| Commit message (Collapse) | Author | Age | Files | Lines |
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We can't use qt_scoped_lock/qt_unique_lock here, so port to
std::unique_lock and std::lock_guard for now.
This is in preparation of deprecating QMutexLocker in favor
of std::unique_lock and std::scoped_lock.
In QFutureInterface, change the return type of mutex() from
QMutex* to QMutex&, so we don't need to deref when passing
to std::lock_guard. We need to keep the old method around
for BC reasons, so the new one needs an artificial function
argument for disambiguation. This will vanish come Qt 6.
Change-Id: I1a0f0205952a249512ec2dbd3f0f48dd209b1636
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Conflicts:
mkspecs/win32-clang-msvc/qmake.conf
src/corelib/tools/qlist.h
src/gui/painting/qcompositionfunctions.cpp
src/gui/painting/qtriangulator_p.h
src/gui/text/qfontengine_p.h
src/network/kernel/qhostinfo_p.h
src/platformsupport/fontdatabases/freetype/qfontengine_ft.cpp
Done-With: Allan Sandfeld Jensen <allan.jensen@qt.io>
Change-Id: Ib8a0308cf77224c4fbdcf56778fdac4a43e37798
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Change-Id: I4c0fd501db974fb8339944b8df845336776d80a9
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The array of QAtomicPointer<QMutex> can be initialized using relaxed
stores of nullptr, since nullptr is the whole data. But once we store
an actual QMutex pointer in the array, we need to publish the indirect
data thus created. We did this, with testAndSetRelease(); what was
missing was a corresponding acquire fence on load, without which there
is no happens-before relationship between the writes performed by the
QMutex ctor and the reads performed by a subsequent mutex.lock(), say,
on the same data.
Fix by adding acquire fences to all loads. That includes the dtor,
since mutexes may have been created in different threads, and never
been imported into this_thread before the dtor is running.
As a drive-by, return a new'ed QMutex that was successfully installed
directly to the caller, without again going through a load-acquire.
Fixes: QTBUG-59164
Change-Id: Ia25d205b1127c8c4de0979cef997d1a88123c5c3
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 65b8f59e045bb41fef99b1a44f462115de65064a)
(cherry picked from commit da38f0d691d9d7eacfac5fbcbd47b887bd59bd39)
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If this function is called by multiple threads, more than one could
reach the mutex locking and call TlsAlloc(), but only the last one would
save the data. The others would be leaked and, worse, be used by those
other threads.
[ChangeLog][QtCore][QObject] Fixed a resource leak caused by a race
condition if multiple QObjects were created at the same time, for the
first time in an application, from multiple threads (implies threads not
started with QThread).
Fixes: QTBUG-77238
Change-Id: Ife213d861bb14c1787e1fffd15b63a5818bcc807
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
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Conflicts:
.qmake.conf
src/gui/painting/qdrawhelper.cpp
src/network/ssl/qsslsocket_openssl.cpp
src/widgets/styles/qstylesheetstyle.cpp
Change-Id: Ibe1cd40f46a823c9e5edbe0a3cd16be1e1686b17
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Now that QRecursiveMutex is getting split off of QMutex, QMutexLocker
will stop working on QRecursiveMutex once the split has been finalized
in Qt 6.
Even today, QMutexLocker contains casts from QBasicMutex to QMutex
that some reviewers are uncomfortable with. One way to carry
QMutexLocker forward is to template it on the mutex type, possibly
with aliases like QBasicMutexLocker and QRecursiveMutexLocker. C++17
code would then not require a port, thanks to CTAD.
But we have the problem now, and we can't template QMutexLocker in Qt 5.
The alternative is to look at std and realize that they have surpassed
QMutexLocker in expressiveness already. A scoped_lock cannot be
unlocked again, a unique_lock can be moved around. QMutexLocker
doesn't do either. The only "problem" is that the std lock classes are
already templates, but we can't, yet, rely on C++17 CTAD to make them
look as if they weren't.
So, prepare for a future with C++17 CTAD by writing factory functions,
qt_scoped_lock and qt_unique_lock, which will later port mechanically
to their C++17 equivalents (mostly).
