Where am I being an idiot here.
I’ve got a class which is supposed to let me call any number of functions on the message thread safely, only it crashes. Here’s the class:
class MultiAsyncUpdater AsyncUpdater
{
public:
void callOnMessageThread(std::function<void()> callback)
{
ScopedLock l(lock);
queue.push_back(std::move(callback));
triggerAsyncUpdate();
}
private:
void handleAsyncUpdate() override
{
lock.enter();
auto queueCopy = queue;
queue.clear();
lock.exit();
for (auto & func : queueCopy)
func();
}
CriticalSection lock;
std::vector<std::function<void()>> queue;
};
I’m using it like this:
class X
{
void backgroundThread()
{
asyncUpdater.callOnMessageThread([this](){ /* some lambda stuff that crashes */ });
//...
}
~X()
{
LC_ASSERT_THIS_IS_THE_MESSAGE_THREAD;
JCF_LOG_DESTRUCTOR;
}
MultiAsyncUpdater asyncUpdater;
};
Sometimes the AsyncUpdater inside MultiAsyncUpdater inside X is triggered after the deletion of X. How is this possible? What am I missing?
Looking inside AsyncUpdater::AsyncUpdaterMessage when it crashes I’ve got:
owner = 0x13a05408 {activeMessage={referencedObject=0xdddddddd
The Asyncupdater appears to have been deleted.
