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/*
* Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/utility/maybe_worker_thread.h"
#include <utility>
#include "api/task_queue/pending_task_safety_flag.h"
#include "api/task_queue/task_queue_base.h"
#include "rtc_base/checks.h"
#include "rtc_base/event.h"
#include "rtc_base/logging.h"
#include "rtc_base/task_queue.h"
namespace webrtc {
MaybeWorkerThread::MaybeWorkerThread(const FieldTrialsView& field_trials,
absl::string_view task_queue_name,
TaskQueueFactory* factory)
: owned_task_queue_(
field_trials.IsEnabled("WebRTC-SendPacketsOnWorkerThread")
? nullptr
: factory->CreateTaskQueue(task_queue_name,
rtc::TaskQueue::Priority::NORMAL)),
worker_thread_(TaskQueueBase::Current()) {
RTC_DCHECK(worker_thread_);
RTC_LOG(LS_INFO) << "WebRTC-SendPacketsOnWorkerThread"
<< (owned_task_queue_ ? " Disabled" : " Enabled");
}
MaybeWorkerThread::~MaybeWorkerThread() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
if (owned_task_queue_) {
// owned_task_queue_ must be a valid pointer when the task queue is
// destroyed since there may be tasks that use this object that run when the
// task queue is deleted.
owned_task_queue_->Delete();
owned_task_queue_.release();
}
}
void MaybeWorkerThread::RunSynchronous(absl::AnyInvocable<void() &&> task) {
if (owned_task_queue_) {
rtc::Event thread_sync_event;
auto closure = [&thread_sync_event, task = std::move(task)]() mutable {
std::move(task)();
thread_sync_event.Set();
};
owned_task_queue_->PostTask(std::move(closure));
thread_sync_event.Wait(rtc::Event::kForever);
} else {
RTC_DCHECK_RUN_ON(&sequence_checker_);
std::move(task)();
}
}
void MaybeWorkerThread::RunOrPost(absl::AnyInvocable<void() &&> task) {
if (owned_task_queue_) {
owned_task_queue_->PostTask(std::move(task));
} else {
RTC_DCHECK_RUN_ON(&sequence_checker_);
std::move(task)();
}
}
TaskQueueBase* MaybeWorkerThread::TaskQueueForDelayedTasks() const {
RTC_DCHECK(IsCurrent());
return owned_task_queue_ ? owned_task_queue_.get() : worker_thread_;
}
TaskQueueBase* MaybeWorkerThread::TaskQueueForPost() const {
return owned_task_queue_ ? owned_task_queue_.get() : worker_thread_;
}
bool MaybeWorkerThread::IsCurrent() const {
if (owned_task_queue_) {
return owned_task_queue_->IsCurrent();
}
return worker_thread_->IsCurrent();
}
absl::AnyInvocable<void() &&> MaybeWorkerThread::MaybeSafeTask(
rtc::scoped_refptr<PendingTaskSafetyFlag> flag,
absl::AnyInvocable<void() &&> task) {
if (owned_task_queue_) {
return task;
} else {
return SafeTask(std::move(flag), std::move(task));
}
}
} // namespace webrtc
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