The functions are added to a new private qlocking_p.h becauee we don't
want to make them public. These are for use in Qt's own implementation,
or for users that don't care about compatibility and will not mind them
to be removed once we depend on C++17. Originally, I planned to use
qmutex_p.h instead, but that header is not self-contained and causes
build errors when we started to include it into libraries other than
QtCore.
Regarding the return value of qt_scoped_lock: Ideally, we'd like to
return a std::scoped_lock, but two things stand in the way: First,
scoped_lock was only added in C++17 (we fall back to lock_guard if
scoped_lock is not available). Second, returning one from a function
requires C++17 guaranteed copy elision, because neither scoped_lock
not lock_guard have a copy ctor. In order for code not to come to
depend on a particular lock class, we return any of lock_guard,
unique_lock or scoped_guard, depending on what the compiler supports,
and therefore wrap the functions in the unnamed namespace to avoid
running into ODR if (private) headers are used from different projects
(autotests, e.g.). By the time we can drop them, however, qt_*_lock
will be semantically 100% identical to their replacements.
Port some initial users.
Change-Id: I2a208ef2a4a533ee8e675812273986460e6b4d00
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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These were hidden in !QT_CONFIG(thread) code. The irony!
This patch does not change the semantics of the operations. It
just makes the implicit operations explicit.
Any fixes or optimizations are left for follow-up patches, if any.
Change-Id: I014eb71745532dae2efe7963aa87321f61b1bd7a
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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Change-Id: Ic96e777491cc8d304be056a3476a4de4c4700a0f
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
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Also reduce the pool size from 131 to 17, and use QBasicMutex
instead of recursive ones.
Change-Id: I3bf0374cce5ff2c07427070aba6128a22c9b70e4
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
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Move the recursive mutex use case out of QMutex into a separate class,
unsurprisingly called QRecursiveMutex. As an immediate benefit, 90% of
the QMutex users now enjoy a constexpr QMutex ctor.
This change prepares for a real split in Qt 6, so that both use-cases
are no longer bundled up in one class.
[ChangeLog][QtCore][QMutex] Added QRecursiveMutex as a replacement of
QMutex(QMutex::Recursive).
Change-Id: I79b8724e8a8ee65e4bd0f06acd76103fe4197b8c
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
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The default stack size is too small on RTEMS.
Qt uses threads internally and there is no way to change their stack
size.
Change-Id: I94a42c7a70c745f0b50d7051d9320edfabd1e09e
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
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The array of QAtomicPointer<QMutex> can be initialized using relaxed
stores of nullptr, since nullptr is the whole data. But once we store
an actual QMutex pointer in the array, we need to publish the indirect
data thus created. We did this, with testAndSetRelease(); what was
missing was a corresponding acquire fence on load, without which there
is no happens-before relationship between the writes performed by the
QMutex ctor and the reads performed by a subsequent mutex.lock(), say,
on the same data.
Fix by adding acquire fences to all loads. That includes the dtor,
since mutexes may have been created in different threads, and never
been imported into this_thread before the dtor is running.
As a drive-by, return a new'ed QMutex that was successfully installed
directly to the caller, without again going through a load-acquire.
Change-Id: Ia25d205b1127c8c4de0979cef997d1a88123c5c3
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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The old code used the implicit conversions from QAtomicPointer<T> to T*
and vice versa. The semantics of these differ from the ones std::atomic
uses, so we're going to deprecate these, like we did for load() and
store(), too.
This patch fixex some users of these APIs before we deprecate them.
Change-Id: I0a88bb1c359392538bb64b511bfc62381a56a468
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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This reverts commit 79bdc7cf1daec75df59de9236599a9f24077511a.
We haven't ported every usages to loadRelaxed() / storeRelaxed() yet.
And warning as error is enabled in dev. We will revert this change
when new qt5 baseline got integrated.
Task-number: QTBUG-76611
Change-Id: I5b1f608fefbaca481311f376f22718f2c5047106
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@qt.io>
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Conflicts:
.qmake.conf
src/gui/painting/qdrawhelper.cpp
src/gui/text/qdistancefield.cpp
src/gui/text/qdistancefield_p.h
src/network/ssl/qsslsocket_openssl.cpp
src/plugins/platforms/android/qandroidinputcontext.cpp
src/widgets/styles/qstylesheetstyle.cpp
Done-With: Timur Pocheptsov <timur.pocheptsov@qt.io>
Change-Id: Ia7daad21f077ea889898f17734ec46303e71fe6b
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Set name for pthread instead of "name too long" for easier tracking.
