qt5base-lts/tests/benchmarks/corelib/kernel
Kent Hansen d359b0af2b Call QObject::disconnectNotify() when receiver is destroyed
Store the signal index in QObjectPrivate::Connection, thereby making
it available in "implicit" disconnect contexts (i.e., receiver
deletion).

This change does not cause the size of QObjectPrivate::Connection
to grow (still 40 bytes on 32-bit Linux, 72 bytes on 64-bit Mac).

Valgrinding the new benchmark indicates that the percentage of the
time spent in the QObject destructor increased from 7.8% to 8.4%
on ia32, for that particular stress test; the increase is the
combined cost of calling metaObject(), QMetaObjectPrivate::signal(),
and disconnectNotify() for one connection. In practice, the measured
wallclock time increased by about 3ms for a 500ms run (which
repeatedly constructs, connects, and destroys an object).

Task-number: QTBUG-4844

Change-Id: I1beb01c753f31542fc0acb62edb4c6d165fcc5b4
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
2012-06-28 14:44:20 +02:00
..
events clean up qmake-generated projects 2012-02-24 05:18:30 +01:00
qcoreapplication clean up qmake-generated projects 2012-02-24 05:18:30 +01:00
qmetaobject Rename QMetaMethod::signature() to methodSignature() 2012-02-29 12:50:14 +01:00
qmetatype Fixed benchmarks to work from install directory 2012-03-19 01:18:20 +01:00
qobject Call QObject::disconnectNotify() when receiver is destroyed 2012-06-28 14:44:20 +02:00
qtimer_vs_qmetaobject Remove "All rights reserved" line from license headers. 2012-01-30 03:54:59 +01:00
qvariant remove some qmake -project boilerplate from project files 2012-06-19 16:39:52 +02:00
kernel.pro Change event posting to use a QVector. 2011-12-30 21:58:10 +01:00