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
31 namespace 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 */
android_os_SystemClock_setCurrentTimeMillis(JNIEnv * env,jobject clazz,jlong millis)38 static 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 */
android_os_SystemClock_uptimeMillis(JNIEnv * env,jobject clazz)47 static 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 */
android_os_SystemClock_elapsedRealtime(JNIEnv * env,jobject clazz)56 static 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 */
android_os_SystemClock_currentThreadTimeMillis(JNIEnv * env,jobject clazz)65 static 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 * JNI registration.
84 */
85 static JNINativeMethod gMethods[] = {
86 /* name, signature, funcPtr */
87 { "setCurrentTimeMillis", "(J)Z",
88 (void*) android_os_SystemClock_setCurrentTimeMillis },
89 { "uptimeMillis", "()J",
90 (void*) android_os_SystemClock_uptimeMillis },
91 { "elapsedRealtime", "()J",
92 (void*) android_os_SystemClock_elapsedRealtime },
93 { "currentThreadTimeMillis", "()J",
94 (void*) android_os_SystemClock_currentThreadTimeMillis },
95 };
register_android_os_SystemClock(JNIEnv * env)96 int register_android_os_SystemClock(JNIEnv* env)
97 {
98 return AndroidRuntime::registerNativeMethods(env,
99 "android/os/SystemClock", gMethods, NELEM(gMethods));
100 }
101
102 }; // namespace android
103
104