Replace the current license disclaimer in files by
a SPDX-License-Identifier.
Files that have to be modified by hand are modified.
License files are organized under LICENSES directory.
Task-number: QTBUG-67283
Change-Id: Id880c92784c40f3bbde861c0d93f58151c18b9f1
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
The Q(Basic)Mutex fast paths are entirely inline in the caller, which
means we need to annotate its operations directly or TSAN doesn't know
what's going on. Also annotate QRecursiveMutex.
The tryLock code could be in principle simplified via a QScopeGuard
but I didn't want to make a central class like QMutex depend on it.
[ChangeLog][QtCore][QMutex] QMutex now has annotations for
ThreadSanitizer.
Change-Id: Ibb130404e63a5ec9bcef9675f9addd16a2c38b7f
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Still not complete. Just grepping for static and thread_local.
Task-number: QTBUG-100486
Change-Id: I90ca14e8db3a95590ecde5f89924cf6fcc9755a3
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Improve the docs for the recently added move operations.
Change-Id: Iae17f5289d30faab4aaaec14a27036f7a03129ab
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The class is similar to unique_lock in that it allows for unlocking
and relocking. Since the locked state is tracked by QMutexLocker itself,
it's trivial to make it movable.
[ChangeLog][QtCore][QMutexLocker] The class is now movable.
Change-Id: I534044f8024575e996c12efb2236761d493798a3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Windows 8 added this pair of functions that can be used to implement the
same functionality as we have on Linux. For ease of understanding, I'm
calling them "futex" on Windows too.
From Qt 6 our minimum platform is Windows 10 so we can use this
unconditionally.
Change-Id: Ifea6e497f11a461db432ffff1448c6806ecfc36c
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
And add an entry about the API changes to qt6-changed.qdoc.
Pick-to: 6.0
Task-number: QTBUG-89429
Change-Id: I146574acd3e4aa5ed6f1629fc68888f009472f19
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Threads that unlock and lock a mutex at the same time perform the following
operations:
Thread 1 Thread 2
-------- --------
QBasicMutex::lockInternal() QBasicMutex::unlockInternal()
d_ptr.testAndSetOrdered(..., d) d = d_ptr.loadAcquire()
d->waiters.loadRelaxed(); (1)
d->waiters.fetchAndAddRelease() (2)
d_ptr.testAndSetRelease(d, 0) (3)
d->derefWaiters() (4)
d->waiters.testAndSetRelaxed(...) (5)
if (d != d_ptr.loadAcquire()) (6)
d->wait()
The operation (1) isn't serialized with the operation (6) so its memory
effect may be observed before the effect of the operation (1). However,
if memory effects are observed in the following order: (6) -> (1) -> (2)
-> (3) -> (4) -> (5) then Thread 1 doesn't notice that Thread 2 updates
d_ptr and goes to sleep with d pointing to a stale object, this object
isn't reachable since d_ptr is zeroed so Thread 1 cannot be woken up.
The patch adds the "acquire" barrier into the operation (1) so that it
cannot be reordered with the operation (6).
Fixes: QTBUG-88247
Pick-to: 5.15 5.12
Change-Id: I1d0c405c0bf5080ec1815d351b9b4b75efeab21a
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Avoid creating a a d pointer for recursive mutexes.
Change-Id: I28af15a416ee17de346e2ea5b1442279d9d3e159
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
These classes should not inherit from each other
anymore in Qt 6. The reason is that this makes
the 95% case of using a non-recursive mutex
much slower than it has to be.
This way, QMutex can now inline the fast path
and be pretty much as fast as QBasicMutex is
in Qt 5. They actually use the same code paths
now. The main difference is that QMutex allows
calling tryLock() with a timeout, which that
is not allowed for QBasicMutex.
[ChangeLog][QtCore][QMutex] QMutex does not support
recursive locking anymore. Use QRecursiveMutex for that
purpose. QRecursiveMutex does not inherit QMutex anymore
in Qt 6.
Change-Id: I10f9bab6269a9181a2e9f534fb72ce65bc76d989
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Since we're going to split QMutex and QRecursiveMutex into
separate classes, make sure QMutexLocker is prepared for that.
Change-Id: Id5e9a955d1db7c8ee663dd3811ad6448dad0aeae
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
As directed by ### Qt 6 comment.
Task-number: QTBUG-85700
Change-Id: Iae4179b017840efe4902de2b1529cf7ec0606865
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
- QCborError: Classes cannot relate to header files; use \inheaderfile
instead and link to the class from header file documentation.
