Qt Signal Slots Across Threads
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.
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Qt Signal Slot Between Threads
Earlier versions of Qt offered an option to build the library without thread support. Since Qt 4.0, threads are always enabled.
Topics:
These articles assume that the reader has basic knowledge about multithreaded applications.
The Threading Classes
These classes are relevant to threaded applications.
High-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives |
Platform-independent atomic operations on integers |
Template class that provides platform-independent atomic operations on pointers |
Represents the result of an asynchronous computation |
Convenience class that simplifies QFuture synchronization |
Allows monitoring a QFuture using signals and slots |
Access serialization between threads |
Convenience class that simplifies locking and unlocking mutexes |
Convenience class that simplifies locking and unlocking read-write locks for read access |
Read-write locking |
Convenience class that simplifies locking and unlocking read-write locks for write access |
The base class for all runnable objects |
General counting semaphore |
Platform-independent way to manage threads |
Manages a collection of QThreads |
Per-thread data storage |
Condition variable for synchronizing threads |
Note: 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.
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