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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 "android_runtime/AndroidRuntime.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 #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  */
     80 static 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  */
    100 static 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  */
    112 static jlong android_os_SystemClock_elapsedRealtimeNano(JNIEnv* env,
    113         jobject clazz)
    114 {
    115     return (jlong)elapsedRealtimeNano();
    116 }
    117 
    118 /*
    119  * JNI registration.
    120  */
    121 static 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 };
    136 int 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