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/*
* Copyright (c) 2017 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 "test/single_threaded_task_queue.h"
#include <utility>
#include "rtc_base/checks.h"
#include "rtc_base/numerics/safe_conversions.h"
#include "rtc_base/ptr_util.h"
#include "rtc_base/timeutils.h"
namespace webrtc {
namespace test {
SingleThreadedTaskQueueForTesting::QueuedTask::QueuedTask(
SingleThreadedTaskQueueForTesting::TaskId task_id,
int64_t earliest_execution_time,
SingleThreadedTaskQueueForTesting::Task task)
: task_id(task_id),
earliest_execution_time(earliest_execution_time),
task(task) {}
SingleThreadedTaskQueueForTesting::QueuedTask::~QueuedTask() = default;
SingleThreadedTaskQueueForTesting::SingleThreadedTaskQueueForTesting(
const char* name)
: thread_(Run, this, name),
running_(true),
next_task_id_(0),
wake_up_(false, false) {
thread_.Start();
}
SingleThreadedTaskQueueForTesting::~SingleThreadedTaskQueueForTesting() {
RTC_DCHECK_RUN_ON(&owner_thread_checker_);
{
rtc::CritScope lock(&cs_);
running_ = false;
}
wake_up_.Set();
thread_.Stop();
}
SingleThreadedTaskQueueForTesting::TaskId
SingleThreadedTaskQueueForTesting::PostTask(Task task) {
return PostDelayedTask(task, 0);
}
SingleThreadedTaskQueueForTesting::TaskId
SingleThreadedTaskQueueForTesting::PostDelayedTask(Task task,
int64_t delay_ms) {
int64_t earliest_exec_time = rtc::TimeAfter(delay_ms);
rtc::CritScope lock(&cs_);
TaskId id = next_task_id_++;
// Insert after any other tasks with an earlier-or-equal target time.
auto it = tasks_.begin();
for (; it != tasks_.end(); it++) {
if (earliest_exec_time < (*it)->earliest_execution_time) {
break;
}
}
tasks_.insert(it, rtc::MakeUnique<QueuedTask>(id, earliest_exec_time, task));
// This class is optimized for simplicty, not for performance. This will wake
// the thread up even if the next task in the queue is only scheduled for
// quite some time from now. In that case, the thread will just send itself
// back to sleep.
wake_up_.Set();
return id;
}
void SingleThreadedTaskQueueForTesting::SendTask(Task task) {
rtc::Event done(true, false);
PostTask([&task, &done]() {
task();
done.Set();
});
done.Wait(rtc::Event::kForever);
}
bool SingleThreadedTaskQueueForTesting::CancelTask(TaskId task_id) {
rtc::CritScope lock(&cs_);
for (auto it = tasks_.begin(); it != tasks_.end(); it++) {
if ((*it)->task_id == task_id) {
tasks_.erase(it);
return true;
}
}
return false;
}
void SingleThreadedTaskQueueForTesting::Run(void* obj) {
static_cast<SingleThreadedTaskQueueForTesting*>(obj)->RunLoop();
}
void SingleThreadedTaskQueueForTesting::RunLoop() {
while (true) {
std::unique_ptr<QueuedTask> queued_task;
// An empty queue would lead to sleeping until the queue becoems non-empty.
// A queue where the earliest task is scheduled for later than now, will
// lead to sleeping until the time of the next scheduled task (or until
// more tasks are scheduled).
int wait_time = rtc::Event::kForever;
{
rtc::CritScope lock(&cs_);
if (!running_) {
return;
}
if (!tasks_.empty()) {
int64_t remaining_delay_ms = rtc::TimeDiff(
tasks_.front()->earliest_execution_time, rtc::TimeMillis());
if (remaining_delay_ms <= 0) {
queued_task = std::move(tasks_.front());
tasks_.pop_front();
} else {
wait_time = rtc::saturated_cast<int>(remaining_delay_ms);
}
}
}
if (queued_task) {
queued_task->task();
} else {
wake_up_.Wait(wait_time);
}
}
}
} // namespace test
} // namespace webrtc
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