Change-Id: Iab22cbeac01277e4dc1325399c7892de2e5bd551
Reviewed-by: Timo Aarnipuro <timo.aarnipuro@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Fixes: QTBUG-76305
Change-Id: I192a7f0bc2c15e532bc6d51c7e9c39561ae3436c
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@qt.io>
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Tell people to move to loadRelaxed() / storeRelaxed(), now that
we have them.
[ChangeLog][QtCore][QAtomicInteger] The load() / store() functions
have been deprecated in favor of loadRelaxed() / storeRelaxed().
[ChangeLog][QtCore][QAtomicPointer] The load() / store() functions
have been deprecated in favor of loadRelaxed() / storeRelaxed().
Change-Id: If7a31db2f90fce4a7605a2377067e86990646f48
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Semi-automated, just needed ~20 manual fixes:
$ find \( -iname \*.cpp -or -iname \*.h \) -exec perl -pe 's/(\.|->)load\(\)/$1loadRelaxed\(\)/g' -i \{\} +
$ find \( -iname \*.cpp -or -iname \*.h \) -exec perl -pe 's/(\.|->)store\(/$1storeRelaxed\(/g' -i \{\} +
It can be easily improved (e.g. for store check that there are no commas
after the opening parens). The most common offender is QLibrary::load,
and some code using std::atomic directly.
Change-Id: I07c38a3c8ed32c924ef4999e85c7e45cf48f0f6c
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
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Wait for the result at the target index if the future
is running and the iterator index is past the current
result count.
Determine if there is a result at the target index
after waitForResult() returns, and return -1/end if
not.
Also support decrementing the end iterator. In this
case wait for the future to finish in order to get
the final result count.
Task-number: QTBUG-59811
Change-Id: I8fcc711bab2e72c3c5196a55b794d25e18bb324d
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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Conflicts:
qmake/generators/makefile.cpp
qmake/generators/unix/unixmake2.cpp
src/corelib/thread/qthread_unix.cpp
tests/auto/corelib/tools/qsharedpointer/tst_qsharedpointer.cpp
Change-Id: I1df0d4ba20685de7f9300bf07458c13376493408
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navigator.hardwareConcurrency can be accessed from
the main thread only. Read and cache the value on
QCoreApplication initialization.
Change-Id: I731f7f356ce106c7107977783d4b763326af06b6
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>
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Plain load() / store() have already relaxed semantics. This
can be surprising -- std::atomic::load()/store() are actually
sequentially consistent -- and introduce a pain point
if someone wants to move from Qt atomics to std:: atomics.
So just add a suffix to the functions to clarify what's the
memory ordering involved with them.
The Ops::load / ::store are temporarily left in, because other
modules depends on them. We need to port those modules away,
then they can go (it's private API anyhow).
Similarly, not deprecating anything yet, except for marking
obsolete in the docs; there's a lot of code around using
load() / store() that needs to be ported first.
[ChangeLog][QtCore][QAtomicInteger] Added loadRelaxed() and
storeRelaxed(), to be used as replacements of load() / store().
[ChangeLog][QtCore][QAtomicPointer] Added loadRelaxed() and
storeRelaxed(), to be used as replacements of load() / store().
Change-Id: Iab0a78885050379e3740f0b039ba2bef28ce3bd2
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Change-Id: If2ecf440fda9270688be60273e57d4b765bbdec2
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
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... instead of qPrintable(), %s, and explicit qt_error_string().
Saves 2KiB in text size on optimized Linux AMD64 GCC 9.1 builds.
Change-Id: I98b6717da1ed1b678f01167d704a96f10da47966
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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TSAN does not understand the futex system call.
Now, in QMutex and QSemaphore usage, futex is always wrapped by
atomic operations that always do an acquire (before waiting) and
a release (before waking waiters). That alone realizes a
synchronizes-with, and since Qt uses std::atomics, TSAN knows
what's going on and does not complain.
