virtual void performTask(ScriptExecutionContext *context)
{
ASSERT_WITH_SECURITY_IMPLICATION(context->isWorkerGlobalScope());
WorkerGlobalScope* workerGlobalScope = static_cast<WorkerGlobalScope*>(context);
// It's not safe to call clearScript until all the cleanup tasks posted by functions initiated by WorkerThreadShutdownStartTask have completed.
workerGlobalScope->clearScript();
}
void WorkerThread::stop()
{
// Mutex protection is necessary because stop() can be called before the context is fully created.
MutexLocker lock(m_threadCreationMutex);
// Ensure that tasks are being handled by thread event loop. If script execution weren't forbidden, a while(1) loop in JS could keep the thread alive forever.
if (m_workerGlobalScope) {
m_workerGlobalScope->script()->scheduleExecutionTermination();
#if ENABLE(SQL_DATABASE)
DatabaseManager::manager().interruptAllDatabasesForContext(m_workerGlobalScope.get());
#endif
m_runLoop.postTaskAndTerminate({ ScriptExecutionContext::Task::CleanupTask, [] (ScriptExecutionContext* context ) {
WorkerGlobalScope* workerGlobalScope = toWorkerGlobalScope(context);
#if ENABLE(SQL_DATABASE)
// FIXME: Should we stop the databases as part of stopActiveDOMObjects() below?
DatabaseTaskSynchronizer cleanupSync;
DatabaseManager::manager().stopDatabases(workerGlobalScope, &cleanupSync);
#endif
workerGlobalScope->stopActiveDOMObjects();
workerGlobalScope->notifyObserversOfStop();
// Event listeners would keep DOMWrapperWorld objects alive for too long. Also, they have references to JS objects,
// which become dangling once Heap is destroyed.
workerGlobalScope->removeAllEventListeners();
#if ENABLE(SQL_DATABASE)
// We wait for the database thread to clean up all its stuff so that we
// can do more stringent leak checks as we exit.
cleanupSync.waitForTaskCompletion();
#endif
// Stick a shutdown command at the end of the queue, so that we deal
// with all the cleanup tasks the databases post first.
workerGlobalScope->postTask({ ScriptExecutionContext::Task::CleanupTask, [] (ScriptExecutionContext* context) {
WorkerGlobalScope* workerGlobalScope = toWorkerGlobalScope(context);
// It's not safe to call clearScript until all the cleanup tasks posted by functions initiated by WorkerThreadShutdownStartTask have completed.
workerGlobalScope->clearScript();
} });
} });
return;
}
m_runLoop.terminate();
}