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// Copyright 2022 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "pw_async/dispatcher_basic.h"
#include "pw_log/log.h"
using namespace std::chrono_literals;
namespace pw::async {
const chrono::SystemClock::duration SLEEP_DURATION = 5s;
void BasicDispatcher::Run() {
lock_.lock();
while (!stop_requested_) {
RunLoopOnce();
}
lock_.unlock();
}
void BasicDispatcher::RunUntilIdle() {
lock_.lock();
while (!task_queue_.empty()) {
RunLoopOnce();
}
lock_.unlock();
}
void BasicDispatcher::RunUntil(chrono::SystemClock::time_point end_time) {
lock_.lock();
while (end_time < Now()) {
RunLoopOnce();
}
lock_.unlock();
}
void BasicDispatcher::RunFor(chrono::SystemClock::duration duration) {
RunUntil(Now() + duration);
}
void BasicDispatcher::RunLoopOnce() {
if (task_queue_.empty() || DueTime(task_queue_.front()) > Now()) {
// Sleep until a notification is received or until the due time of the
// next task. Notifications are sent when tasks are posted or 'stop' is
// requested.
chrono::SystemClock::time_point wake_time =
task_queue_.empty() ? Now() + SLEEP_DURATION
: DueTime(task_queue_.front());
lock_.unlock();
PW_LOG_DEBUG("no task due; waiting for signal");
timed_notification_.try_acquire_until(wake_time);
lock_.lock();
return;
}
while (!task_queue_.empty() && DueTime(task_queue_.front()) <= Now()) {
Task& task = task_queue_.front();
task_queue_.pop_front();
if (IsPeriodic(task)) {
PostTaskInternal(task, DueTime(task) + SetInterval(task));
}
lock_.unlock();
PW_LOG_DEBUG("running task");
Context ctx{this, &task};
task(ctx);
lock_.lock();
}
}
void BasicDispatcher::RequestStop() {
std::lock_guard lock(lock_);
PW_LOG_DEBUG("stop requested");
stop_requested_ = true;
task_queue_.clear();
timed_notification_.release();
}
void BasicDispatcher::PostTask(Task& task) { PostTaskForTime(task, Now()); }
void BasicDispatcher::PostDelayedTask(Task& task,
chrono::SystemClock::duration delay) {
PostTaskForTime(task, Now() + delay);
}
void BasicDispatcher::PostTaskForTime(Task& task,
chrono::SystemClock::time_point time) {
lock_.lock();
PW_LOG_DEBUG("posting task");
PostTaskInternal(task, time);
lock_.unlock();
}
void BasicDispatcher::SchedulePeriodicTask(
Task& task, chrono::SystemClock::duration interval) {
SchedulePeriodicTask(task, interval, Now());
}
void BasicDispatcher::SchedulePeriodicTask(
Task& task,
chrono::SystemClock::duration interval,
chrono::SystemClock::time_point start_time) {
SetInterval(task, interval);
PostTaskForTime(task, start_time);
}
bool BasicDispatcher::Cancel(Task& task) {
std::lock_guard lock(lock_);
return task_queue_.remove(task);
}
// Ensure lock_ is held when invoking this function.
void BasicDispatcher::PostTaskInternal(
Task& task, chrono::SystemClock::time_point time_due) {
SetDueTime(task, time_due);
auto it_front = task_queue_.begin();
auto it_behind = task_queue_.before_begin();
while (it_front != task_queue_.end() && time_due > DueTime(*it_front)) {
++it_front;
++it_behind;
}
task_queue_.insert_after(it_behind, task);
timed_notification_.release();
}
} // namespace pw::async
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