android_os_SystemClock.cpp revision 38bf51466881b726f42832743d8cca6ee67bb148 
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 "JNIHelp.h"
29#include "jni.h"
30#include "android_runtime/AndroidRuntime.h"
31
32#include <sys/time.h>
33#include <time.h>
34
35#include <utils/SystemClock.h>
36
37namespace android {
38
39/*
40 * native public static long uptimeMillis();
41 */
42static jlong android_os_SystemClock_uptimeMillis(JNIEnv* env,
43        jobject clazz)
44{
45    return (jlong)uptimeMillis();
46}
47
48/*
49 * native public static long elapsedRealtime();
50 */
51static jlong android_os_SystemClock_elapsedRealtime(JNIEnv* env,
52        jobject clazz)
53{
54    return (jlong)elapsedRealtime();
55}
56
57/*
58 * native public static long currentThreadTimeMillis();
59 */
60static jlong android_os_SystemClock_currentThreadTimeMillis(JNIEnv* env,
61        jobject clazz)
62{
63#if defined(HAVE_POSIX_CLOCKS)
64    struct timespec tm;
65
66    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
67
68    return tm.tv_sec * 1000LL + tm.tv_nsec / 1000000;
69#else
70    struct timeval tv;
71
72    gettimeofday(&tv, NULL);
73    return tv.tv_sec * 1000LL + tv.tv_usec / 1000;
74#endif
75}
76
77/*
78 * native public static long currentThreadTimeMicro();
79 */
80static jlong android_os_SystemClock_currentThreadTimeMicro(JNIEnv* env,
81        jobject clazz)
82{
83#if defined(HAVE_POSIX_CLOCKS)
84    struct timespec tm;
85
86    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
87
88    return tm.tv_sec * 1000000LL + tm.tv_nsec / 1000;
89#else
90    struct timeval tv;
91
92    gettimeofday(&tv, NULL);
93    return tv.tv_sec * 1000000LL + tv.tv_nsec / 1000;
94#endif
95}
96
97/*
98 * native public static long currentTimeMicro();
99 */
100static jlong android_os_SystemClock_currentTimeMicro(JNIEnv* env,
101        jobject clazz)
102{
103    struct timeval tv;
104
105    gettimeofday(&tv, NULL);
106    return tv.tv_sec * 1000000LL + tv.tv_usec;
107}
108
109/*
110 * public static native long elapsedRealtimeNano();
111 */
112static jlong android_os_SystemClock_elapsedRealtimeNano(JNIEnv* env,
113        jobject clazz)
114{
115    return (jlong)elapsedRealtimeNano();
116}
117
118/*
119 * JNI registration.
120 */
121static JNINativeMethod gMethods[] = {
122    /* name, signature, funcPtr */
123    { "uptimeMillis",      "()J",
124            (void*) android_os_SystemClock_uptimeMillis },
125    { "elapsedRealtime",      "()J",
126            (void*) android_os_SystemClock_elapsedRealtime },
127    { "currentThreadTimeMillis",      "()J",
128            (void*) android_os_SystemClock_currentThreadTimeMillis },
129    { "currentThreadTimeMicro",       "()J",
130            (void*) android_os_SystemClock_currentThreadTimeMicro },
131    { "currentTimeMicro",             "()J",
132            (void*) android_os_SystemClock_currentTimeMicro },
133    { "elapsedRealtimeNanos",      "()J",
134            (void*) android_os_SystemClock_elapsedRealtimeNano },
135};
136int register_android_os_SystemClock(JNIEnv* env)
137{
138    return AndroidRuntime::registerNativeMethods(env,
139            "android/os/SystemClock", gMethods, NELEM(gMethods));
140}
141
142}; // namespace android
143
144