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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 "mozilla/SchedulerGroup.h"
#include <utility>
#include "jsfriendapi.h"
#include "mozilla/Atomics.h"
#include "mozilla/Telemetry.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/DocGroup.h"
#include "mozilla/dom/ScriptSettings.h"
#include "nsINamed.h"
#include "nsQueryObject.h"
#include "nsThreadUtils.h"
using namespace mozilla;
/* static */
nsresult SchedulerGroup::UnlabeledDispatch(
TaskCategory aCategory, already_AddRefed<nsIRunnable>&& aRunnable) {
if (NS_IsMainThread()) {
return NS_DispatchToCurrentThread(std::move(aRunnable));
} else {
return NS_DispatchToMainThread(std::move(aRunnable));
}
}
/* static */
nsresult SchedulerGroup::Dispatch(TaskCategory aCategory,
already_AddRefed<nsIRunnable>&& aRunnable) {
return LabeledDispatch(aCategory, std::move(aRunnable), nullptr);
}
/* static */
nsresult SchedulerGroup::LabeledDispatch(
TaskCategory aCategory, already_AddRefed<nsIRunnable>&& aRunnable,
mozilla::PerformanceCounter* aPerformanceCounter) {
nsCOMPtr<nsIRunnable> runnable(aRunnable);
if (XRE_IsContentProcess()) {
RefPtr<Runnable> internalRunnable =
new Runnable(runnable.forget(), aPerformanceCounter);
return InternalUnlabeledDispatch(aCategory, internalRunnable.forget());
}
return UnlabeledDispatch(aCategory, runnable.forget());
}
/*static*/
nsresult SchedulerGroup::InternalUnlabeledDispatch(
TaskCategory aCategory, already_AddRefed<Runnable>&& aRunnable) {
if (NS_IsMainThread()) {
// NS_DispatchToCurrentThread will not leak the passed in runnable
// when it fails, so we don't need to do anything special.
return NS_DispatchToCurrentThread(std::move(aRunnable));
}
RefPtr<Runnable> runnable(aRunnable);
nsresult rv = NS_DispatchToMainThread(do_AddRef(runnable));
if (NS_FAILED(rv)) {
// Dispatch failed. This is a situation where we would have used
// NS_DispatchToMainThread rather than calling into the SchedulerGroup
// machinery, and the caller would be expecting to leak the nsIRunnable
// originally passed in. But because we've had to wrap things up
// internally, we were going to leak the nsIRunnable *and* our Runnable
// wrapper. But there's no reason that we have to leak our Runnable
// wrapper; we can just leak the wrapped nsIRunnable, and let the caller
// take care of unleaking it if they need to.
Unused << runnable->mRunnable.forget().take();
nsrefcnt refcnt = runnable.get()->Release();
MOZ_RELEASE_ASSERT(refcnt == 1, "still holding an unexpected reference!");
}
return rv;
}
SchedulerGroup::Runnable::Runnable(
already_AddRefed<nsIRunnable>&& aRunnable,
mozilla::PerformanceCounter* aPerformanceCounter)
: mozilla::Runnable("SchedulerGroup::Runnable"),
mRunnable(std::move(aRunnable)),
mPerformanceCounter(aPerformanceCounter) {}
mozilla::PerformanceCounter* SchedulerGroup::Runnable::GetPerformanceCounter()
const {
return mPerformanceCounter;
}
#ifdef MOZ_COLLECTING_RUNNABLE_TELEMETRY
NS_IMETHODIMP
SchedulerGroup::Runnable::GetName(nsACString& aName) {
// Try to get a name from the underlying runnable.
nsCOMPtr<nsINamed> named = do_QueryInterface(mRunnable);
if (named) {
named->GetName(aName);
}
if (aName.IsEmpty()) {
aName.AssignLiteral("anonymous");
}
return NS_OK;
}
#endif
NS_IMETHODIMP
SchedulerGroup::Runnable::Run() {
MOZ_RELEASE_ASSERT(NS_IsMainThread());
// The runnable's destructor can have side effects, so try to execute it in
// the scope of the SchedulerGroup.
nsCOMPtr<nsIRunnable> runnable(std::move(mRunnable));
return runnable->Run();
}
NS_IMETHODIMP
SchedulerGroup::Runnable::GetPriority(uint32_t* aPriority) {
*aPriority = nsIRunnablePriority::PRIORITY_NORMAL;
nsCOMPtr<nsIRunnablePriority> runnablePrio = do_QueryInterface(mRunnable);
return runnablePrio ? runnablePrio->GetPriority(aPriority) : NS_OK;
}
NS_IMPL_ISUPPORTS_INHERITED(SchedulerGroup::Runnable, mozilla::Runnable,
nsIRunnablePriority, SchedulerGroup::Runnable)
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