1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17
18/*
19 * System clock functions.
20 */
21
22#define LOG_TAG "SystemClock"
23
24#include <utils/SystemClock.h>
25
26#include <sys/time.h>
27#include <string.h>
28#include <errno.h>
29
30#include <cutils/compiler.h>
31
32#include <utils/Timers.h>
33#include <utils/Log.h>
34
35namespace android {
36
37/*
38 * native public static long uptimeMillis();
39 */
40int64_t uptimeMillis()
41{
42    int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
43    return (int64_t) nanoseconds_to_milliseconds(when);
44}
45
46/*
47 * native public static long elapsedRealtime();
48 */
49int64_t elapsedRealtime()
50{
51	return nanoseconds_to_milliseconds(elapsedRealtimeNano());
52}
53
54/*
55 * native public static long elapsedRealtimeNano();
56 */
57int64_t elapsedRealtimeNano()
58{
59#if defined(__linux__)
60    struct timespec ts;
61    int err = clock_gettime(CLOCK_BOOTTIME, &ts);
62    if (CC_UNLIKELY(err)) {
63        // This should never happen, but just in case ...
64        ALOGE("clock_gettime(CLOCK_BOOTTIME) failed: %s", strerror(errno));
65        return 0;
66    }
67
68    return seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
69#else
70    return systemTime(SYSTEM_TIME_MONOTONIC);
71#endif
72}
73
74}; // namespace android
75