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75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
// Copyright 2016 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_TASK_SCHEDULER_TASK_TRACKER_POSIX_H_
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#define BASE_TASK_TASK_SCHEDULER_TASK_TRACKER_POSIX_H_
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#include <memory>
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#include "base/base_export.h"
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#include "base/logging.h"
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#include "base/macros.h"
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#include "base/task/task_scheduler/task_tracker.h"
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#include "base/threading/platform_thread.h"
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namespace base {
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class MessageLoopForIO;
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namespace internal {
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struct Task;
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// A TaskTracker that instantiates a FileDescriptorWatcher in the scope in which
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// a task runs. Used on all POSIX platforms except NaCl SFI.
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// set_watch_file_descriptor_message_loop() must be called before the
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// TaskTracker can run tasks.
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class BASE_EXPORT TaskTrackerPosix : public TaskTracker {
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public:
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TaskTrackerPosix(StringPiece name);
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~TaskTrackerPosix() override;
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// Sets the MessageLoopForIO with which to setup FileDescriptorWatcher in the
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// scope in which tasks run. Must be called before starting to run tasks.
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// External synchronization is required between a call to this and a call to
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// RunTask().
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void set_watch_file_descriptor_message_loop(
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MessageLoopForIO* watch_file_descriptor_message_loop) {
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watch_file_descriptor_message_loop_ = watch_file_descriptor_message_loop;
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}
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#if DCHECK_IS_ON()
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// TODO(robliao): http://crbug.com/698140. This addresses service thread tasks
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// that could run after the task scheduler has shut down. Anything from the
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// service thread is exempted from the task scheduler shutdown DCHECKs.
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void set_service_thread_handle(
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const PlatformThreadHandle& service_thread_handle) {
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DCHECK(!service_thread_handle.is_null());
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service_thread_handle_ = service_thread_handle;
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}
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#endif
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protected:
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// TaskTracker:
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void RunOrSkipTask(Task task, Sequence* sequence, bool can_run_task) override;
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private:
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#if DCHECK_IS_ON()
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bool IsPostingBlockShutdownTaskAfterShutdownAllowed() override;
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#endif
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MessageLoopForIO* watch_file_descriptor_message_loop_ = nullptr;
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#if DCHECK_IS_ON()
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PlatformThreadHandle service_thread_handle_;
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#endif
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DISALLOW_COPY_AND_ASSIGN(TaskTrackerPosix);
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};
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} // namespace internal
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} // namespace base
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#endif // BASE_TASK_TASK_SCHEDULER_TASK_TRACKER_POSIX_H_
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