- QRecursiveMutex: QDoc doesn't allow shared documentation comments
for duplicating \fn docs between the base and deriving classes.
Remove the sharing, the function documentation is available under
'All Members' doc for QRecursiveMutex.
- QMultiMap: unite() and one overload of insert() were not recognized
because their definitions in the same header file interfered with
QDoc - use Q_CLANG_QDOC macro to comment them out, and tag \fn
comments to ensure that the function documentation is matched.
Change-Id: Ic96869904a72d92453e4ffa6901000147571969b
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Move away from using 0 as pointer literal.
Done using clang-tidy. This is not complete as
run-clang-tidy can't handle all of qtbase in one go.
Change-Id: I1076a21f32aac0dab078af6f175f7508145eece0
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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>
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>
In preparation of Qt6 move away from pre-C++11 macros.
Change-Id: I44126693c20c18eca5620caab4f7e746218e0ce3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Add it to configure.json and replace all occurrences of QT_NO_THREAD
with QT_CONFIG(thread). Add conditions for other features that depend
on thread support. Remove conditions where we can use the QMutex and
QThreadStorage stubs.
Change-Id: I284e5d794fda9a4c6f4a1ab29e55aa686272a0eb
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
clang required adding template clauses to a few \fn commands.
|| defined(Q_CLANG_QDOC) was also added in qmutex.h.
Change-Id: I7e61f460a8f8f15032094fb35c02f73721a5eb8a
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>
A QFreeList's MaxIndex is clearly meant to be the sum of its Sizes;
but the parentheses in MaxIndex - (16 - 128 - 1024) doesn't give the
same as without the parentheses. Noticed while reviewing a copy of
this code now used by QReadWriteLock (which has this fix).
Change-Id: I9f68171475b3c6edc18896056b5532183fee92b2
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
qcore_foundation.mm:
- Can't link to 'fromCGPoint()'
- Undocumented parameter 'point' in QPointF::fromCGPoint()
- Can't link to 'fromCGRect()'
- Undocumented parameter 'rect' in QRectF::fromCGRect()
- Can't link to 'fromCGSize()'
- Undocumented parameter 'size' in QSizeF::fromCGSize()
Change-Id: Ie48f04c7b990634f8c5a836100b1be7854848bb4
Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>
qmutex.h is updated to let clangqdoc document the threads case,
because the no-threads case is not interesting, and clang can
handle everything declared in qmutex.h. This change required
that a few minor qdoc errors be corrected in qmutex.cpp as well.
Change-Id: Icb4122f2179d6aad39dc68376498364820143297
Reviewed-by: Martin Smith <martin.smith@qt.io>
Add parentheses after function names, replace
is different -> differs
Change-Id: I6332db1d1650ed8d8320c5f20cd79d0bf1870e27
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
By templating on the <chrono> types and unconditionally using
duration_cast to coerce the duration into a milliseconds, we
allowed code such as
mutex.try_lock_for(10us)
to compile, which is misleading, since it's actually a zero-
timeout try_lock().
Feedback from the std-discussions mailing list is that the
wait_for functions should wait for _at least_ the duration
given, because that is the natural direction of variance
(tasks becoming ready to run might not get a CPU immediately,
causing delays), while an interface that documents to wait
_no more_ than the given duration is promising something it
cannot fulfill.
Fix by converting the given duration to the smallest number
of milliseconds not less than the original duration. If that
is not representable in an int, use INT_MAX, emulating the
effect of a spurious wakeup, which are allowed to happen if
the function returns false in that case.
In the above example, the try_lock_for call is now equivalent
to
mutex.tryLock(1);
The tryLock() docs state that the actual waiting time does
not exceed the given milliseconds, but fixing that is a
separate issue.
Change-Id: Id4cbbea0ecc6fd2f94bb5aef28a1658be3728e52
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Remove most type traits from qtypetraits.h, but keep the custom
implementation of is_signed/is_unsigned. This gets rid of
BSD-3 licensed code from Google in a public header (hugh!).
The custom implementations for is_signed/is_unsigned are kept
because the implementations in gcc's standard headers do not
work as we expect for enums - both is_signed and is_unsigned
always returns false there - see also
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59027
[ChangeLog][QtCore][General] Qt now relies on type traits from
the C++ standard library.
