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Improve docs for QtFuture::Launch::Sync policy

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Updated QFuture docs to be more precise about QtFuture::Launch::Sync
policy.

Change-Id: Ic267c71f858e04a47ea1fc0996ea342d5eae7744
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
This commit is contained in:
Sona Kurazyan 2020-09-18 13:19:28 +02:00
parent c6d1e7ad38
commit 461b28c89d
1 changed files with 13 additions and 6 deletions
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19
src/corelib/thread/qfuture.qdoc
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@ -902,7 +902,9 @@
Represents execution policies for running a QFuture continuation.
\value Sync The continuation will be launched in the same thread in
which the parent has been executing.
which the parent has been executing, or in the thread where
the parent lives if the continuation is attached after the
parent has already finished.
\value Async The continuation will be launched in in a separate thread taken from
the global QThreadPool.
@ -961,8 +963,9 @@
Attaches a continuation to this future, allowing to chain multiple asynchronous
computations if desired. When the asynchronous computation represented by this
future finishes, \a function will be invoked in the same thread in which this
future has been running. A new QFuture representing the result of the continuation
is returned.
future has been running. If the continuation is attached after the parent has
already finished, it will be invoked in the thread where the parent lives. This
method returns a new QFuture representing the result of the continuation.
\note Use other overloads of this method if you need to launch the continuation in
a separate thread.
@ -1058,8 +1061,10 @@
Attaches a failure handler to this future, to handle any exceptions that may
have been generated. Returns a QFuture of the parent type. The handler will
be invoked only in case of an exception, in the same thread as the parent
future has been running. \a handler is a callable which takes either no argument
or one argument, to filter by specific error types similar to
future has been running. If the continuation is attached after the parent has
already finished, it will be invoked in the thread where the parent lives.
\a handler is a callable which takes either no argument or one argument, to
filter by specific error types similar to
\l {https://en.cppreference.com/w/cpp/language/try_catch} {catch} statement.
For example:
@ -1088,7 +1093,9 @@
Attaches a cancellation \a handler to this future, to be called when the future is
canceled. The \a handler is a callable which doesn't take any arguments. It will be
invoked in the same thread in which this future has been running.
invoked in the same thread in which this future has been running. If the continuation
is attached after the parent has already finished, it will be invoked in the thread
where the parent lives.
\sa then(), onFailed()
*/