mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 22:56:12 -04:00
127 lines
3.2 KiB
C++
127 lines
3.2 KiB
C++
// Copyright 2021 Google LLC
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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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// https://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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#include <bits/types/struct_itimerspec.h>
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#include <signal.h>
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#include <time.h>
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#include <cerrno>
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#include <cstring>
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#include <ctime>
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#include "absl/synchronization/mutex.h"
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#include "internal/platform/implementation/linux/timer.h"
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#include "internal/platform/logging.h"
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namespace nearby {
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namespace linux {
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namespace {
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timespec MillisToTimespec(int milliseconds) {
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if (milliseconds < 0) {
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milliseconds = 0;
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}
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timespec ts{};
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ts.tv_sec = milliseconds / 1000;
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ts.tv_nsec = static_cast<long>(milliseconds % 1000) * 1000000L;
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return ts;
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}
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} // namespace
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static void timer_callback(union sigval val) {
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absl::AnyInvocable<void()> *callback =
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reinterpret_cast<absl::AnyInvocable<void()> *>(val.sival_ptr);
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if (*callback != nullptr) (*callback)();
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}
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Timer::~Timer() { Stop(); }
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bool Timer::Create(int delay, int interval,
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absl::AnyInvocable<void()> callback) {
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if (delay < 0 || interval < 0) {
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LOG(ERROR) << __func__
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<< ": Delay and interval cannot be negative.";
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return false;
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}
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absl::MutexLock l(&mutex_);
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if (timerid_.has_value()) {
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if (timer_delete(*timerid_) < 0) {
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if (errno != EINVAL) {
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LOG(ERROR) << __func__ << ": Error deleting stale POSIX timer: "
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<< std::strerror(errno);
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return false;
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}
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}
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timerid_.reset();
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}
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callback_ = std::move(callback);
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struct sigevent ev{};
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ev.sigev_notify = SIGEV_THREAD;
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ev.sigev_value.sival_ptr = &callback_;
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ev.sigev_notify_function = timer_callback;
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ev.sigev_notify_attributes = nullptr;
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timer_t timerid;
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struct itimerspec spec{};
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spec.it_value = MillisToTimespec(delay);
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spec.it_interval = MillisToTimespec(interval);
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if (timer_create(CLOCK_MONOTONIC, &ev, &timerid) < 0) {
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LOG(ERROR) << __func__ << ": Error creating POSIX timer: "
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<< std::strerror(errno);
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return false;
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}
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if (timer_settime(timerid, 0, &spec, nullptr) < 0) {
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LOG(ERROR) << __func__ << ": Error arming POSIX timer: "
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<< std::strerror(errno);
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if (timer_delete(timerid) < 0) {
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LOG(ERROR) << __func__ << ": error deleting POSIX timer: "
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<< std::strerror(errno);
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}
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return false;
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}
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timerid_ = timerid;
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return true;
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}
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bool Timer::Stop() {
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absl::MutexLock l(&mutex_);
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if (!timerid_.has_value()) {
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return true;
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}
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if (timer_delete(*timerid_) < 0) {
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if (errno != EINVAL) {
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LOG(ERROR) << __func__ << ": error deleting POSIX timer: "
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<< std::strerror(errno);
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return false;
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}
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}
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timerid_.reset();
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return true;
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}
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} // namespace linux
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} // namespace nearby
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