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 "JNIHelp.h"
23#include "jni.h"
24#include "android_runtime/AndroidRuntime.h"
25
26#include "utils/SystemClock.h"
27
28#include <sys/time.h>
29#include <time.h>
30
31namespace android {
32
33/*
34 * native public static void setCurrentTimeMillis(long millis)
35 *
36 * Set the current time.  This only works when running as root.
37 */
38static jboolean android_os_SystemClock_setCurrentTimeMillis(JNIEnv* env,
39    jobject clazz, jlong millis)
40{
41    return (setCurrentTimeMillis(millis) == 0);
42}
43
44/*
45 * native public static long uptimeMillis();
46 */
47static jlong android_os_SystemClock_uptimeMillis(JNIEnv* env,
48        jobject clazz)
49{
50    return (jlong)uptimeMillis();
51}
52
53/*
54 * native public static long elapsedRealtime();
55 */
56static jlong android_os_SystemClock_elapsedRealtime(JNIEnv* env,
57        jobject clazz)
58{
59    return (jlong)elapsedRealtime();
60}
61
62/*
63 * native public static long currentThreadTimeMillis();
64 */
65static jlong android_os_SystemClock_currentThreadTimeMillis(JNIEnv* env,
66        jobject clazz)
67{
68#if defined(HAVE_POSIX_CLOCKS)
69    struct timespec tm;
70
71    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
72
73    return tm.tv_sec * 1000LL + tm.tv_nsec / 1000000;
74#else
75    struct timeval tv;
76
77    gettimeofday(&tv, NULL);
78    return tv.tv_sec * 1000LL + tv.tv_usec / 1000;
79#endif
80}
81
82/*
83 * native public static long currentThreadTimeMicro();
84 */
85static jlong android_os_SystemClock_currentThreadTimeMicro(JNIEnv* env,
86        jobject clazz)
87{
88#if defined(HAVE_POSIX_CLOCKS)
89    struct timespec tm;
90
91    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
92
93    return tm.tv_sec * 1000000LL + tm.tv_nsec / 1000;
94#else
95    struct timeval tv;
96
97    gettimeofday(&tv, NULL);
98    return tv.tv_sec * 1000000LL + tv.tv_nsec / 1000;
99#endif
100}
101
102/*
103 * native public static long currentTimeMicro();
104 */
105static jlong android_os_SystemClock_currentTimeMicro(JNIEnv* env,
106        jobject clazz)
107{
108    struct timeval tv;
109
110    gettimeofday(&tv, NULL);
111    return tv.tv_sec * 1000000LL + tv.tv_usec;
112}
113
114/*
115 * public static native long elapsedRealtimeNano();
116 */
117static jlong android_os_SystemClock_elapsedRealtimeNano(JNIEnv* env,
118        jobject clazz)
119{
120    return (jlong)elapsedRealtimeNano();
121}
122
123/*
124 * JNI registration.
125 */
126static JNINativeMethod gMethods[] = {
127    /* name, signature, funcPtr */
128    { "setCurrentTimeMillis",      "(J)Z",
129            (void*) android_os_SystemClock_setCurrentTimeMillis },
130    { "uptimeMillis",      "()J",
131            (void*) android_os_SystemClock_uptimeMillis },
132    { "elapsedRealtime",      "()J",
133            (void*) android_os_SystemClock_elapsedRealtime },
134    { "currentThreadTimeMillis",      "()J",
135            (void*) android_os_SystemClock_currentThreadTimeMillis },
136    { "currentThreadTimeMicro",       "()J",
137            (void*) android_os_SystemClock_currentThreadTimeMicro },
138    { "currentTimeMicro",             "()J",
139            (void*) android_os_SystemClock_currentTimeMicro },
140    { "elapsedRealtimeNanos",      "()J",
141            (void*) android_os_SystemClock_elapsedRealtimeNano },
142};
143int register_android_os_SystemClock(JNIEnv* env)
144{
145    return AndroidRuntime::registerNativeMethods(env,
146            "android/os/SystemClock", gMethods, NELEM(gMethods));
147}
148
149}; // namespace android
150
151