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68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
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// Copyright 2018 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 BASE_TASK_SEQUENCE_MANAGER_ASSOCIATED_THREAD_ID_H_
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#define BASE_TASK_SEQUENCE_MANAGER_ASSOCIATED_THREAD_ID_H_
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#include <memory>
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "base/sequence_checker.h"
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#include "base/threading/platform_thread.h"
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#include "base/threading/thread_checker.h"
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namespace base {
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namespace sequence_manager {
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namespace internal {
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// TODO(eseckler): Make this owned by SequenceManager once the TaskQueue
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// refactor has happened (https://crbug.com/865411).
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struct BASE_EXPORT AssociatedThreadId
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: public base::RefCountedThreadSafe<AssociatedThreadId> {
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public:
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PlatformThreadId thread_id = kInvalidThreadId;
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// TODO(eseckler): Replace thread_checker with sequence_checker everywhere.
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THREAD_CHECKER(thread_checker);
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SEQUENCE_CHECKER(sequence_checker);
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static scoped_refptr<AssociatedThreadId> CreateUnbound() {
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return MakeRefCounted<AssociatedThreadId>();
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}
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static scoped_refptr<AssociatedThreadId> CreateBound() {
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auto associated_thread = MakeRefCounted<AssociatedThreadId>();
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associated_thread->BindToCurrentThread();
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return associated_thread;
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}
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// Rebind the associated thread to the current thread. This allows creating
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// the SequenceManager and TaskQueues on a different thread/sequence than the
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// one it will manage. Should only be called once.
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void BindToCurrentThread() {
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DCHECK_EQ(kInvalidThreadId, thread_id);
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thread_id = PlatformThread::CurrentId();
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// Rebind the thread and sequence checkers to the current thread/sequence.
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DETACH_FROM_THREAD(thread_checker);
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DCHECK_CALLED_ON_VALID_THREAD(thread_checker);
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DETACH_FROM_SEQUENCE(sequence_checker);
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker);
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}
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// TODO(eseckler): Add a method that checks that we are either bound already
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// or on the thread which created us and use it in any_thread() accessors.
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private:
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friend class base::RefCountedThreadSafe<AssociatedThreadId>;
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~AssociatedThreadId() = default;
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};
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} // namespace internal
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} // namespace sequence_manager
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} // namespace base
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#endif // BASE_TASK_SEQUENCE_MANAGER_ASSOCIATED_THREAD_ID_H_
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