This test makes sure that we do not introduce a regression where the
threads exited the inner loop over the queue before the queue was
empty. This was triggered by calling tryTake at least maxThreadCount
times, which left the same number of null pointers in the queue
and caused the inner loop to exit too soon for all the threads.
Change-Id: I3a9d800149b88d09510ddc424667670b60f06a33
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
The issue was introduced by eaee1209f0, so
it affected only 5.9.2.
[ChangeLog][QtCore][QSemaphore] Fixed a regression that would make
tryAcquire() not to wait forever if the timeout was a negative
value. Note: new code is advised to only use -1 to indicate "forever",
as some other functions taking timeout periods do not accept other
values.
Task-number: QTBUG-64413
Change-Id: I57a1bd6e0c194530b732fffd14f58fce60d5dfc9
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
The vast majority is actually switched to QRandomGenerator::bounded(),
which gives a mostly uniform distribution over the [0, bound)
range. There are very few floating point cases left, as many of those
that did use floating point did not need to, after all. (I did leave
some that were too ugly for me to understand)
This commit also found a couple of calls to rand() instead of qrand().
This commit does not include changes to SSL code that continues to use
qrand() (job for someone else):
src/network/ssl/qsslkey_qt.cpp
src/network/ssl/qsslsocket_mac.cpp
tests/auto/network/ssl/qsslsocket/tst_qsslsocket.cpp
Change-Id: Icd0e0d4b27cb4e5eb892fffd14b5285d43f4afbf
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
<future> is needed by QThread::create. Instead of a fragile series
of preprocessor tests, move its detection to a configure test.
This dramatically simplifies the code, but on the other hand ties
the availability of QThread::create() to the system used to compile
Qt (rather the one used to compile an application).
Change-Id: If1b06363379bf29126cfa68f2a0651cbb78a67f7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
When many runnables are executed, this improves the
performance by not resizing the queue for each runnable,
which was the case in the previous version, because of
many calls to QVector::takeFirst().
Also add a test that makes sure tryTake() is safe to
call and does not leave the queue in a bad state that
tries to use nullptr entries.
Change-Id: I608134ecfa9cfc03db4878dcbd6f9c1107e13e90
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Remaining uses of Q_NULLPTR are in:
src/corelib/global/qcompilerdetection.h
(definition and documentation of Q_NULLPTR)
tests/manual/qcursor/qcursorhighdpi/main.cpp
(a test executable compilable both under Qt4 and Qt5)
Change-Id: If6b074d91486e9b784138f4514f5c6d072acda9a
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Remaining uses of Q_DECL_OVERRIDE are in:
src/corelib/global/qcompilerdetection.h
src/corelib/global/qglobal.cpp
doc/global/qt-cpp-defines.qdocconf
(definition and documentation of Q_DECL_OVERRIDE)
tests/manual/qcursor/qcursorhighdpi/main.cpp
(a test executable compilable both under Qt4 and Qt5)
Change-Id: Ib9b05d829add69e98a86238274b6a1fcb19b49ba
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Since MSVC doesn't have <chrono> (according to QT_HAS_INCLUDE), the QSKIP
in the test was printed for every line in the table. Instead, add the
skip in the _data() function.
Change-Id: I6e9274c1e7444ad48c81fffd14dbcee5e5a322aa
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Allows setting the stack size for the thread pool
worker threads. Implemented using QThread::stackSize.
Task-number: QTBUG-2568
Change-Id: Ic7f3981289290685195bbaee977a23e0c3c49bf0
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
Qemu uses some memory for each generated thread. This test creates
> 80000 threads and consumes about 10Gb of memory which is too
heavy for a VM.
Task-number: QTBUG-59966
Change-Id: I1bb8a0d7955778f5201948b41befcb9f1f391514
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
tryAcquireWithTimeout(0.2s) was already blacklisted and
now the same failed with "(2s)".
Task-number: QTBUG-58745
Change-Id: I82363238c08056d2969a7616e3a6e5af080d537d
Reviewed-by: Liang Qi <liang.qi@qt.io>
In the spirit of std::thread, which takes a function to call and its
parameters, and runs it in a new thread. Since the user might want to
connect to signals, move QObjects into the new thread, etc., the new
thread is not immediately started.
Although technically all of this _should_ be implementable in pure
C++11, there is nothing in the Standard to help us not reinvent all the
plumbing: packing the decay'd parameters, storing them, invoking the
function over the parameters (honoring INVOKE/std::invoke semantics).
std::function does not do the job, as it's copiable and therefore does
not support move-only functors; std::bind does not have INVOKE
semantics.
I certainly do not want to reimplement all the required facilities
inside of Qt. Therefore, the full blown implementation requires C++17
(std::invoke).
In order to make this useful also in pre-C++17, there are two additional
implementations (C++11 and C++14) that support just a callable, without
any arguments passed to it. The C++11 implementation makes use of a
class to store and call the callable (even move-only ones); basically,
it's what a closure type for a C++14 lambda would look like.
An alternative implementation could've used some of the existing
facilities inside QObject::connect implementation that store a functor
(for the connect() overload connecting to free functions), namely:
the QtPrivate::QFunctorSlotObject class. However:
* QFunctorSlotObject does not support move-only callables (see
QTBUG-60339);
* QFunctorSlotObject itself is not a callable (apparently by design),
and requires to be wrapped in a lambda that calls call() on it;
* the moment QTBUG-60339 is solved, we'd need the same handwritten
closure to keep QFunctorSlotObject working with move-only callabes.
So: just use the handwritten one.
The C++14 implementation is a simplified version of the C++11 one,
actually using a generalized lambda capture (corresponding to the
handwritten C++11 closure type).
