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// Copyright 2014 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 IOS_WEB_WEB_THREAD_IMPL_H_
#define IOS_WEB_WEB_THREAD_IMPL_H_
#include "base/threading/thread.h"
#include "ios/web/public/web_thread.h"
namespace web {
class WebThreadDelegate;
class WebThreadImpl : public WebThread, public base::Thread {
public:
// Construct a WebThreadImpl with the supplied identifier. It is an error
// to construct a WebThreadImpl that already exists.
explicit WebThreadImpl(WebThread::ID identifier);
// Special constructor for the main (UI) thread and unittests. If a
// |message_loop| is provied, we use a dummy thread here since the main
// thread already exists.
WebThreadImpl(WebThread::ID identifier, base::MessageLoop* message_loop);
~WebThreadImpl() override;
static void ShutdownThreadPool();
// TODO(stuartmorgan): Move this to WebThread (where it belongs) once
// the alternate BrowserThread-backed-WebThread implementation goes away. See
// the note in web_thread_delegate.h.
//
// Sets the delegate for the specified WebThread.
//
// Only one delegate may be registered at a time. Delegates may be
// unregistered by providing a nullptr pointer.
//
// If the caller unregisters a delegate before CleanUp has been
// called, it must perform its own locking to ensure the delegate is
// not deleted while unregistering.
static void SetDelegate(ID identifier, WebThreadDelegate* delegate);
protected:
void Init() override;
void Run(base::MessageLoop* message_loop) override;
void CleanUp() override;
private:
// This class implements all the functionality of the public WebThread
// functions, but state is stored in the WebThreadImpl to keep
// the API cleaner. Therefore make WebThread a friend class.
friend class WebThread;
// The following are unique function names that makes it possible to tell
// the thread id from the callstack alone in crash dumps.
void UIThreadRun(base::MessageLoop* message_loop);
void DBThreadRun(base::MessageLoop* message_loop);
void FileThreadRun(base::MessageLoop* message_loop);
void FileUserBlockingThreadRun(base::MessageLoop* message_loop);
void CacheThreadRun(base::MessageLoop* message_loop);
void IOThreadRun(base::MessageLoop* message_loop);
static bool PostTaskHelper(WebThread::ID identifier,
const tracked_objects::Location& from_here,
const base::Closure& task,
base::TimeDelta delay,
bool nestable);
// Common initialization code for the constructors.
void Initialize();
// Performs cleanup that needs to happen on the IO thread before calling the
// embedder's CleanUp function.
void IOThreadPreCleanUp();
// For testing.
friend class TestWebThreadBundle;
friend class TestWebThreadBundleImpl;
static void FlushThreadPoolHelperForTesting();
// The identifier of this thread. Only one thread can exist with a given
// identifier at a given time.
ID identifier_;
};
} // namespace web
#endif // IOS_WEB_WEB_THREAD_IMPL_H_
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