void TaskQueue::wakeThread() {
if (!_thread) {
_thread = new QThread();
_worker = new TaskQueueWorker(this);
_worker->moveToThread(_thread);
connect(this, SIGNAL(taskAdded()), _worker, SLOT(onTaskAdded()));
connect(_worker, SIGNAL(taskProcessed()), this, SLOT(onTaskProcessed()));
_thread->start();
}
if (_stopTimer) _stopTimer->stop();
emit taskAdded();
}
TaskId TaskQueue::addTask(TaskPtr task) {
{
QMutexLocker lock(&_tasksToProcessMutex);
_tasksToProcess.push_back(task);
}
if (!_thread) {
_thread = new QThread();
_worker = new TaskQueueWorker(this);
_worker->moveToThread(_thread);
connect(this, SIGNAL(taskAdded()), _worker, SLOT(onTaskAdded()));
connect(_worker, SIGNAL(taskProcessed()), this, SLOT(onTaskProcessed()));
_thread->start();
}
if (_stopTimer) _stopTimer->stop();
emit taskAdded();
return task->id();
}
void TaskQueueWorker::onTaskAdded() {
if (_inTaskAdded) return;
_inTaskAdded = true;
bool someTasksLeft = false;
do {
TaskPtr task;
{
QMutexLocker lock(&_queue->_tasksToProcessMutex);
if (!_queue->_tasksToProcess.isEmpty()) {
task = _queue->_tasksToProcess.front();
}
}
if (task) {
task->process();
bool emitTaskProcessed = false;
{
QMutexLocker lockToProcess(&_queue->_tasksToProcessMutex);
if (!_queue->_tasksToProcess.isEmpty() && _queue->_tasksToProcess.front() == task) {
_queue->_tasksToProcess.pop_front();
someTasksLeft = !_queue->_tasksToProcess.isEmpty();
QMutexLocker lockToFinish(&_queue->_tasksToFinishMutex);
emitTaskProcessed = _queue->_tasksToFinish.isEmpty();
_queue->_tasksToFinish.push_back(task);
}
}
if (emitTaskProcessed) {
emit taskProcessed();
}
}
QCoreApplication::processEvents();
} while (someTasksLeft && !thread()->isInterruptionRequested());
_inTaskAdded = false;
}
