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 "core_jni_helpers.h"
31 
32 #include <sys/time.h>
33 #include <time.h>
34 
35 #include <utils/SystemClock.h>
36 
37 namespace android {
38 
39 /*
40  * native public static long uptimeMillis();
41  */
android_os_SystemClock_uptimeMillis(JNIEnv * env,jobject clazz)42 static 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  */
android_os_SystemClock_elapsedRealtime(JNIEnv * env,jobject clazz)51 static 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  */
android_os_SystemClock_currentThreadTimeMillis(JNIEnv * env,jobject clazz)60 static jlong android_os_SystemClock_currentThreadTimeMillis(JNIEnv* env,
61         jobject clazz)
62 {
63     struct timespec tm;
64 
65     clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
66 
67     return tm.tv_sec * 1000LL + tm.tv_nsec / 1000000;
68 }
69 
70 /*
71  * native public static long currentThreadTimeMicro();
72  */
android_os_SystemClock_currentThreadTimeMicro(JNIEnv * env,jobject clazz)73 static jlong android_os_SystemClock_currentThreadTimeMicro(JNIEnv* env,
74         jobject clazz)
75 {
76     struct timespec tm;
77 
78     clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
79 
80     return tm.tv_sec * 1000000LL + tm.tv_nsec / 1000;
81 }
82 
83 /*
84  * native public static long currentTimeMicro();
85  */
android_os_SystemClock_currentTimeMicro(JNIEnv * env,jobject clazz)86 static jlong android_os_SystemClock_currentTimeMicro(JNIEnv* env,
87         jobject clazz)
88 {
89     struct timeval tv;
90 
91     gettimeofday(&tv, NULL);
92     return tv.tv_sec * 1000000LL + tv.tv_usec;
93 }
94 
95 /*
96  * public static native long elapsedRealtimeNano();
97  */
android_os_SystemClock_elapsedRealtimeNano(JNIEnv * env,jobject clazz)98 static jlong android_os_SystemClock_elapsedRealtimeNano(JNIEnv* env,
99         jobject clazz)
100 {
101     return (jlong)elapsedRealtimeNano();
102 }
103 
104 /*
105  * JNI registration.
106  */
107 static JNINativeMethod gMethods[] = {
108     /* name, signature, funcPtr */
109     { "uptimeMillis",      "()J",
110             (void*) android_os_SystemClock_uptimeMillis },
111     { "elapsedRealtime",      "()J",
112             (void*) android_os_SystemClock_elapsedRealtime },
113     { "currentThreadTimeMillis",      "()J",
114             (void*) android_os_SystemClock_currentThreadTimeMillis },
115     { "currentThreadTimeMicro",       "()J",
116             (void*) android_os_SystemClock_currentThreadTimeMicro },
117     { "currentTimeMicro",             "()J",
118             (void*) android_os_SystemClock_currentTimeMicro },
119     { "elapsedRealtimeNanos",      "()J",
120             (void*) android_os_SystemClock_elapsedRealtimeNano },
121 };
register_android_os_SystemClock(JNIEnv * env)122 int register_android_os_SystemClock(JNIEnv* env)
123 {
124     return RegisterMethodsOrDie(env, "android/os/SystemClock", gMethods, NELEM(gMethods));
125 }
126 
127 }; // namespace android
128 
129