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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 "APZThreadUtils.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/ProfilerRunnable.h"
#include "mozilla/StaticMutex.h"
#include "nsISerialEventTarget.h"
#include "nsThreadUtils.h"
#include "nsXULAppAPI.h"
namespace mozilla {
namespace layers {
static bool sThreadAssertionsEnabled = true;
static StaticRefPtr<nsISerialEventTarget> sControllerThread;
static StaticMutex sControllerThreadMutex MOZ_UNANNOTATED;
/*static*/
void APZThreadUtils::SetThreadAssertionsEnabled(bool aEnabled) {
StaticMutexAutoLock lock(sControllerThreadMutex);
sThreadAssertionsEnabled = aEnabled;
}
/*static*/
bool APZThreadUtils::GetThreadAssertionsEnabled() {
StaticMutexAutoLock lock(sControllerThreadMutex);
return sThreadAssertionsEnabled;
}
/*static*/
void APZThreadUtils::SetControllerThread(nsISerialEventTarget* aThread) {
// We must either be setting the initial controller thread, or removing it,
// or re-using an existing controller thread.
StaticMutexAutoLock lock(sControllerThreadMutex);
MOZ_ASSERT(!sControllerThread || !aThread || sControllerThread == aThread);
if (aThread != sControllerThread) {
// This can only happen once, on startup.
sControllerThread = aThread;
ClearOnShutdown(&sControllerThread);
}
}
/*static*/
void APZThreadUtils::AssertOnControllerThread() {
#if DEBUG
if (!GetThreadAssertionsEnabled()) {
return;
}
StaticMutexAutoLock lock(sControllerThreadMutex);
MOZ_ASSERT(sControllerThread && sControllerThread->IsOnCurrentThread());
#endif
}
/*static*/
void APZThreadUtils::RunOnControllerThread(RefPtr<Runnable>&& aTask,
uint32_t flags) {
RefPtr<nsISerialEventTarget> thread;
{
StaticMutexAutoLock lock(sControllerThreadMutex);
thread = sControllerThread;
}
RefPtr<Runnable> task = std::move(aTask);
if (!thread) {
// Could happen on startup or if Shutdown() got called.
NS_WARNING("Dropping task posted to controller thread");
return;
}
if (thread->IsOnCurrentThread()) {
AUTO_PROFILE_FOLLOWING_RUNNABLE(task);
task->Run();
} else {
thread->Dispatch(task.forget(), flags);
}
}
/*static*/
bool APZThreadUtils::IsControllerThread() {
StaticMutexAutoLock lock(sControllerThreadMutex);
return sControllerThread && sControllerThread->IsOnCurrentThread();
}
/*static*/
bool APZThreadUtils::IsControllerThreadAlive() {
StaticMutexAutoLock lock(sControllerThreadMutex);
return !!sControllerThread;
}
/*static*/
void APZThreadUtils::DelayedDispatch(already_AddRefed<Runnable> aRunnable,
int aDelayMs) {
MOZ_ASSERT(!XRE_IsContentProcess(),
"ContentProcessController should only be used remotely.");
RefPtr<nsISerialEventTarget> thread;
{
StaticMutexAutoLock lock(sControllerThreadMutex);
thread = sControllerThread;
}
if (!thread) {
// Could happen on startup
NS_WARNING("Dropping task posted to controller thread");
return;
}
if (aDelayMs) {
thread->DelayedDispatch(std::move(aRunnable), aDelayMs);
} else {
thread->Dispatch(std::move(aRunnable));
}
}
} // namespace layers
} // namespace mozilla
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