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// Copyright 2015 The Chromium Authors. All rights reserved.
// 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 <string>
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "base/values.h"
#include "cc/base/cc_export.h"
namespace base {
namespace trace_event {
class TracedValue;
}
class SingleThreadTaskRunner;
}
namespace cc {
class BlockingTaskRunner;
// Class responsible for controlling access to the main and impl task runners.
// Useful for assertion checks.
class CC_EXPORT TaskRunnerProvider {
public:
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();
BlockingTaskRunner* blocking_main_thread_task_runner() const {
return blocking_main_thread_task_runner_.get();
}
TaskRunnerProvider(
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
protected:
friend class DebugScopedSetImplThread;
friend class DebugScopedSetMainThread;
friend class DebugScopedSetMainThreadBlocked;
private:
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner_;
scoped_ptr<BlockingTaskRunner> blocking_main_thread_task_runner_;
#if DCHECK_IS_ON()
const base::PlatformThreadId main_thread_id_;
bool impl_thread_is_overridden_;
bool is_main_thread_blocked_;
#endif
DISALLOW_COPY_AND_ASSIGN(TaskRunnerProvider);
};
#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() {
DCHECK(task_runner_provider_->IsMainThreadBlocked());
task_runner_provider_->SetMainThreadBlocked(false);
}
private:
TaskRunnerProvider* task_runner_provider_;
DISALLOW_COPY_AND_ASSIGN(DebugScopedSetMainThreadBlocked);
};
#else
class DebugScopedSetMainThreadBlocked {
public:
explicit DebugScopedSetMainThreadBlocked(
TaskRunnerProvider* task_runner_provider) {}
~DebugScopedSetMainThreadBlocked() {}
private:
DISALLOW_COPY_AND_ASSIGN(DebugScopedSetMainThreadBlocked);
};
#endif
} // namespace cc
#endif // CC_TREES_TASK_RUNNER_PROVIDER_H_