f62d1bf48e
This replaces: - base::Optional -> absl::optional - include "base/optional.h" -> include "third_party/abseil-cpp/absl/types/optional.h" - base::nullopt -> absl::nullopt - base::make_optional -> absl::make_optional Bug: 1202909 Change-Id: Ie9f37bcbf6115632a19f4d063387d07b3723926f Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2897246 Commit-Queue: Peter Kasting <pkasting@chromium.org> Reviewed-by: Peter Kasting <pkasting@chromium.org> Owners-Override: Peter Kasting <pkasting@chromium.org> Cr-Commit-Position: refs/heads/master@{#883270}
81 lines
3.1 KiB
C++
81 lines
3.1 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_THREAD_IMPL_H_
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#define CONTENT_BROWSER_BROWSER_THREAD_IMPL_H_
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#include "base/memory/scoped_refptr.h"
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#include "base/single_thread_task_runner.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_POSIX)
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#include "base/files/file_descriptor_watcher_posix.h"
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#include "third_party/abseil-cpp/absl/types/optional.h"
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#endif
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namespace content {
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class BrowserMainLoop;
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class BrowserProcessIOThread;
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class TestBrowserThread;
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// BrowserThreadImpl is a scoped object which maps a SingleThreadTaskRunner to a
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// BrowserThread::ID. On ~BrowserThreadImpl() that ID enters a SHUTDOWN state
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// (in which BrowserThread::IsThreadInitialized() returns false) but the mapping
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// isn't undone to avoid shutdown races (the task runner is free to stop
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// accepting tasks by then however).
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//
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// Very few users should use this directly. To mock BrowserThreads, tests should
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// use BrowserTaskEnvironment instead.
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class CONTENT_EXPORT BrowserThreadImpl : public BrowserThread {
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public:
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~BrowserThreadImpl();
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// Returns the thread name for |identifier|.
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static const char* GetThreadName(BrowserThread::ID identifier);
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// Resets globals for |identifier|. Used in tests to clear global state that
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// would otherwise leak to the next test. Globals are not otherwise fully
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// cleaned up in ~BrowserThreadImpl() as there are subtle differences between
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// UNINITIALIZED and SHUTDOWN state (e.g. globals.task_runners are kept around
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// on shutdown). Must be called after ~BrowserThreadImpl() for the given
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// |identifier|.
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static void ResetGlobalsForTesting(BrowserThread::ID identifier);
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// Exposed for BrowserTaskExecutor. Other code should use
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// GetUIThreadTaskRunner({/IO}).
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using BrowserThread::GetTaskRunnerForThread;
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private:
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// Restrict instantiation to BrowserProcessIOThread as it performs important
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// initialization that shouldn't be bypassed (except by BrowserMainLoop for
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// the main thread).
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friend class BrowserProcessIOThread;
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friend class BrowserMainLoop;
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// TestBrowserThread is also allowed to construct this when instantiating fake
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// threads.
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friend class TestBrowserThread;
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// Binds |identifier| to |task_runner| for the browser_thread.h API. This
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// needs to happen on the main thread before //content and embedders are
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// kicked off and enabled to invoke the BrowserThread API from other threads.
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BrowserThreadImpl(BrowserThread::ID identifier,
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scoped_refptr<base::SingleThreadTaskRunner> task_runner);
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// The identifier of this thread. Only one thread can exist with a given
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// identifier at a given time.
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ID identifier_;
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#if defined(OS_POSIX)
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// Allows usage of the FileDescriptorWatcher API on the UI thread.
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absl::optional<base::FileDescriptorWatcher> file_descriptor_watcher_;
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#endif
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};
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} // namespace content
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#endif // CONTENT_BROWSER_BROWSER_THREAD_IMPL_H_
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