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Fix segfault after deleting monitor

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The boost signal was sent synchronously, and so made the Qt signal to be posted
in FileMonitor::changed after the boost signal returned, so after the sender was
possibly destroyed.

The solution is to make the boost signal asynchronous using the Qt event loop.

Thanks to Scott Kostyshak for the report and MWE.

(cherry picked from commit 131f4b92ba)
This commit is contained in:
Guillaume MM 2018-11-13 23:10:35 +01:00 committed by Scott Kostyshak
parent 7950ace3d9
commit a8ad4002a0
3 changed files with 9 additions and 16 deletions
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1
src/insets/RenderPreview.cpp
View File

@ -304,6 +304,7 @@ void RenderMonitoredPreview::startMonitoring() const
{
if (!monitoring()) {
monitor_ = FileSystemWatcher::activeMonitor(filename_);
// Disconnected at the same time as this is destroyed.
monitor_->connect([this](bool /* exists */){ changed_(); });
}
}

17
src/support/FileMonitor.cpp
View File

@ -176,7 +176,14 @@ FileMonitor::FileMonitor(std::shared_ptr<FileMonitorGuard> monitor)
void FileMonitor::connectToFileMonitorGuard()
{
// Connections need to be asynchronous because the receiver can own this
// object and therefore is allowed to delete it.
// Qt signal:
QObject::connect(monitor_.get(), SIGNAL(fileChanged(bool)),
this, SIGNAL(fileChanged(bool)),
Qt::QueuedConnection);
// Boost signal:
QObject::connect(this, SIGNAL(fileChanged(bool)),
this, SLOT(changed(bool)));
}
@ -187,18 +194,10 @@ signals2::connection FileMonitor::connect(slot const & slot)
}
void FileMonitor::disconnect()
{
fileChanged_.disconnect_all_slots();
QObject::disconnect(this, SIGNAL(fileChanged(bool)));
}
void FileMonitor::changed(bool const exists)
{
// emit boost signal
fileChanged_(exists);
Q_EMIT fileChanged(exists);
}
@ -244,7 +243,7 @@ void ActiveFileMonitor::checkModified()
}
}
if (changed)
FileMonitor::changed(exists);
Q_EMIT FileMonitor::fileChanged(exists);
QTimer::singleShot(interval_, this, SLOT(clearCooldown()));
}

7
src/support/FileMonitor.h
View File

@ -60,10 +60,6 @@ typedef std::unique_ptr<ActiveFileMonitor> ActiveFileMonitorPtr;
/// monitor.connect(...);
/// (stops watching the first)
///
/// Reset connections:
/// monitor.disconnect();
/// or the disconnect method of the connection object for the boost signal.
///
class FileSystemWatcher
{
public:
@ -137,9 +133,6 @@ public:
typedef sig::slot_type slot;
/// Connect and you'll be informed when the file has changed.
signals2::connection connect(slot const &);
/// disconnect all slots connected to the boost signal fileChanged_ or to
/// the qt signal fileChanged()
void disconnect();
/// absolute path being tracked
std::string const & filename() { return monitor_->filename(); }
/// Make sure the good file is being monitored, after e.g. a move or a