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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/src/frameworks-technologies/threads.qdoc | 45 |
1 files changed, 29 insertions, 16 deletions
diff --git a/doc/src/frameworks-technologies/threads.qdoc b/doc/src/frameworks-technologies/threads.qdoc index 10da936..fd6bebb 100644 --- a/doc/src/frameworks-technologies/threads.qdoc +++ b/doc/src/frameworks-technologies/threads.qdoc @@ -472,24 +472,37 @@ \section1 Signals and Slots Across Threads - Qt supports three types of signal-slot connections: + Qt supports these signal-slot connection types: \list - \o With \l{Qt::DirectConnection}{direct connections}, the - slot gets called immediately when the signal is emitted. The - slot is executed in the thread that emitted the signal (which - is not necessarily the thread where the receiver object - lives). - - \o With \l{Qt::QueuedConnection}{queued connections}, the - slot is invoked when control returns to the event loop of the - thread to which the object belongs. The slot is executed in - the thread where the receiver object lives. - - \o With \l{Qt::AutoConnection}{auto connections} (the default), - the behavior is the same as with direct connections if - the signal is emitted in the thread where the receiver lives; - otherwise, the behavior is that of a queued connection. + + \o \l{Qt::AutoConnection}{Auto Connection} (default) The behavior + is the same as the Direct Connection, if the emitter and + receiver are in the same thread. The behavior is the same as + the Queued Connection, if the emitter and receiver are in + different threads. + + \o \l{Qt::DirectConnection}{Direct Connection} The slot is invoked + immediately, when the signal is emitted. The slot is executed + in the emitter's thread, which is not necessarily the + receiver's thread. + + \o \l{Qt::QueuedConnection}{Queued Connection} The slot is invoked + when control returns to the event loop of the receiver's + thread. The slot is executed in the receiver's thread. + + \o \l{Qt::BlockingQueuedConnection}{Blocking Queued Connection} + The slot is invoked as for the Queued Connection, except the + current thread blocks until the slot returns. \note Using this + type to connect objects in the same thread will cause deadlock. + + \o \l{Qt::UniqueConnection}{Unique Connection} The behavior is the + same as the Auto Connection, but the connection is made only if + it does not duplicate an existing connection. i.e., if the same + signal is already connected to the same slot for the same pair + of objects, then the connection is not made and connect() + returns false. + \endlist The connection type can be specified by passing an additional |