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QmlProfiler: Avoid race conditions when loading or saving data

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We cannot assume that the model manager is still available when the
operation finishes. Also, accessing the QML model or the trace time
from the thread is dangerous.

Change-Id: I673c57c09490a0e3e2647f3197929eff1ce4ceb3
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>
This commit is contained in:
Ulf Hermann
2016-02-08 16:51:48 +01:00
parent 0dff03e6fe
commit 21d1f6161e
3 changed files with 46 additions and 32 deletions
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16
src/plugins/qmlprofiler/qmlprofilertracefile.cpp
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@@ -117,16 +117,13 @@ static QString qmlTypeAsString(Message message, RangeType rangeType)
QmlProfilerFileReader::QmlProfilerFileReader(QObject *parent) :
QObject(parent),
m_traceStart(-1),
m_traceEnd(-1),
m_future(0),
m_loadedFeatures(0)
{
}
void QmlProfilerFileReader::setQmlDataModel(QmlProfilerDataModel *dataModel)
{
m_qmlModel = dataModel;
}
void QmlProfilerFileReader::setFuture(QFutureInterface<void> *future)
{
m_future = future;
@@ -142,8 +139,6 @@ bool QmlProfilerFileReader::load(QIODevice *device)
QXmlStreamReader stream(device);
bool validVersion = true;
qint64 traceStart = -1;
qint64 traceEnd = -1;
while (validVersion && !stream.atEnd() && !stream.hasError()) {
if (isCanceled())
@@ -160,9 +155,9 @@ bool QmlProfilerFileReader::load(QIODevice *device)
else
validVersion = false;
if (attributes.hasAttribute(_("traceStart")))
traceStart = attributes.value(_("traceStart")).toLongLong();
m_traceStart = attributes.value(_("traceStart")).toLongLong();
if (attributes.hasAttribute(_("traceEnd")))
traceEnd = attributes.value(_("traceEnd")).toLongLong();
m_traceEnd = attributes.value(_("traceEnd")).toLongLong();
}
if (elementName == _("eventData")) {
@@ -190,8 +185,7 @@ bool QmlProfilerFileReader::load(QIODevice *device)
emit error(tr("Error while parsing trace data file: %1").arg(stream.errorString()));
return false;
} else {
m_qmlModel->setData(traceStart, qMax(traceStart, traceEnd), m_qmlEvents, m_ranges);
m_qmlModel->setNoteData(m_notes);
emit success();
return true;
}
}