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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=4 et :
* 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 "FunctionBrokerChild.h"
#include "FunctionBrokerThread.h"
#include "mozilla/ipc/Endpoint.h"
namespace mozilla::plugins {
FunctionBrokerChild* FunctionBrokerChild::sInstance = nullptr;
bool FunctionBrokerChild::IsDispatchThread() { return mThread->IsOnThread(); }
void FunctionBrokerChild::PostToDispatchThread(
already_AddRefed<nsIRunnable>&& runnable) {
mThread->Dispatch(std::move(runnable));
}
/* static */
bool FunctionBrokerChild::Initialize(
Endpoint<PFunctionBrokerChild>&& aBrokerEndpoint) {
MOZ_RELEASE_ASSERT(
XRE_IsPluginProcess(),
"FunctionBrokerChild can only be used in plugin processes");
MOZ_ASSERT(!sInstance);
FunctionBrokerThread* thread = FunctionBrokerThread::Create();
if (!thread) {
return false;
}
sInstance = new FunctionBrokerChild(thread, std::move(aBrokerEndpoint));
return true;
}
/* static */
FunctionBrokerChild* FunctionBrokerChild::GetInstance() {
MOZ_RELEASE_ASSERT(
XRE_IsPluginProcess(),
"FunctionBrokerChild can only be used in plugin processes");
MOZ_ASSERT(sInstance, "Must initialize FunctionBrokerChild before using it");
return sInstance;
}
FunctionBrokerChild::FunctionBrokerChild(
FunctionBrokerThread* aThread, Endpoint<PFunctionBrokerChild>&& aEndpoint)
: mThread(aThread),
mShutdownDone(false),
mMonitor("FunctionBrokerChild Lock") {
MOZ_ASSERT(aThread);
PostToDispatchThread(
NewNonOwningRunnableMethod<Endpoint<PFunctionBrokerChild>&&>(
"FunctionBrokerChild::Bind", this, &FunctionBrokerChild::Bind,
std::move(aEndpoint)));
}
void FunctionBrokerChild::Bind(Endpoint<PFunctionBrokerChild>&& aEndpoint) {
MOZ_RELEASE_ASSERT(mThread->IsOnThread());
DebugOnly<bool> ok = aEndpoint.Bind(this);
MOZ_ASSERT(ok);
}
void FunctionBrokerChild::ShutdownOnDispatchThread() {
MOZ_ASSERT(mThread->IsOnThread());
// Set mShutdownDone and notify waiting thread (if any) that we are done.
MonitorAutoLock lock(mMonitor);
mShutdownDone = true;
mMonitor.Notify();
}
void FunctionBrokerChild::ActorDestroy(ActorDestroyReason aWhy) {
MOZ_ASSERT(mThread->IsOnThread());
// Queue up a task on the PD thread. When that task is executed then
// we know that anything queued before ActorDestroy has completed.
// At that point, we can set mShutdownDone and alert any waiting
// threads that it is safe to destroy us.
sInstance->PostToDispatchThread(NewNonOwningRunnableMethod(
"FunctionBrokerChild::ShutdownOnDispatchThread", sInstance,
&FunctionBrokerChild::ShutdownOnDispatchThread));
}
void FunctionBrokerChild::Destroy() {
MOZ_ASSERT(NS_IsMainThread());
if (!sInstance) {
return;
}
// mShutdownDone will tell us when ActorDestroy has been run and any tasks
// on the FunctionBrokerThread have completed. At that point, we can
// safely delete the actor.
{
MonitorAutoLock lock(sInstance->mMonitor);
while (!sInstance->mShutdownDone) {
// Release lock and wait. Regain lock when we are notified that
// we have ShutdownOnDispatchThread.
sInstance->mMonitor.Wait();
}
}
delete sInstance;
sInstance = nullptr;
}
} // namespace mozilla::plugins
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