89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
/*
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* Copyright 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "os/alarm.h"
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#include <sys/timerfd.h>
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#include <unistd.h>
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#include <cstring>
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#include "common/bind.h"
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#include "os/linux_generic/linux.h"
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#include "os/log.h"
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#include "os/utils.h"
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#ifdef OS_ANDROID
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#define ALARM_CLOCK CLOCK_BOOTTIME_ALARM
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#else
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#define ALARM_CLOCK CLOCK_BOOTTIME
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#endif
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namespace bluetooth {
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namespace os {
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using common::Closure;
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using common::OnceClosure;
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Alarm::Alarm(Handler* handler) : handler_(handler), fd_(TIMERFD_CREATE(ALARM_CLOCK, 0)) {
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ASSERT_LOG(fd_ != -1, "cannot create timerfd: %s", strerror(errno));
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token_ = handler_->thread_->GetReactor()->Register(
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fd_, common::Bind(&Alarm::on_fire, common::Unretained(this)), Closure());
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}
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Alarm::~Alarm() {
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handler_->thread_->GetReactor()->Unregister(token_);
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int close_status;
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RUN_NO_INTR(close_status = TIMERFD_CLOSE(fd_));
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ASSERT(close_status != -1);
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}
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void Alarm::Schedule(OnceClosure task, std::chrono::milliseconds delay) {
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std::lock_guard<std::mutex> lock(mutex_);
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long delay_ms = delay.count();
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itimerspec timer_itimerspec{{/* interval for periodic timer */}, {delay_ms / 1000, delay_ms % 1000 * 1000000}};
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int result = TIMERFD_SETTIME(fd_, 0, &timer_itimerspec, nullptr);
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ASSERT(result == 0);
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task_ = std::move(task);
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}
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void Alarm::Cancel() {
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std::lock_guard<std::mutex> lock(mutex_);
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itimerspec disarm_itimerspec{/* disarm timer */};
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int result = TIMERFD_SETTIME(fd_, 0, &disarm_itimerspec, nullptr);
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ASSERT(result == 0);
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}
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void Alarm::on_fire() {
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std::unique_lock<std::mutex> lock(mutex_);
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auto task = std::move(task_);
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uint64_t times_invoked;
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auto bytes_read = read(fd_, ×_invoked, sizeof(uint64_t));
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lock.unlock();
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std::move(task).Run();
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ASSERT(bytes_read == static_cast<ssize_t>(sizeof(uint64_t)));
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ASSERT_LOG(
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times_invoked == static_cast<uint64_t>(1),
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"Invoked number of times:%lu fd:%d",
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(unsigned long)times_invoked,
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fd_);
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}
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} // namespace os
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} // namespace bluetooth
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