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      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  */
     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  */
     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  */
     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  */
     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  */
     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  */
     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 const 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 };
    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