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https://github.com/mollyim/webrtc.git
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a10d164b4a
using shared pointer to boolean flag. Bug: None Change-Id: I9d7ad7d7b187fefa7daa0247a1379e1ddd7e2b24 Reviewed-on: https://webrtc-review.googlesource.com/96300 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24511}
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
/*
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* Copyright 2018 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rtc_base/cancelable_task_handle.h"
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#include <utility>
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#include "rtc_base/refcounter.h"
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#include "rtc_base/sequenced_task_checker.h"
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#include "rtc_base/thread_annotations.h"
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#include "rtc_base/thread_checker.h"
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namespace rtc {
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class CancelableTaskHandle::CancellationToken {
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public:
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CancellationToken() : canceled_(false), ref_count_(0) { checker_.Detach(); }
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CancellationToken(const CancellationToken&) = delete;
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CancellationToken& operator=(const CancellationToken&) = delete;
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void Cancel() {
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RTC_DCHECK_RUN_ON(&checker_);
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canceled_ = true;
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}
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bool Canceled() {
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RTC_DCHECK_RUN_ON(&checker_);
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return canceled_;
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}
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void AddRef() { ref_count_.IncRef(); }
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void Release() {
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if (ref_count_.DecRef() == rtc::RefCountReleaseStatus::kDroppedLastRef)
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delete this;
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}
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private:
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~CancellationToken() = default;
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rtc::SequencedTaskChecker checker_;
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bool canceled_ RTC_GUARDED_BY(checker_);
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webrtc::webrtc_impl::RefCounter ref_count_;
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};
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CancelableTaskHandle::CancelableTaskHandle() = default;
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CancelableTaskHandle::CancelableTaskHandle(const CancelableTaskHandle&) =
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default;
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CancelableTaskHandle::CancelableTaskHandle(CancelableTaskHandle&&) = default;
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CancelableTaskHandle& CancelableTaskHandle::operator=(
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const CancelableTaskHandle&) = default;
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CancelableTaskHandle& CancelableTaskHandle::operator=(CancelableTaskHandle&&) =
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default;
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CancelableTaskHandle::~CancelableTaskHandle() = default;
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void CancelableTaskHandle::Cancel() const {
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if (cancellation_token_.get() != nullptr)
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cancellation_token_->Cancel();
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}
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CancelableTaskHandle::CancelableTaskHandle(
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rtc::scoped_refptr<CancellationToken> cancellation_token)
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: cancellation_token_(std::move(cancellation_token)) {}
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BaseCancelableTask::~BaseCancelableTask() = default;
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CancelableTaskHandle BaseCancelableTask::GetCancellationHandle() const {
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return CancelableTaskHandle(cancellation_token_);
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}
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BaseCancelableTask::BaseCancelableTask()
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: cancellation_token_(new CancelableTaskHandle::CancellationToken) {}
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bool BaseCancelableTask::Canceled() const {
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return cancellation_token_->Canceled();
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}
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} // namespace rtc
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