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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/ipc/IdleSchedulerChild.h"
#include "mozilla/ipc/IdleSchedulerParent.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "mozilla/Atomics.h"
#include "mozilla/IdlePeriodState.h"
#include "BackgroundChild.h"
namespace mozilla {
namespace ipc {
static IdleSchedulerChild* sMainThreadIdleScheduler = nullptr;
IdleSchedulerChild::~IdleSchedulerChild() {
if (sMainThreadIdleScheduler == this) {
sMainThreadIdleScheduler = nullptr;
}
MOZ_ASSERT(!mIdlePeriodState);
}
void IdleSchedulerChild::Init(IdlePeriodState* aIdlePeriodState) {
mIdlePeriodState = aIdlePeriodState;
RefPtr<IdleSchedulerChild> scheduler = this;
auto resolve =
[&](Tuple<mozilla::Maybe<SharedMemoryHandle>, uint32_t>&& aResult) {
if (Get<0>(aResult)) {
mActiveCounter.SetHandle(*Get<0>(aResult), false);
mActiveCounter.Map(sizeof(int32_t));
mChildId = Get<1>(aResult);
if (mChildId && mIdlePeriodState && mIdlePeriodState->IsActive()) {
SetActive();
}
}
};
auto reject = [&](ResponseRejectReason) {};
SendInitForIdleUse(std::move(resolve), std::move(reject));
}
IPCResult IdleSchedulerChild::RecvIdleTime(uint64_t aId, TimeDuration aBudget) {
if (mIdlePeriodState) {
mIdlePeriodState->SetIdleToken(aId, aBudget);
}
return IPC_OK();
}
void IdleSchedulerChild::SetActive() {
if (mChildId && CanSend() && mActiveCounter.memory()) {
++(static_cast<Atomic<int32_t>*>(
mActiveCounter.memory())[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER]);
++(static_cast<Atomic<int32_t>*>(mActiveCounter.memory())[mChildId]);
}
}
bool IdleSchedulerChild::SetPaused() {
if (mChildId && CanSend() && mActiveCounter.memory()) {
--(static_cast<Atomic<int32_t>*>(mActiveCounter.memory())[mChildId]);
// The following expression reduces the global activity count and checks if
// it drops below the cpu counter limit.
return (static_cast<Atomic<int32_t>*>(
mActiveCounter
.memory())[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER])-- ==
static_cast<Atomic<int32_t>*>(
mActiveCounter.memory())[NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER];
}
return false;
}
IdleSchedulerChild* IdleSchedulerChild::GetMainThreadIdleScheduler() {
MOZ_ASSERT(NS_IsMainThread());
if (sMainThreadIdleScheduler) {
return sMainThreadIdleScheduler;
}
ipc::PBackgroundChild* background =
ipc::BackgroundChild::GetOrCreateForCurrentThread();
if (background) {
sMainThreadIdleScheduler = new ipc::IdleSchedulerChild();
background->SendPIdleSchedulerConstructor(sMainThreadIdleScheduler);
}
return sMainThreadIdleScheduler;
}
} // namespace ipc
} // namespace mozilla
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