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
37 namespace android {
38
39 static_assert(std::is_same<int64_t, jlong>::value, "jlong isn't an int64_t");
40 static_assert(std::is_same<decltype(uptimeMillis()), int64_t>::value,
41 "uptimeMillis signature change, expected int64_t return value");
42 static_assert(std::is_same<decltype(elapsedRealtime()), int64_t>::value,
43 "uptimeMillis signature change, expected int64_t return value");
44 static_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 */
android_os_SystemClock_currentThreadTimeMillis()50 static 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 */
android_os_SystemClock_currentThreadTimeMicro()62 static 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 */
android_os_SystemClock_currentTimeMicro()74 static 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 */
85 static 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 };
register_android_os_SystemClock(JNIEnv * env)100 int register_android_os_SystemClock(JNIEnv* env)
101 {
102 return RegisterMethodsOrDie(env, "android/os/SystemClock", gMethods, NELEM(gMethods));
103 }
104
105 }; // namespace android
106
107