDescr"><p></p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtconcurrent/qtconcurrentrun.html">Concurrent Run</a></p></td><td class="tblDescr"><p></p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qatomicinteger.html">QAtomicInteger</a></p></td><td class="tblDescr"><p>The QAtomicInteger class provides platform-independent atomic operations on integers.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qatomicpointer.html">QAtomicPointer</a></p></td><td class="tblDescr"><p>The QAtomicPointer class is a template class that provides platform-independent atomic operations on pointers.</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qfuture.html">QFuture</a></p></td><td class="tblDescr"><p>The QFuture class represents the result of an asynchronous computation.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qfuturesynchronizer.html">QFutureSynchronizer</a></p></td><td class="tblDescr"><p>The QFutureSynchronizer class is a convenience class that simplifies QFuture synchronization.</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qfuturewatcher.html">QFutureWatcher</a></p></td><td class="tblDescr"><p>The QFutureWatcher class allows monitoring a QFuture using signals and slots.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qmutex.html">QMutex</a></p></td><td class="tblDescr"><p>The QMutex class provides access serialization between threads.</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qmutexlocker.html">QMutexLocker</a></p></td><td class="tblDescr"><p>The QMutexLocker class is a convenience class that simplifies locking and unlocking mutexes.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qreadlocker.html">QReadLocker</a></p></td><td class="tblDescr"><p>The QReadLocker class is a convenience class that simplifies locking and unlocking read-write locks for read access.</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qreadwritelock.html">QReadWriteLock</a></p></td><td class="tblDescr"><p>The QReadWriteLock class provides read-write locking.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qwritelocker.html">QWriteLocker</a></p></td><td class="tblDescr"><p>The QWriteLocker class is a convenience class that simplifies locking and unlocking read-write locks for write access.</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qrunnable.html">QRunnable</a></p></td><td class="tblDescr"><p>The QRunnable class is the base class for all runnable objects.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qsemaphore.html">QSemaphore</a></p></td><td class="tblDescr"><p>The QSemaphore class provides a general counting semaphore.</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qthread.html">QThread</a></p></td><td class="tblDescr"><p>The QThread class provides a platform-independent way to manage threads.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qthreadpool.html">QThreadPool</a></p></td><td class="tblDescr"><p>The QThreadPool class manages a collection of QThreads.</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qthreadstorage.html">QThreadStorage</a></p></td><td class="tblDescr"><p>The QThreadStorage class provides per-thread data storage.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qwaitcondition.html">QWaitCondition</a></p></td><td class="tblDescr"><p>The QWaitCondition class provides a condition variable for synchronizing threads.</p></td></tr>
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<p><b>Note: </b>Qt's threading classes are implemented with native threading APIs; e.g., Win32 and pthreads. Therefore, they can be used with threads of the same native API.</p></div>
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