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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WorkerEventTarget.h"
#include "WorkerPrivate.h"
#include "WorkerRunnable.h"
#include "mozilla/dom/ReferrerInfo.h"
namespace mozilla::dom {
namespace {
class WrappedControlRunnable final : public WorkerControlRunnable {
nsCOMPtr<nsIRunnable> mInner;
~WrappedControlRunnable() = default;
public:
WrappedControlRunnable(WorkerPrivate* aWorkerPrivate,
nsCOMPtr<nsIRunnable>&& aInner)
: WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
mInner(std::move(aInner)) {}
virtual bool PreDispatch(WorkerPrivate* aWorkerPrivate) override {
// Silence bad assertions, this can be dispatched from any thread.
return true;
}
virtual void PostDispatch(WorkerPrivate* aWorkerPrivate,
bool aDispatchResult) override {
// Silence bad assertions, this can be dispatched from any thread.
}
bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
mInner->Run();
return true;
}
nsresult Cancel() override {
nsCOMPtr<nsICancelableRunnable> cr = do_QueryInterface(mInner);
// If the inner runnable is not cancellable, then just do the normal
// WorkerControlRunnable thing. This will end up calling Run().
if (!cr) {
WorkerControlRunnable::Cancel();
return NS_OK;
}
// Otherwise call the inner runnable's Cancel() and treat this like
// a WorkerRunnable cancel. We can't call WorkerControlRunnable::Cancel()
// in this case since that would result in both Run() and the inner
// Cancel() being called.
Unused << cr->Cancel();
return WorkerRunnable::Cancel();
}
};
} // anonymous namespace
NS_IMPL_ISUPPORTS(WorkerEventTarget, nsIEventTarget, nsISerialEventTarget)
WorkerEventTarget::WorkerEventTarget(WorkerPrivate* aWorkerPrivate,
Behavior aBehavior)
: mMutex("WorkerEventTarget"),
mWorkerPrivate(aWorkerPrivate),
mBehavior(aBehavior) {
MOZ_DIAGNOSTIC_ASSERT(mWorkerPrivate);
}
void WorkerEventTarget::ForgetWorkerPrivate(WorkerPrivate* aWorkerPrivate) {
MutexAutoLock lock(mMutex);
MOZ_DIAGNOSTIC_ASSERT(!mWorkerPrivate || mWorkerPrivate == aWorkerPrivate);
mWorkerPrivate = nullptr;
}
NS_IMETHODIMP
WorkerEventTarget::DispatchFromScript(nsIRunnable* aRunnable, uint32_t aFlags) {
nsCOMPtr<nsIRunnable> runnable(aRunnable);
return Dispatch(runnable.forget(), aFlags);
}
NS_IMETHODIMP
WorkerEventTarget::Dispatch(already_AddRefed<nsIRunnable> aRunnable,
uint32_t aFlags) {
nsCOMPtr<nsIRunnable> runnable(aRunnable);
MutexAutoLock lock(mMutex);
if (!mWorkerPrivate) {
return NS_ERROR_FAILURE;
}
if (mBehavior == Behavior::Hybrid) {
RefPtr<WorkerRunnable> r =
mWorkerPrivate->MaybeWrapAsWorkerRunnable(runnable.forget());
if (r->Dispatch()) {
return NS_OK;
}
runnable = std::move(r);
}
RefPtr<WorkerControlRunnable> r =
new WrappedControlRunnable(mWorkerPrivate, std::move(runnable));
if (!r->Dispatch()) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
NS_IMETHODIMP
WorkerEventTarget::DelayedDispatch(already_AddRefed<nsIRunnable>, uint32_t) {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
WorkerEventTarget::RegisterShutdownTask(nsITargetShutdownTask* aTask) {
NS_ENSURE_ARG(aTask);
MutexAutoLock lock(mMutex);
// If mWorkerPrivate is gone, the event target is already late during
// shutdown, return NS_ERROR_UNEXPECTED as documented in `nsIEventTarget.idl`.
if (!mWorkerPrivate) {
return NS_ERROR_UNEXPECTED;
}
return mWorkerPrivate->RegisterShutdownTask(aTask);
}
NS_IMETHODIMP
WorkerEventTarget::UnregisterShutdownTask(nsITargetShutdownTask* aTask) {
NS_ENSURE_ARG(aTask);
MutexAutoLock lock(mMutex);
if (!mWorkerPrivate) {
return NS_ERROR_UNEXPECTED;
}
return mWorkerPrivate->UnregisterShutdownTask(aTask);
}
NS_IMETHODIMP_(bool)
WorkerEventTarget::IsOnCurrentThreadInfallible() {
MutexAutoLock lock(mMutex);
if (!mWorkerPrivate) {
return false;
}
return mWorkerPrivate->IsOnCurrentThread();
}
NS_IMETHODIMP
WorkerEventTarget::IsOnCurrentThread(bool* aIsOnCurrentThread) {
MOZ_ASSERT(aIsOnCurrentThread);
*aIsOnCurrentThread = IsOnCurrentThreadInfallible();
return NS_OK;
}
} // namespace mozilla::dom
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