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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* System clock functions.
*/
#if defined(__ANDROID__)
#include <linux/ioctl.h>
#include <linux/rtc.h>
#include <utils/Atomic.h>
#include <linux/android_alarm.h>
#endif
#include <sys/time.h>
#include <limits.h>
#include <fcntl.h>
#include <string.h>
#include <utils/SystemClock.h>
#include <utils/Timers.h>
#define LOG_TAG "SystemClock"
#include <utils/Log.h>
namespace android {
/*
* native public static long uptimeMillis();
*/
int64_t uptimeMillis()
{
int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
return (int64_t) nanoseconds_to_milliseconds(when);
}
/*
* native public static long elapsedRealtime();
*/
int64_t elapsedRealtime()
{
return nanoseconds_to_milliseconds(elapsedRealtimeNano());
}
/*
* native public static long elapsedRealtimeNano();
*/
int64_t elapsedRealtimeNano()
{
#if defined(__ANDROID__)
static int s_fd = -1;
if (s_fd == -1) {
int fd = open("/dev/alarm", O_RDONLY);
if (android_atomic_cmpxchg(-1, fd, &s_fd)) {
close(fd);
}
}
struct timespec ts;
if (ioctl(s_fd, ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts) == 0) {
return seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
}
// /dev/alarm doesn't exist, fallback to CLOCK_BOOTTIME
if (clock_gettime(CLOCK_BOOTTIME, &ts) == 0) {
return seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
}
// XXX: there was an error, probably because the driver didn't
// exist ... this should return
// a real error, like an exception!
return systemTime(SYSTEM_TIME_MONOTONIC);
#else
return systemTime(SYSTEM_TIME_MONOTONIC);
#endif
}
}; // namespace android
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