/*
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* Copyright (C) 2016 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 "chre/platform/system_timer.h"
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#include "chre/platform/log.h"
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#include "chre/util/time.h"
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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namespace chre {
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namespace {
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constexpr uint64_t kOneSecondInNanoseconds = 1000000000;
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void NanosecondsToTimespec(uint64_t ns, struct timespec *ts) {
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ts->tv_sec = ns / kOneSecondInNanoseconds;
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ts->tv_nsec = ns % kOneSecondInNanoseconds;
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}
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} // anonymous namespace
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void SystemTimerBase::systemTimerNotifyCallback(union sigval cookie) {
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SystemTimer *sysTimer = static_cast<SystemTimer*>(cookie.sival_ptr);
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sysTimer->mCallback(sysTimer->mData);
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}
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SystemTimer::SystemTimer() {}
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SystemTimer::~SystemTimer() {
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if (mInitialized) {
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int ret = timer_delete(mTimerId);
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if (ret != 0) {
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LOGE("Couldn't delete timer: %s", strerror(errno));
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}
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mInitialized = false;
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}
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}
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bool SystemTimer::init() {
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if (mInitialized) {
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LOGW("Tried re-initializing timer");
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} else {
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struct sigevent sigevt = {};
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sigevt.sigev_notify = SIGEV_THREAD;
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sigevt.sigev_value.sival_ptr = this;
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sigevt.sigev_notify_function = systemTimerNotifyCallback;
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sigevt.sigev_notify_attributes = nullptr;
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int ret = timer_create(CLOCK_MONOTONIC, &sigevt, &mTimerId);
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if (ret != 0) {
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LOGE("Couldn't create timer: %s", strerror(errno));
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} else {
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mInitialized = true;
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}
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}
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return mInitialized;
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}
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bool SystemTimer::set(SystemTimerCallback *callback, void *data,
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Nanoseconds delay) {
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// 0 has a special meaning in POSIX, i.e. cancel the timer. In our API, a
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// value of 0 just means fire right away.
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if (delay.toRawNanoseconds() == 0) {
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delay = Nanoseconds(1);
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}
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if (mInitialized) {
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mCallback = callback;
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mData = data;
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return setInternal(delay.toRawNanoseconds());
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} else {
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return false;
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}
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}
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bool SystemTimer::cancel() {
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if (mInitialized) {
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// Setting delay to 0 disarms the timer.
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return setInternal(0);
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} else {
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return false;
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}
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}
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bool SystemTimer::isActive() {
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bool isActive = false;
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if (mInitialized) {
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struct itimerspec spec = {};
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int ret = timer_gettime(mTimerId, &spec);
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if (ret != 0) {
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LOGE("Couldn't obtain current timer configuration: %s", strerror(errno));
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}
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isActive = (spec.it_value.tv_sec > 0 || spec.it_value.tv_nsec > 0);
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}
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return isActive;
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}
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bool SystemTimerBase::setInternal(uint64_t delayNs) {
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constexpr int kFlags = 0;
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struct itimerspec spec = {};
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bool success = false;
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NanosecondsToTimespec(delayNs, &spec.it_value);
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NanosecondsToTimespec(0, &spec.it_interval);
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int ret = timer_settime(mTimerId, kFlags, &spec, nullptr);
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if (ret != 0) {
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LOGE("Couldn't set timer: %s", strerror(errno));
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} else {
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success = true;
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}
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return success;
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}
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} // namespace chre
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