| Commit message (Collapse) | Author | Age | Files | Lines |
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We could mark the cold path with __attribute__((cold)) (since GCC 4.3),
but quick tests locally indicate that the compiler is smart enough to
determine that by itself.
It will inline the hot path in _q_futex, which in turn is inlined in the
lockInternal and unlockInternal functions, whereas the cold path is kept
outside.
Change-Id: I8ae7d851d4f050498bfb491ba87d3e25453a14f8
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
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Unlocking a mutex can never throw an exception. That doesn't make
sense and our code should make sure it can't happen. Right now,
provided that the system-level functions don't throw, we don't either.
Locking a mutex cannot throw on Linux because we use futexes
directly. A non-recursive mutex is just a futex, whereas a recursive
mutex uses a mutex (a futex) to manage a lock count.
However, on other platforms, due to the freelist, there can be memory
allocation, which means it might throw std::bad_alloc. Not because of
the freelist itself (that uses malloc and will just crash if malloc
fails) but because of Q_GLOBAL_STATIC. In 5.1, the global static will
be noexcept provided the type's constructor is so too (it is, in this
case).
Change-Id: I4c562383f48de1be7827b9afb512d73eaf0792d5
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Even though we really shouldn't, we can get away with using __NR_futex instead.
Done-with: Thiago Macieira <thiago.macieira@intel.com>
Change-Id: I0ba449b740acf2c78825f8093d1515a74f0bc9cd
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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The timeout given in milliseconds should be converted to a timespec
struct.
To separate the seconds and nanoseconds the milliseconds are first
multiplied to represent the whole value in an int64 variable.
The calculation is done on integers, so we get an overflow if the
milliseconds are bigger then 2148.
If we cast the given value to an int64 we can avoid this problem.
Fix the used cast.
Task-number: QTBUG-24795
Change-Id: I864ae227cf7dda16a6f30aa4db74acc49e20f6eb
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
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Futexes on Linux can be used across processes, for inter-process
synchronisation. The private flag tells the kernel that this futex is
not used with other processes, so it does not need to check for waiters
outside the current process.
This feature had been proposed in Merge Request 25, but was lost.
Change-Id: Ieafa8b8df0949bd9ae73709b3ec63f7709b0b2a6
Reviewed-by: João Abecasis <joao.abecasis@nokia.com>
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As in the past, to avoid rewriting various autotests that contain
line-number information, an extra blank line has been inserted at the
end of the license text to ensure that this commit does not change the
total number of lines in the license header.
Change-Id: I311e001373776812699d6efc045b5f742890c689
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
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Replace Nokia contact email address with Qt Project website.
Change-Id: I431bbbf76d7c27d8b502f87947675c116994c415
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
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Change-Id: I02f2c620296fcd91d4967d58767ea33fc4e1e7dc
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
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QMutexPrivate takes more memory than necessary, and also initialize
platform specific ressources.
Change-Id: I70be1b89b1c21499645785ae47693a6b2514e28b
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
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Because we use d as a local variable.
We used this->d to refer it, but this can be confusing to have twice the same
name
Change-Id: I570aa5f444ada358eb456d6b3d9b8bfa60b10bbf
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
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Most of these changes are search-and-replace of d->ref ==, d->ref !=
and d->ref =.
The QBasicAtomicPointer in QObjectPrivate::Connection didn't need to
be basic, so I made it QAtomicPointer.
Change-Id: Ie3271abd1728af599f9ab17c6f4868e475f17bb6
Reviewed-on: http://codereview.qt-project.org/5030
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
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And added a POD QBasicMutex. (QBasicMutex* can safely be
static_cast'ed to QMutex*)
The d pointer is not anymore always a QMutexPrivate.
If d == 0x0: the mutex is unlocked
If d == 0x1: the mutex is locked, uncontended
On linux:
if d == 0x3: the mutex is locked contended, waiting on a futex
If d is a pointer, it is a recursive mutex.
On non-linux platforms:
When a thread tries to lock a mutex for which d == 0x1, it will try to
assing it a QMutexPrivated (allocated from a freelist) in order to wait
for it.
Change-Id: Ie1431cd9402a576fdd9a693cfd747166eebf5622
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
Reviewed-on: http://codereview.qt.nokia.com/2116
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Olivier Goffart <olivier.goffart@nokia.com>
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