Thread Support in Qt

Qt 提供独立于平台的线程类, 线程安全的事件发布方式, 及跨线程的信号槽连接的形式. 这使得开发可移植的多线程 Qt 应用程序和利用多处理器机器变得容易. 多线程编程也是一种有用的范例, 可以在不阻塞应用程序用户界面的情况下执行耗时的操作.

Qt 的早期版本提供了在没有线程支持的情况下构建库的选项. 从 Qt 4.0 开始, 线程始终处于启用状态.

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下列文章假设读者具有有关多线程应用程序的基本知识.

下列类与线程相关.

Concurrent Filter and Filter-Reduce
Concurrent Map and Map-Reduce
Concurrent Run
QtConcurrent	High-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives
QAtomicInteger	Platform-independent atomic operations on integers
QAtomicPointer	Template class that provides platform-independent atomic operations on pointers
QFuture	Represents the result of an asynchronous computation
QFutureSynchronizer	Convenience class that simplifies QFuture synchronization
QFutureWatcher	Allows monitoring a QFuture using signals and slots
QMutex	Access serialization between threads
QMutexLocker	Convenience class that simplifies locking and unlocking mutexes
QReadLocker	Convenience class that simplifies locking and unlocking read-write locks for read access
QReadWriteLock	Read-write locking
QWriteLocker	Convenience class that simplifies locking and unlocking read-write locks for write access
QRunnable	The base class for all runnable objects
QSemaphore	General counting semaphore
QThread	Platform-independent way to manage threads
QThreadPool	Manages a collection of QThreads
QThreadStorage	Per-thread data storage
QWaitCondition	Condition variable for synchronizing threads

注意: Qt 的线程类是使用本地平台的线程 API 实现的; 如., Win32 和 pthreads. 因此, 它们可以与相同平台 API 的线程一起使用.