Commit 10cb7abe authored by Eike Ziller's avatar Eike Ziller

Locator: Fix the fix of the deadlock

The all/current project searches use metacalls on the UI thread to work
around thread-unsafety of the Project::allFiles method, so we cannot jus
t block the UI thread to wait for the old search to cancel.
On the other hand, many of the ILocatorFilter::matchesFor implementation
s do not work when they are run in multiple threads simultaneously (most
implementations access unguarded member variables, help index filter tend
s to crash), so we _do_ have to wait for the search to cancel before sta
rting a new thread.
Broke with 05c26767 and 6fc39f0c

Change-Id: I93c607c879e8ba6ef60f94719812edb3df43a154
Task-number: QTCREATORBUG-12875
Task-number: QTCREATORBUG-12592
Reviewed-by: default avatarChristian Kandeler <>
parent a6014c10
......@@ -478,12 +478,18 @@ QList<ILocatorFilter *> LocatorWidget::filtersFor(const QString &text, QString &
void LocatorWidget::updateCompletionList(const QString &text)
m_updateRequested = true;
if (m_entriesWatcher->future().isRunning()) {
// Cancel the old future. We may not just block the UI thread to wait for the search to
// actually cancel, so try again when the finshed signal of the watcher ends up in
// updateEntries() (which will call updateCompletionList again with the
// requestedCompletionText)
m_requestedCompletionText = text;
QString searchText;
const QList<ILocatorFilter *> filters = filtersFor(text, searchText);
// cancel the old future
QFuture<LocatorFilterEntry> future = QtConcurrent::run(runSearch, filters, searchText);
......@@ -492,8 +498,9 @@ void LocatorWidget::updateEntries()
m_updateRequested = false;
if (m_entriesWatcher->future().isCanceled()) {
// reset to usable state
m_acceptRequested = false;
const QString text = m_requestedCompletionText;
......@@ -94,6 +94,7 @@ private:
QTimer *m_showPopupTimer;
QFutureWatcher<LocatorFilterEntry> *m_entriesWatcher;
QMap<Core::Id, QAction *> m_filterActionMap;
QString m_requestedCompletionText;
bool m_updateRequested;
bool m_acceptRequested;
bool m_possibleToolTipRequest;
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