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54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
// Copyright 2019 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_SIMPLE_TASK_EXECUTOR_H_
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#define BASE_TASK_SIMPLE_TASK_EXECUTOR_H_
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#include "base/base_export.h"
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#include "base/task/task_executor.h"
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#include "build/build_config.h"
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namespace base {
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// A simple TaskExecutor with exactly one SingleThreadTaskRunner.
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// Must be instantiated and destroyed on the thread that runs tasks for the
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// SingleThreadTaskRunner.
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class BASE_EXPORT SimpleTaskExecutor : public TaskExecutor {
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public:
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explicit SimpleTaskExecutor(scoped_refptr<SingleThreadTaskRunner> task_queue);
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~SimpleTaskExecutor() override;
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bool PostDelayedTask(const Location& from_here,
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const TaskTraits& traits,
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OnceClosure task,
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TimeDelta delay) override;
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scoped_refptr<TaskRunner> CreateTaskRunner(const TaskTraits& traits) override;
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scoped_refptr<SequencedTaskRunner> CreateSequencedTaskRunner(
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const TaskTraits& traits) override;
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scoped_refptr<SingleThreadTaskRunner> CreateSingleThreadTaskRunner(
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const TaskTraits& traits,
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SingleThreadTaskRunnerThreadMode thread_mode) override;
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#if BUILDFLAG(IS_WIN)
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scoped_refptr<SingleThreadTaskRunner> CreateCOMSTATaskRunner(
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const TaskTraits& traits,
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SingleThreadTaskRunnerThreadMode thread_mode) override;
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#endif // BUILDFLAG(IS_WIN)
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private:
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const scoped_refptr<SingleThreadTaskRunner> task_queue_;
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// In tests there may already be a TaskExecutor registered for the thread, we
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// keep tack of the previous TaskExecutor and restored it upon destruction.
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TaskExecutor* const previous_task_executor_;
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};
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} // namespace base
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#endif // BASE_TASK_SIMPLE_TASK_EXECUTOR_H_
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