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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef mozilla_layers_APZThreadUtils_h
#define mozilla_layers_APZThreadUtils_h
#include "base/message_loop.h"
#include "nsITimer.h"
namespace mozilla {
class Runnable;
namespace layers {
class APZThreadUtils
{
public:
/**
* In the gtest environment everything runs on one thread, so we
* shouldn't assert that we're on a particular thread. This enables
* that behaviour.
*/
static void SetThreadAssertionsEnabled(bool aEnabled);
static bool GetThreadAssertionsEnabled();
/**
* Set the controller thread.
*/
static void SetControllerThread(MessageLoop* aLoop);
/**
* This can be used to assert that the current thread is the
* controller/UI thread (on which input events are received).
* This does nothing if thread assertions are disabled.
*/
static void AssertOnControllerThread();
/**
* This can be used to assert that the current thread is the
* compositor thread (which applies the async transform).
* This does nothing if thread assertions are disabled.
*/
static void AssertOnCompositorThread();
/**
* Run the given task on the APZ "controller thread" for this platform. If
* this function is called from the controller thread itself then the task is
* run immediately without getting queued.
*/
static void RunOnControllerThread(already_AddRefed<Runnable> aTask);
/**
* Returns true if currently on APZ "controller thread".
*/
static bool IsControllerThread();
};
// A base class for GenericTimerCallback<Function>.
// This is necessary because NS_IMPL_ISUPPORTS doesn't work for a class
// template.
class GenericTimerCallbackBase : public nsITimerCallback
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
protected:
virtual ~GenericTimerCallbackBase() {}
};
// An nsITimerCallback implementation that can be used with any function
// object that's callable with no arguments.
template <typename Function>
class GenericTimerCallback final : public GenericTimerCallbackBase
{
public:
explicit GenericTimerCallback(const Function& aFunction) : mFunction(aFunction) {}
NS_IMETHOD Notify(nsITimer*) override
{
mFunction();
return NS_OK;
}
private:
Function mFunction;
};
// Convenience function for constructing a GenericTimerCallback.
// Returns a raw pointer, suitable for passing directly as an argument to
// nsITimer::InitWithCallback(). The intention is to enable the following
// terse inline usage:
// timer->InitWithCallback(NewTimerCallback([](){ ... }), delay);
template <typename Function>
GenericTimerCallback<Function>* NewTimerCallback(const Function& aFunction)
{
return new GenericTimerCallback<Function>(aFunction);
}
} // namespace layers
} // namespace mozilla
#endif /* mozilla_layers_APZThreadUtils_h */
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