But what if one uses futex directly, or we change the
algorithms, or introduce some other new synchronization
primitive somewhere? Luckily TSAN offers annotations for this
that we can use.
This patch annotates the main entry point for the futex syscall
with a pair of acquire/release semantics. A futex call
guarantees total ordering on the operations on the futex
word(s), whether the call succeeds or fails.
Change-Id: Ib80ff898c09fbb6fc73989247eb757bf70971a8a
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Change-Id: I006dfd0b7cfa3bda5e5ab01bcefa851f031dfe0e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Change-Id: Ib7c4fc52915b5e6c72b9aa262fb59f2a041dccd7
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Change-Id: I010a6322d12e038fdce247a58dfb05e204c2ff3b
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qatomic.h included qbasicatomic.h which included qatomic.h.
Due to a define in qbasicatomic.h, the definitions from QAtomic would
change depending on which was included first. Fortunately qbasicatomic
does not need qatomic.h so the include can be removed.
Change-Id: I086009f2e16a6e20b2b76fc6b3bf66a343414206
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Change-Id: If4974bbf0a166de244dd57cb71b05fa28bcc34ce
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Change-Id: Ia7328524f2cd9d5995ac8705f0fe0bf570b2e831
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This enables overriding the macro so that it translates
to 'None' in the Qt for Python context.
Change-Id: Ib3cecf57eeb0405a1929309b71e9f012a07f11cf
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>
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In preparation of Qt6 move away from pre-C++11 macros.
Change-Id: I44126693c20c18eca5620caab4f7e746218e0ce3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Diff generated by running clang-tidy's modernize-use-nullptr checker on
the CMake-based Qt version.
Skipping src/3rdparty, examples/, tests/
Change-Id: Ib182074e2e2fd52f63093f73b3e2e4c0cb7af188
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Change-Id: I056b658ffe9390dfcbe2787e2bddc7f4e9b389dd
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Conflicts:
src/network/access/http2/hpacktable_p.h
Change-Id: Ie0c296667dfdebba84f4858056a1ac80c24ee7df
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This allows QtDeclarative examples to build.
Change-Id: Icd20304f76f8ba15c94eaf01b9fcd7b151b16146
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
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Conflicts:
tests/auto/widgets/itemviews/qheaderview/tst_qheaderview.cpp
Added tests/auto/testlib/selftests/expected_crashes_5.txt to work
round the output of the crashes test (which exercises UB, see
QTBUG-73903) being truncated on one test platform.
Change-Id: I9cd3f2639b4e50c3c4513e14629a40bdca8f8273
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Replace null and '\c nullptr' with \nullptr in the documentation.
Change-Id: Ib9e0cfc2eb2830b213e6523773603d56180b0998
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
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[-Wclazy-incorrect-emit]
Change-Id: I32cf5db522dcb14bbe5151914624979929eeb52e
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
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Change-Id: Iad53d4f21263718b8ecf15fd2d1170d24c7b675d
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The timeout will never be larger than numeric_limits<quint64>::max(),
especially on platforms with 32-bit longs.
Instead, test if the timeout is exactly numeric_limits<unsigned long>::max(),
which matches the ULONG_MAX value which is documented
to indicate no timeout.
Change-Id: Ib663eddb5703797c50c04fd4eae60bd64f379d1c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
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Read the navigator.hardwareConcurrency property.
Task-number: QTBUG-64625
Change-Id: I2ad582b67e4b0ddac3e3c21febab55543b2e1d6d
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>
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Add a simple private QBasicMutexLocker class, and let the
QOrderedMutexLocker operate on a QBasicMutex.
This allows the compiler to inline more things when handling
connections and speeds up activate() a bit more.
without change with change
string based connect: 3621 3368
pointer based connect: 4341 3919
not connected: 433 437
disconnected: 551 538
Change-Id: If979337891178aaeb0b3340b6d4f68b6f86b0260
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
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Change-Id: Ied1194730e75a6f30839bbf5429aa2699230288e
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And take the opportunity to tell people not to sleep. It's always wrong.
Fixes: QTBUG-71757
Change-Id: I36203b7dac414e3eb9effffd1566b956dd05f32a
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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