Change-Id: I3f2188b46949f04ca4482a6ac9afd3482103f0e1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
cf53aa21bf and 3aaa5d6b32
were reverted because of reconstruction in 5.7.
defineTest(qtConfTest_checkCompiler) in configure.pri is smart
enough to cover the case in a9474d1260.
DirectWrite: Fix advances being scaled to 0
Since 131eee5cd, the stretch of a font can be 0, meaning
"whatever the font provides". In combination with ec7fee96,
this would cause advances in the DirectWrite engine to be scaled to
0, causing the QRawFont test to fail.
Conflicts:
configure
mkspecs/features/uikit/device_destinations.sh
mkspecs/features/uikit/xcodebuild.mk
src/corelib/global/qglobal.cpp
src/corelib/global/qnamespace.qdoc
src/plugins/platforms/cocoa/qcocoamenuitem.h
src/plugins/platforms/windows/qwindowsservices.cpp
src/plugins/platformthemes/gtk3/qgtk3dialoghelpers.cpp
src/plugins/platforms/windows/qwindowsfontenginedirectwrite.cpp
src/widgets/kernel/qapplication.cpp
tests/auto/widgets/dialogs/qfiledialog/tst_qfiledialog.cpp
tests/auto/widgets/dialogs/qfiledialog2/tst_qfiledialog2.cpp
Change-Id: I4656d8133da7ee9fcc84ad3f1c7950f924432d1e
Since Qt 5.6.0, some applications such as Kate (built with clang, libc++
and libcxxrt) on FreeBSD occasionally crash with the following error
message on exit:
QMutex::lock(): sem_wait failure: Invalid argument
[or pthread_cond_wait in the 5.6 branch]
Investigation by Gleb Popov, Thiago Macieira and Olivier Goffart has
shown that this is caused by the fact that QDBusConnectionManager is a
Q_GLOBAL_STATIC (so it will be destroyed with all the other
Q_GLOBAL_STATICs in the reverse order of construction). In the
Q_COMPILER_THREADSAFE_STATICS case, freelist() also returns a
function-level static that is constructed on first use, so it may be
destroyed earlier than the QDBusConnectionManager object, making it
impossible to lock a contended mutex.
We now make freelist() return a global static, so that it is always
destroyed after QDBusConnectionManager and other function-static
variables.
Change-Id: I210fa7c18dbdf2345863da49141b9a85cffdef52
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Now QBasicMutex is Lockable and QMutex is TimedLockable, which means they can
be used in std::lock_guard, std::unique_lock, std::lock, etc.
[ChangeLog][QtCore][QMutex] QMutex now fully models the TimedLockable
concept by providing the try_lock, try_lock_for and try_lock_until
functions, therefore making it usable in Standard Library lock
management classes and functions.
Change-Id: I7c691481a5781a696701e1ab78186b5cefbd6a87
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
This is source- and binary-compatible, including the marking of the
existing function as noexcept.
[ChangeLog][QtCore][QMutex] Made the isRecursive() method be a const
function so that it can be called in const QMutex objects too.
Change-Id: Ifea6e497f11a461db432ffff1448bead97c08f92
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Not that we require it, but since The Qt Company did it for all files
they have copyright, even if they haven't touched the file in years
(especially not in 2016), I'm doing the same.
Change-Id: I7a9e11d7b64a4cc78e24ffff142b4c9d53039846
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
From Qt 5.7 -> LGPL v2.1 isn't an option anymore, see
http://blog.qt.io/blog/2016/01/13/new-agreement-with-the-kde-free-qt-foundation/
Updated license headers to use new LGPL header instead of LGPL21 one
(in those files which will be under LGPL v3)
Change-Id: I046ec3e47b1876cd7b4b0353a576b352e3a946d9
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
This memory allocation was introduced in
314c83c0c2. With a compiler without thread
safe statics support mutex.cpp use a function named freelist() to create
the global QFreeList object. it will be created when the first time it was
accessed, but will never be released. This patch use Q_DESTRUCTOR_FUNCTION
to delete this object.
Task-number: QTBUG-48359
Change-Id: I4e4716930930aa98630101a1f96de6a7672af9cb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Since Q_GLOBAL_STATIC might use QMutex and cause a stack overflow.
Task-number: QTBUG-47554
Change-Id: I4853c5e9b9168d4a417200e2a45a1bf9cb103a30
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Pierre Rossi <pierre.rossi@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Qt copyrights are now in The Qt Company, so we could update the source
code headers accordingly. In the same go we should also fix the links to
point to qt.io.
