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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/arc/timer/arc_timer.h"
#include <stdlib.h>
#include <unistd.h>
#include <utility>
#include <vector>
#include "base/bind.h"
#include "base/logging.h"
#include "base/posix/unix_domain_socket.h"
#include "base/threading/thread_restrictions.h"
namespace arc {
ArcTimer::ArcTimer(base::ScopedFD expiration_fd,
mojo::InterfaceRequest<mojom::Timer> request,
ConnectionErrorCallback connection_error_callback)
: binding_(this, std::move(request)),
expiration_fd_(std::move(expiration_fd)),
connection_error_callback_(std::move(connection_error_callback)) {
// It's safe to pass |this| because the error handler will be reset when
// the |binding_| is unbound or closed.
binding_.set_connection_error_handler(
base::BindOnce(&ArcTimer::HandleConnectionError, base::Unretained(this)));
}
ArcTimer::~ArcTimer() = default;
void ArcTimer::Start(base::TimeTicks absolute_expiration_time,
StartCallback callback) {
// Start the timer to expire at |absolute_expiration_time|. This call
// automatically overrides the previous timer set.
//
// If the firing time has expired then set the timer to expire
// immediately.
base::TimeTicks current_time_ticks = base::TimeTicks::Now();
base::TimeDelta delay;
if (absolute_expiration_time > current_time_ticks)
delay = absolute_expiration_time - current_time_ticks;
base::Time current_time = base::Time::Now();
DVLOG(1) << "CurrentTime: " << current_time
<< " NextAlarmAt: " << current_time + delay;
// It's safe to pass |this| because on destruction of this object the
// timer is stopped and the callback can't be invoked.
timer_.Start(
FROM_HERE, delay,
base::BindRepeating(&ArcTimer::OnExpiration, base::Unretained(this)));
std::move(callback).Run(arc::mojom::ArcTimerResult::SUCCESS);
}
void ArcTimer::HandleConnectionError() {
// Stop any pending timers when connection with the instance is dropped.
timer_.Stop();
std::move(connection_error_callback_).Run(this);
}
void ArcTimer::OnExpiration() {
DVLOG(1) << "Expiration callback";
base::AssertBlockingAllowed();
// The instance expects 8 bytes on the read end similar to what happens on
// a timerfd expiration. The timerfd API expects this to be the number of
// expirations, however, more than one expiration isn't tracked currently.
const uint64_t timer_data = 1;
if (!base::UnixDomainSocket::SendMsg(expiration_fd_.get(), &timer_data,
sizeof(timer_data),
std::vector<int>())) {
LOG(ERROR) << "Failed to indicate timer expiration to the instance";
}
}
} // namespace arc
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