cef/libcef/browser/thread_util.h

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5.3 KiB
C++

// Copyright (c) 2012 The Chromium Embedded Framework 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 CEF_LIBCEF_BROWSER_THREAD_UTIL_H_
#define CEF_LIBCEF_BROWSER_THREAD_UTIL_H_
#pragma once
#include "base/location.h"
#include "base/logging.h"
#include "base/task/thread_pool.h"
#include "base/threading/scoped_blocking_call.h"
#include "base/threading/thread_restrictions.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#define CEF_UIT content::BrowserThread::UI
#define CEF_IOT content::BrowserThread::IO
#define CEF_CURRENTLY_ON(id) content::BrowserThread::CurrentlyOn(id)
#define CEF_CURRENTLY_ON_UIT() CEF_CURRENTLY_ON(CEF_UIT)
#define CEF_CURRENTLY_ON_IOT() CEF_CURRENTLY_ON(CEF_IOT)
#define CEF_REQUIRE(id) DCHECK(CEF_CURRENTLY_ON(id))
#define CEF_REQUIRE_UIT() CEF_REQUIRE(CEF_UIT)
#define CEF_REQUIRE_IOT() CEF_REQUIRE(CEF_IOT)
#define CEF_REQUIRE_RETURN(id, var) \
if (!CEF_CURRENTLY_ON(id)) { \
NOTREACHED() << "called on invalid thread"; \
return var; \
}
#define CEF_REQUIRE_UIT_RETURN(var) CEF_REQUIRE_RETURN(CEF_UIT, var)
#define CEF_REQUIRE_IOT_RETURN(var) CEF_REQUIRE_RETURN(CEF_IOT, var)
#define CEF_REQUIRE_RETURN_VOID(id) \
if (!CEF_CURRENTLY_ON(id)) { \
NOTREACHED() << "called on invalid thread"; \
return; \
}
#define CEF_REQUIRE_UIT_RETURN_VOID() CEF_REQUIRE_RETURN_VOID(CEF_UIT)
#define CEF_REQUIRE_IOT_RETURN_VOID() CEF_REQUIRE_RETURN_VOID(CEF_IOT)
template <int id, std::enable_if_t<id == CEF_UIT, bool> = true>
auto CEF_TASK_RUNNER() {
return content::GetUIThreadTaskRunner({});
}
template <int id, std::enable_if_t<id == CEF_IOT, bool> = true>
auto CEF_TASK_RUNNER() {
return content::GetIOThreadTaskRunner({});
}
#define CEF_POST_TASK(id, task) CEF_TASK_RUNNER<id>()->PostTask(FROM_HERE, task)
#define CEF_POST_DELAYED_TASK(id, task, delay_ms) \
CEF_TASK_RUNNER<id>()->PostDelayedTask(FROM_HERE, task, \
base::Milliseconds(delay_ms))
// Post a blocking task with the specified |priority|. Tasks that have not
// started executing at shutdown will never run. However, any task that has
// already begun executing when shutdown is invoked will be allowed to continue
// and will block shutdown until completion.
// Tasks posted with this method are not guaranteed to run sequentially. Use
// base::CreateSequencedTaskRunner instead if sequence is important.
// Sequenced runners at various priorities that always execute all pending tasks
// before shutdown are available via CefTaskRunnerManager and exposed by the CEF
// API.
#define CEF_POST_BLOCKING_TASK(priority, task) \
base::ThreadPool::PostTask( \
FROM_HERE, \
{priority, base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN, \
base::MayBlock()}, \
task)
// Post a blocking task that affects UI or responsiveness of future user
// interactions. Do not use if an immediate response to a user interaction is
// expected.
#define CEF_POST_USER_VISIBLE_TASK(task) \
CEF_POST_BLOCKING_TASK(base::TaskPriority::USER_VISIBLE, task)
// Post a blocking task where the user won't notice if it takes an arbitrarily
// long time to complete.
#define CEF_POST_BACKGROUND_TASK(task) \
CEF_POST_BLOCKING_TASK(base::TaskPriority::BEST_EFFORT, task)
// Assert that blocking is allowed on the current thread.
#define CEF_REQUIRE_BLOCKING() \
base::ScopedBlockingCall scoped_blocking_call( \
FROM_HERE, base::BlockingType::WILL_BLOCK)
// Same as IMPLEMENT_REFCOUNTING() but using the specified Destructor.
#define IMPLEMENT_REFCOUNTING_EX(ClassName, Destructor) \
public: \
void AddRef() const override { \
ref_count_.AddRef(); \
} \
bool Release() const override { \
if (ref_count_.Release()) { \
Destructor::Destruct(this); \
return true; \
} \
return false; \
} \
bool HasOneRef() const override { \
return ref_count_.HasOneRef(); \
} \
bool HasAtLeastOneRef() const override { \
return ref_count_.HasAtLeastOneRef(); \
} \
\
private: \
CefRefCount ref_count_
#define IMPLEMENT_REFCOUNTING_DELETE_ON_UIT(ClassName) \
IMPLEMENT_REFCOUNTING_EX(ClassName, content::BrowserThread::DeleteOnUIThread)
#define IMPLEMENT_REFCOUNTING_DELETE_ON_IOT(ClassName) \
IMPLEMENT_REFCOUNTING_EX(ClassName, content::BrowserThread::DeleteOnIOThread)
#endif // CEF_LIBCEF_BROWSER_THREAD_UTIL_H_