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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_TREES_TASK_RUNNER_PROVIDER_H_
#define CC_TREES_TASK_RUNNER_PROVIDER_H_
#include <memory>
#include <string>
#include "base/check.h"
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/task/single_thread_task_runner.h"
#include "base/threading/platform_thread.h"
#include "cc/cc_export.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace cc {
// Class responsible for controlling access to the main and impl task runners.
// Useful for assertion checks.
class CC_EXPORT TaskRunnerProvider {
public:
static std::unique_ptr<TaskRunnerProvider> Create(
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner) {
return base::WrapUnique(
new TaskRunnerProvider(main_task_runner, impl_task_runner));
}
static std::unique_ptr<TaskRunnerProvider> CreateForDisplayTree(
scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
auto provider = Create(task_runner, task_runner);
provider->for_display_tree_ = true;
return provider;
}
TaskRunnerProvider(const TaskRunnerProvider&) = delete;
TaskRunnerProvider& operator=(const TaskRunnerProvider&) = delete;
// TODO(vmpstr): Should these return scoped_refptr to task runners? Many
// places turn them into scoped_refptrs. How many of them need to?
base::SingleThreadTaskRunner* MainThreadTaskRunner() const;
bool HasImplThread() const;
base::SingleThreadTaskRunner* ImplThreadTaskRunner() const;
// Debug hooks.
bool IsMainThread() const;
bool IsImplThread() const;
bool IsMainThreadBlocked() const;
#if DCHECK_IS_ON()
void SetMainThreadBlocked(bool is_main_thread_blocked);
void SetCurrentThreadIsImplThread(bool is_impl_thread);
#endif
virtual ~TaskRunnerProvider();
protected:
TaskRunnerProvider(
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
friend class DebugScopedSetImplThread;
friend class DebugScopedSetMainThread;
friend class DebugScopedSetMainThreadBlocked;
private:
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner_;
#if DCHECK_IS_ON()
const base::PlatformThreadId main_thread_id_;
bool impl_thread_is_overridden_;
bool is_main_thread_blocked_;
#endif
// For GPU-side display trees, TaskRunnerProvider treats the main thread as
// both the "main" thread and the "impl" thread to placate various assertions
// about which thread is doing what inside the layer tree. This is a
// sufficient adaptation since the display tree consists only of a manually
// driven LayerTreeHostImpl on a single thread with no Proxy or Scheduler.
bool for_display_tree_ = false;
};
#if DCHECK_IS_ON()
class DebugScopedSetMainThreadBlocked {
public:
explicit DebugScopedSetMainThreadBlocked(
TaskRunnerProvider* task_runner_provider)
: task_runner_provider_(task_runner_provider) {
DCHECK(!task_runner_provider_->IsMainThreadBlocked());
task_runner_provider_->SetMainThreadBlocked(true);
}
DebugScopedSetMainThreadBlocked(const DebugScopedSetMainThreadBlocked&) =
delete;
~DebugScopedSetMainThreadBlocked() {
DCHECK(task_runner_provider_->IsMainThreadBlocked());
task_runner_provider_->SetMainThreadBlocked(false);
}
DebugScopedSetMainThreadBlocked& operator=(
const DebugScopedSetMainThreadBlocked&) = delete;
private:
raw_ptr<TaskRunnerProvider> task_runner_provider_;
};
#else
class DebugScopedSetMainThreadBlocked {
public:
explicit DebugScopedSetMainThreadBlocked(
TaskRunnerProvider* task_runner_provider) {}
DebugScopedSetMainThreadBlocked(const DebugScopedSetMainThreadBlocked&) =
delete;
~DebugScopedSetMainThreadBlocked() {}
DebugScopedSetMainThreadBlocked& operator=(
const DebugScopedSetMainThreadBlocked&) = delete;
};
#endif
} // namespace cc
#endif // CC_TREES_TASK_RUNNER_PROVIDER_H_
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