/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* System clock functions.
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*/
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#include <sys/time.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <nativehelper/JNIHelp.h>
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#include "jni.h"
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#include "core_jni_helpers.h"
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#include <sys/time.h>
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#include <time.h>
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#include <utils/SystemClock.h>
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namespace android {
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static_assert(std::is_same<int64_t, jlong>::value, "jlong isn't an int64_t");
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static_assert(std::is_same<decltype(uptimeMillis()), int64_t>::value,
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"uptimeMillis signature change, expected int64_t return value");
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static_assert(std::is_same<decltype(elapsedRealtime()), int64_t>::value,
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"uptimeMillis signature change, expected int64_t return value");
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static_assert(std::is_same<decltype(elapsedRealtimeNano()), int64_t>::value,
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"uptimeMillis signature change, expected int64_t return value");
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/*
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* native public static long currentThreadTimeMillis();
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*/
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static jlong android_os_SystemClock_currentThreadTimeMillis()
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{
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struct timespec tm;
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
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return tm.tv_sec * 1000LL + tm.tv_nsec / 1000000;
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}
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/*
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* native public static long currentThreadTimeMicro();
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*/
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static jlong android_os_SystemClock_currentThreadTimeMicro()
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{
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struct timespec tm;
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
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return tm.tv_sec * 1000000LL + tm.tv_nsec / 1000;
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}
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/*
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* native public static long currentTimeMicro();
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*/
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static jlong android_os_SystemClock_currentTimeMicro()
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec * 1000000LL + tv.tv_usec;
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}
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/*
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* JNI registration.
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*/
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static const JNINativeMethod gMethods[] = {
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// All of these are @CriticalNative, so we can defer directly to SystemClock.h for
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// some of these
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{ "uptimeMillis", "()J", (void*) uptimeMillis },
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{ "elapsedRealtime", "()J", (void*) elapsedRealtime },
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{ "elapsedRealtimeNanos", "()J", (void*) elapsedRealtimeNano },
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// SystemClock doesn't have an implementation for these that we can directly call
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{ "currentThreadTimeMillis", "()J",
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(void*) android_os_SystemClock_currentThreadTimeMillis },
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{ "currentThreadTimeMicro", "()J",
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(void*) android_os_SystemClock_currentThreadTimeMicro },
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{ "currentTimeMicro", "()J",
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(void*) android_os_SystemClock_currentTimeMicro },
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};
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int register_android_os_SystemClock(JNIEnv* env)
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{
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return RegisterMethodsOrDie(env, "android/os/SystemClock", gMethods, NELEM(gMethods));
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}
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}; // namespace android
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