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use QTimer to update plugins #1095

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merged 6 commits into from
Oct 15, 2021
Merged

use QTimer to update plugins #1095

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95fad0d
use QTimer to update plugins
jennuine Oct 7, 2021
dfabb5c
use invokeMethod for UpdatePlugins in transport thread
jennuine Oct 11, 2021
de2e098
BlockingQueuedConnection for UpdatePlugins in transport thread
jennuine Oct 12, 2021
5bd0107
More thread safety fixes
azeey Oct 13, 2021
7b01eca
Merge branch 'ign-gazebo3' of github.com:ignitionrobotics/ign-gazebo …
jennuine Oct 13, 2021
164faf0
removed jointsModel mutex
jennuine Oct 13, 2021
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30 changes: 4 additions & 26 deletions src/gui/GuiRunner.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -31,15 +31,9 @@ using namespace ignition;
using namespace gazebo;

/// \todo(anyone) Move to GuiRunner::Implementation when porting to v5
/// \brief Flag used to end the gUpdateThread.
static bool gRunning = false;

/// \brief Mutex to protect the plugin update.
static std::mutex gUpdateMutex;

/// \brief The plugin update thread..
static std::thread gUpdateThread;

/////////////////////////////////////////////////
GuiRunner::GuiRunner(const std::string &_worldName)
{
Expand All @@ -63,29 +57,13 @@ GuiRunner::GuiRunner(const std::string &_worldName)
this->RequestState();

// Periodically update the plugins
// \todo(anyone) Move the global variables to GuiRunner::Implementation on v5
gRunning = true;
gUpdateThread = std::thread([&]()
{
while (gRunning)
{
{
std::lock_guard<std::mutex> lock(gUpdateMutex);
this->UpdatePlugins();
}
// This is roughly a 30Hz update rate.
std::this_thread::sleep_for(std::chrono::milliseconds(33));
}
});
QPointer<QTimer> timer = new QTimer(this);
connect(timer, &QTimer::timeout, this, &GuiRunner::UpdatePlugins);
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timer->start(33);
}

/////////////////////////////////////////////////
GuiRunner::~GuiRunner()
{
gRunning = false;
if (gUpdateThread.joinable())
gUpdateThread.join();
}
GuiRunner::~GuiRunner() = default;

/////////////////////////////////////////////////
void GuiRunner::RequestState()
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8 changes: 6 additions & 2 deletions src/gui/plugins/component_inspector/ComponentInspector.cc
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Expand Up @@ -91,6 +91,9 @@ namespace ignition::gazebo

/// \brief Transport node for making command requests
public: transport::Node node;

/// \brief Mutex to protect componentsModel
public: QMutex mutex;
};
}

Expand Down Expand Up @@ -337,6 +340,8 @@ void ComponentInspector::Update(const UpdateInfo &,
if (this->dataPtr->paused)
return;

QMutexLocker locker(&this->dataPtr->mutex);

auto componentTypes = _ecm.ComponentTypes(this->dataPtr->entity);

// List all components
Expand Down Expand Up @@ -431,10 +436,9 @@ void ComponentInspector::Update(const UpdateInfo &,
// Add component to list
else
{
// TODO(louise) Blocking here is not the best idea
QMetaObject::invokeMethod(&this->dataPtr->componentsModel,
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If we the Update function is called from the Qt thread, I would think we shouldn't need to use invokeMethod

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I thought that as well but when I change this invokeMethod to be:

item = this->dataPtr->componentsModel.AddComponentType(typeId);

even after dfabb5c it seg faults here: https://github.com/ignitionrobotics/ign-gazebo/blob/95fad0d32e3c015bd377e76856fdd2c2129d033f/src/gui/plugins/component_inspector/ComponentInspector.cc#L648

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I tried that, but it didn't crash for me for rolling_shapes.sdf. Which world did you try it on?

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Changing QMetaObject::invokeMethod(&this->dataPtr->componentsModel, "RemoveComponentType",... to a regular functions seems to break functionality of the ComponentInspector even though it doesn't crash, so maybe it's better to leave it as is. It's using Qt::QueuedConnection, which I think means it's executed after the thread goes to sleep after calling all the UpdatePlugin functions. So the timing may be important to keep the functionality.

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I tried that, but it didn't crash for me for rolling_shapes.sdf. Which world did you try it on?

I tested shapes.sdf, the crash happens after you select one of the entities in the entity tree.

"AddComponentType",
Qt::BlockingQueuedConnection,
Qt::DirectConnection,
Q_RETURN_ARG(QStandardItem *, item),
Q_ARG(ignition::gazebo::ComponentTypeId, typeId));
}
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8 changes: 6 additions & 2 deletions src/gui/plugins/joint_position_controller/JointPositionController.cc
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Expand Up @@ -59,6 +59,9 @@ namespace ignition::gazebo::gui

/// \brief Whether the initial model set from XML has been setup.
public: bool xmlModelInitialized{false};

/// \brief Mutex to protect jointsModel
public: QMutex mutex;
};
}

Expand Down Expand Up @@ -178,6 +181,8 @@ void JointPositionController::Update(const UpdateInfo &,
{
IGN_PROFILE("JointPositionController::Update");

QMutexLocker locker(&this->dataPtr->mutex);

if (!this->dataPtr->xmlModelInitialized)
{
auto entity = _ecm.EntityByComponents(
Expand Down Expand Up @@ -241,10 +246,9 @@ void JointPositionController::Update(const UpdateInfo &,
// Add joint to list
else
{
// TODO(louise) Blocking here is not the best idea
QMetaObject::invokeMethod(&this->dataPtr->jointsModel,
"AddJoint",
Qt::BlockingQueuedConnection,
Qt::DirectConnection,
Q_RETURN_ARG(QStandardItem *, item),
Q_ARG(Entity, jointEntity));
newItem = true;
Expand Down