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- // Copyright 2015 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.
- #include "base/threading/sequenced_task_runner_handle.h"
- #include <utility>
- #include "base/check_op.h"
- #include "base/lazy_instance.h"
- #include "base/threading/thread_local.h"
- namespace base {
- namespace {
- LazyInstance<ThreadLocalPointer<SequencedTaskRunnerHandle>>::Leaky
- sequenced_task_runner_tls = LAZY_INSTANCE_INITIALIZER;
- } // namespace
- // static
- const scoped_refptr<SequencedTaskRunner>& SequencedTaskRunnerHandle::Get() {
- const SequencedTaskRunnerHandle* current =
- sequenced_task_runner_tls.Pointer()->Get();
- CHECK(current)
- << "Error: This caller requires a sequenced context (i.e. the current "
- "task needs to run from a SequencedTaskRunner). If you're in a test "
- "refer to //docs/threading_and_tasks_testing.md.";
- return current->task_runner_;
- }
- // static
- bool SequencedTaskRunnerHandle::IsSet() {
- return !!sequenced_task_runner_tls.Pointer()->Get();
- }
- SequencedTaskRunnerHandle::SequencedTaskRunnerHandle(
- scoped_refptr<SequencedTaskRunner> task_runner)
- : task_runner_(std::move(task_runner)) {
- DCHECK(task_runner_->RunsTasksInCurrentSequence());
- DCHECK(!SequencedTaskRunnerHandle::IsSet());
- sequenced_task_runner_tls.Pointer()->Set(this);
- }
- SequencedTaskRunnerHandle::~SequencedTaskRunnerHandle() {
- DCHECK(task_runner_->RunsTasksInCurrentSequence());
- DCHECK_EQ(sequenced_task_runner_tls.Pointer()->Get(), this);
- sequenced_task_runner_tls.Pointer()->Set(nullptr);
- }
- } // namespace base
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