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#include <sys/time.h>
23#include <limits.h>
24#include <fcntl.h>
25#include <errno.h>
26#include <string.h>
27
28#include <nativehelper/JNIHelp.h>
29#include "jni.h"
30#include "core_jni_helpers.h"
31
32#include <sys/time.h>
33#include <time.h>
34
35#include <utils/SystemClock.h>
36
37namespace android {
38
39static_assert(std::is_same<int64_t, jlong>::value, "jlong isn't an int64_t");
40static_assert(std::is_same<decltype(uptimeMillis()), int64_t>::value,
41        "uptimeMillis signature change, expected int64_t return value");
42static_assert(std::is_same<decltype(elapsedRealtime()), int64_t>::value,
43        "uptimeMillis signature change, expected int64_t return value");
44static_assert(std::is_same<decltype(elapsedRealtimeNano()), int64_t>::value,
45        "uptimeMillis signature change, expected int64_t return value");
46
47/*
48 * native public static long currentThreadTimeMillis();
49 */
50static jlong android_os_SystemClock_currentThreadTimeMillis()
51{
52    struct timespec tm;
53
54    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
55
56    return tm.tv_sec * 1000LL + tm.tv_nsec / 1000000;
57}
58
59/*
60 * native public static long currentThreadTimeMicro();
61 */
62static jlong android_os_SystemClock_currentThreadTimeMicro()
63{
64    struct timespec tm;
65
66    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
67
68    return tm.tv_sec * 1000000LL + tm.tv_nsec / 1000;
69}
70
71/*
72 * native public static long currentTimeMicro();
73 */
74static jlong android_os_SystemClock_currentTimeMicro()
75{
76    struct timeval tv;
77
78    gettimeofday(&tv, NULL);
79    return tv.tv_sec * 1000000LL + tv.tv_usec;
80}
81
82/*
83 * JNI registration.
84 */
85static const JNINativeMethod gMethods[] = {
86    // All of these are @CriticalNative, so we can defer directly to SystemClock.h for
87    // some of these
88    { "uptimeMillis", "()J", (void*) uptimeMillis },
89    { "elapsedRealtime", "()J", (void*) elapsedRealtime },
90    { "elapsedRealtimeNanos", "()J", (void*) elapsedRealtimeNano },
91
92    // SystemClock doesn't have an implementation for these that we can directly call
93    { "currentThreadTimeMillis", "()J",
94            (void*) android_os_SystemClock_currentThreadTimeMillis },
95    { "currentThreadTimeMicro", "()J",
96            (void*) android_os_SystemClock_currentThreadTimeMicro },
97    { "currentTimeMicro", "()J",
98            (void*) android_os_SystemClock_currentTimeMicro },
99};
100int register_android_os_SystemClock(JNIEnv* env)
101{
102    return RegisterMethodsOrDie(env, "android/os/SystemClock", gMethods, NELEM(gMethods));
103}
104
105}; // namespace android
106
107