e840fc3ea0
This will enable the same scheduling capabilities as we already have on the UI thread. Bug: 863341 Change-Id: Ice34f614d78321caabf0fac3c6b1d6a621abb712 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1598813 Reviewed-by: Jochen Eisinger <jochen@chromium.org> Reviewed-by: Alex Clarke <alexclarke@chromium.org> Reviewed-by: Gabriel Charette <gab@chromium.org> Commit-Queue: Carlos Caballero <carlscab@google.com> Cr-Commit-Position: refs/heads/master@{#663539}
99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CONTENT_BROWSER_BROWSER_PROCESS_SUB_THREAD_H_
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#define CONTENT_BROWSER_BROWSER_PROCESS_SUB_THREAD_H_
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#include <memory>
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#include "base/macros.h"
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#include "base/threading/thread.h"
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#include "base/threading/thread_checker.h"
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#include "build/build_config.h"
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#include "content/common/content_export.h"
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#include "content/public/browser/browser_thread.h"
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#if defined(OS_WIN)
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namespace base {
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namespace win {
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class ScopedCOMInitializer;
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}
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}
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#endif
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namespace content {
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class NotificationService;
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}
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namespace content {
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// ----------------------------------------------------------------------------
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// A BrowserProcessSubThread is a physical thread backing a BrowserThread.
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//
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// Applications must initialize the COM library before they can call
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// COM library functions other than CoGetMalloc and memory allocation
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// functions, so this class initializes COM for those users.
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class CONTENT_EXPORT BrowserProcessSubThread : public base::Thread {
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public:
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// Constructs a BrowserProcessSubThread for |identifier|.
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explicit BrowserProcessSubThread(BrowserThread::ID identifier);
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~BrowserProcessSubThread() override;
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// Registers this thread to represent |identifier_| in the browser_thread.h
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// API. This thread must already be running when this is called. This can only
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// be called once per BrowserProcessSubThread instance.
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void RegisterAsBrowserThread();
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// Ideally there wouldn't be a special blanket allowance to block the
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// BrowserThreads in tests but TestBrowserThreadImpl previously bypassed
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// BrowserProcessSubThread and hence wasn't subject to ThreadRestrictions...
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// Flipping that around in favor of explicit scoped allowances would be
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// preferable but a non-trivial amount of work. Can only be called before
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// starting this BrowserProcessSubThread.
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void AllowBlockingForTesting();
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protected:
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void Init() override;
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void Run(base::RunLoop* run_loop) override;
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void CleanUp() override;
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private:
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// Second Init() phase that must happen on this thread but can only happen
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// after it's promoted to a BrowserThread in |RegisterAsBrowserThread()|.
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void CompleteInitializationOnBrowserThread();
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// These methods merely forwards to Thread::Run() but are useful to identify
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// which BrowserThread this represents in stack traces.
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void UIThreadRun(base::RunLoop* run_loop);
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void IOThreadRun(base::RunLoop* run_loop);
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// This method encapsulates cleanup that needs to happen on the IO thread.
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void IOThreadCleanUp();
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const BrowserThread::ID identifier_;
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// BrowserThreads are not allowed to do file I/O nor wait on synchronization
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// primivives except when explicitly allowed in tests.
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bool is_blocking_allowed_for_testing_ = false;
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// The BrowserThread registration for this |identifier_|, initialized in
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// RegisterAsBrowserThread().
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std::unique_ptr<BrowserThreadImpl> browser_thread_;
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#if defined (OS_WIN)
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std::unique_ptr<base::win::ScopedCOMInitializer> com_initializer_;
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#endif
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// Each specialized thread has its own notification service.
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std::unique_ptr<NotificationService> notification_service_;
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THREAD_CHECKER(browser_thread_checker_);
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DISALLOW_COPY_AND_ASSIGN(BrowserProcessSubThread);
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};
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} // namespace content
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#endif // CONTENT_BROWSER_BROWSER_PROCESS_SUB_THREAD_H_
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