All three implementations use std::async (with a deferred launch policy,
a nice use case for it!) under the hood. It's certainly an overkill for
our use case, as we don't need the std::future, but at least std::async
does all the plumbing for us.
[ChangeLog][QtCore][QThread] Added the QThread::create function.
Change-Id: I339d0be6f689df7d56766839baebda0aa2f7e94c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
If the respective modules aren't available we cannot build the tests
and examples. We drop the qtConfig(opengl) requirement for the opengl
examples as
a, we would need to make the QtGui configuration available for that to
work, and
b, we should not add too much detail to the tests and examples build
configurations. Checking each test and example for every feature it
uses would be too much.
Task-number: QTBUG-57255
Change-Id: Ifb043c81ec9e5c487765297bd65704812cd281fc
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
It has started failing recently on the CI, too.
Task-number: QTBUG-58745
Change-Id: I4c8834917e6455d00c300549ed448b06da75d5bc
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
Let's take the beginning of the description: WaitForSingleObjectEx can
be up to 16 milliseconds early. This is proven by the fact that there
are tests doing:
wait(waitTime);
QVERIFY(timer.elapsed() >= waitTime - systemTimersResolution);
and failing.
Task-number: QTBUG-59337
Change-Id: Iae839f6a131a4f0784bffffd14a9a79523d69d94
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
ResultStore never actually exists, only ResutStoreBase does. So casting to
ResultStore<T> and calling its member functions is UB. Put the type dependent
function as template member functions within ResultStoreBase and so we don't
need QtPrivate::ResultStore anymore.
Same goes for the iterator.
Change-Id: I739b9d234ba2238977863df77fde3a4471a9abd2
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Replace all QT_NO_PROCESS with QT_CONFIG(process), define it in
qconfig-bootstrapped.h, add QT_REQUIRE_CONFIG(process) to the qprocess
headers, exclude the sources from compilation when switched off, guard
header inclusions in places where compilation without QProcess seems
supported, drop some unused includes, and fix some tests that were
apparently designed to work with QT_NO_PROCESS but failed to.
Change-Id: Ieceea2504dea6fdf43b81c7c6b65c547b01b9714
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
The cancel() function added in 5b11e43e for Qt 5.5 suffers from a
number of problems:
First, if runnable->autoDelete() is true, then the function suffers
from the ABA problem (see documentation written for trytake()).
Second, if runnable->autoDelete() is false, due to cancel() throwing
away crucial information instead of returning it, the caller cannot
know whether the runnable was canceled (and thus has to be deleted),
wasn't found or is currently executing (and thus mustn't be deleted),
or has finished executing (and can be used to extract the result).
Deprecate this dangerous API and replace it with the much more useful
Private::stealRunnable(), promoted to public API and renamed to
tryTake() for consistency with the rest of Qt.
Described the various caveats in the function's documentation.
[ChangeLog][QtCore][QThreadPool] The cancel() function suffers from
several subtle issues and has been replaced with a new tryTake()
function.
Change-Id: I93125935614087efa24b3e3969dd6718aeabaa4f
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
We keep the runnables from finishing by having them block
on a QSemaphore::acquire() call inside run().
If we fail a test that precedes the call to sem.release()
further into the test, the early return will cause the
thread pool to be destroyed, which will then attempt to
wait for the runnables to finished, which, in turn wait
for the semaphore to be released.
-> dead lock
Fix by introducing a RAII object to release the semaphore
with a sufficiently large number to unblock all runnables.
That number will in some situations be too large, but that
does not matter.
Change-Id: I1ec7e29b37bc36309e93e6e30708cc7db3c9579c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
In order to get reproducible runs of the test, we need to
wait in the main thread until all runnables have started
executing. Otherwise, what the cancel() loop below actually
does will vary from run to run.
Change-Id: Ib912b0943e7bbd55c9480ae6fd4011ba20ac457e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Instead of allocating a statically-sized array on the heap,
use an automatic C array instead.
Replace some magic numbers with named constants.
Change-Id: I17d29a76a67c4a413453ac26a5dee8cd54a8a37d
Reviewed-by: David Faure <david.faure@kdab.com>
Manipulating a simple int from multiple threads is a data race,
thus undefined behavior.
Fix by using QAtomicInt and atomic operations instead.
Change-Id: I5418bc260da57fe353a71b8e5c7c1c97adbe7597
Reviewed-by: David Faure <david.faure@kdab.com>
When one of the QCOMPAREs in Consumer::run() fails, the consumer
returns early, leaving the producer deadlocked in a QSemaphore's
acquire() call. Change these to tryAcquire() with a large timeout,
so the producer, too, eventually leaves run().
Change-Id: I7421d43305decd4754e09c8e092363594d1be06b
Reviewed-by: David Faure <david.faure@kdab.com>
This test was determined to be flaky on the CI.
Task-number: QTBUG-58741
Change-Id: I43196d3a27f726fb96b427f5071e726b571a0404
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: David Faure <david.faure@kdab.com>
This is a simple RAII class that makes semaphore releasing
reliable in the face of exceptions and early returns.
This code originates from KDTools' KDSemaphoreReleaser[1], but
has been extensively reworked to support C++11 move semantics.
[1] https://docs.kdab.com/kdtools/2.3.0/class_k_d_semaphore_releaser.html
[ChangeLog][QtCore][QSemaphore] Added a new RAII class, QSemaphoreReleaser,
to reliably perform release() calls.
Change-Id: I6aff64d37cc0882b17c4419817bde60b542f34d9
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This test was determined to be flaky on the CI, depite attempts
to stabilize it (b750a3786f).
Task-number: QTBUG-58745
Change-Id: I933199cd537002699906147d172bb797f1dc90c1
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