Outdated header.LGPL removed (use header.LGPL21 instead)
Old header.LGPL3 renamed to header.LGPL3-COMM to match actual licensing
combination. New header.LGPL-COMM taken in the use file which were
using old header.LGPL3 (src/plugins/platforms/android/extract.cpp)
Added new header.LGPL3 containing Commercial + LGPLv3 + GPLv2 license
combination
Change-Id: I6f49b819a8a20cc4f88b794a8f6726d975e8ffbe
Reviewed-by: Matti Paaso <matti.paaso@theqtcompany.com>
qdoc only see a fake QMutex class (the same as the one built in bootstrap)
But that fake QMutex had static member while the normal QMutex class
has non static member.
QMutexLocker::mutex is also a const function in the real QMutexLocker
Task-number: QTBUG-38522
Change-Id: I220434ffc6a9e990029f770e2536ecb55b4e2182
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>
This allows us to get the current value of the QMutex / QBasicMutex
after the testAndSet operation failed. It saves an extra load from
memory.
Change-Id: I4922a8b3df15e342b177b13f56cf4f1184314520
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Default values should have mark-up to denote that they are code.
This commit changes:
-"property is true" to "property is \c true".
-"Returns true" to "Returns \c true".
-"property is false" to "property is \c false".
-"returns true" to "returns \c true".
-"returns false" to "returns \c false".
src/3rdparty and non-documentation instances were ignored.
Task-number: QTBUG-33360
Change-Id: Ie87eaa57af947caa1230602b61c5c46292a4cf4e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
The read from 'owner' for comparison with 'self' in QRecursiveMutexPrivate::lock()
is not synchronized with the write to 'owner' in the same function further down,
and neither operation is atomic.
Fix by making 'owner' an atomic pointer.
Change-Id: I186b88575589da0dce5827a1e17ceb4ce599ed02
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
It is deprecated and clang is starting to warn about it.
Patch mostly generated by clang itself, with some careful grep
and sed for the platform-specific parts.
Change-Id: I8058e6db0f1b41b33a9e8f17a712739159982450
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
As described in the QTBUG-30872, there may be a race condition involving
3 threads fighting for a mutex. I am surprised it was not caught
before despite all the Q_ASSERT and the stress test in tst_qmutex.
We do not need to call store(0) because the unlocking thread will
eventually remove the BigNumber flag. And perhaps it even did it
already, and another thread has incremented waiters (hence the Q_ASSERT
is wrong)
Here is a paste of part of the description from the bug report:
---
many threads, one of them is ready to release mutex, while at least two other trying to acquire it
d->waiters is 0
Thread 1 release mutex in unlockInternal:
if (d->waiters.fetchAndAddRelease(-QMutexPrivate::BigNumber) == 0)
d->waiters is now -QMutexPrivate::BigNumber
Thread 2 try to acquire mutex in lockInternal:
old_waiters = d->waiters.load();
if (old_waiters == -QMutexPrivate::BigNumber) {
if (d_ptr.testAndSetAcquire(d, dummyLocked())) {
It acquire 'about to release mutex' by changing d to dummyLocked
Thread 1 continue release procedure:
d->derefWaiters(0);
d->waiters is now back to 0
Thread 3 try to acquire mutex in lockInternal:
while (!d->waiters.testAndSetRelaxed(old_waiters, old_waiters + 1));
d->waiters is now 1
Thread 2 continue its dummy lock:
d->waiters.store(0);
d->waiters is force to 0
Thread 3 continue wait procedure
but it realize that mutex was already unlocked so decrease back waiters
if (d != d_ptr.loadAcquire()) {
if (old_waiters != QMutexPrivate::BigNumber) {
d->waiters.deref();
d->waiters became negative value of -1
Neither thread need internal data so it is released back to pool
The waiters counter in released internal structure is still -1
---
Change-Id: I1b22555db764482775db6e64a8c9ffa9e1ab0cf6
Task-number: QTBUG-30872
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Lucie Gérard
Giuseppe D'Angelo
Marc Mutz
Nico Vertriest
Thiago Macieira
Lars Knoll
Alexander Kartashov
Volker Hilsheimer
Edward Welbourne
Topi Reinio
Sze Howe Koh
Allan Sandfeld Jensen
Marc Mutz
Ulf Hermann
Martin Smith
Liang Qi
Kai Koehne
Raphael Kubo da Costa
Jani Heikkinen
Olivier Goffart
jian liang
Matti Paaso
Jerome Pasion
Stephen Kelly
Sergio Ahumada