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// Copyright 2017 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 "time_utils.h"
#include <sys/time.h>
#include <sys/timerfd.h>
#include <time.h>
#include "logging.h"
namespace time_utils {
uint64_t GetTimestamp() {
struct timespec ts = {};
CHECK(clock_gettime(CLOCK_MONOTONIC_COARSE, &ts) == 0);
return ts.tv_sec * 1000 + ts.tv_nsec / 1000000ul;
}
PeriodicTimer::PeriodicTimer(int interval_ms) : interval_ms_(interval_ms) {
timer_fd_ = -1;
}
PeriodicTimer::~PeriodicTimer() {
Stop();
}
void PeriodicTimer::Start() {
Stop();
timer_fd_ = timerfd_create(CLOCK_MONOTONIC, 0);
CHECK(timer_fd_ >= 0);
int sec = interval_ms_ / 1000;
int nsec = (interval_ms_ % 1000) * 1000000;
struct itimerspec ts = {};
ts.it_value.tv_nsec = nsec;
ts.it_value.tv_sec = sec;
ts.it_interval.tv_nsec = nsec;
ts.it_interval.tv_sec = sec;
CHECK(timerfd_settime(timer_fd_, 0, &ts, nullptr) == 0);
}
void PeriodicTimer::Stop() {
if (timer_fd_ < 0)
return;
close(timer_fd_);
timer_fd_ = -1;
}
bool PeriodicTimer::Wait() {
if (timer_fd_ < 0)
return false; // Not started yet.
uint64_t stub = 0;
int res = read(timer_fd_, &stub, sizeof(stub));
if (res < 0 && errno == EBADF)
return false; // Interrupted by Stop().
CHECK(res > 0);
return true;
}
} // namespace time_utils
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