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#define LOG_TAG "SystemClock" 23 24#include <utils/SystemClock.h> 25 26#include <sys/time.h> 27#include <string.h> 28#include <errno.h> 29 30#include <cutils/compiler.h> 31 32#include <utils/Timers.h> 33#include <utils/Log.h> 34 35namespace android { 36 37/* 38 * native public static long uptimeMillis(); 39 */ 40int64_t uptimeMillis() 41{ 42 int64_t when = systemTime(SYSTEM_TIME_MONOTONIC); 43 return (int64_t) nanoseconds_to_milliseconds(when); 44} 45 46/* 47 * native public static long elapsedRealtime(); 48 */ 49int64_t elapsedRealtime() 50{ 51 return nanoseconds_to_milliseconds(elapsedRealtimeNano()); 52} 53 54/* 55 * native public static long elapsedRealtimeNano(); 56 */ 57int64_t elapsedRealtimeNano() 58{ 59#if defined(__linux__) 60 struct timespec ts; 61 int err = clock_gettime(CLOCK_BOOTTIME, &ts); 62 if (CC_UNLIKELY(err)) { 63 // This should never happen, but just in case ... 64 ALOGE("clock_gettime(CLOCK_BOOTTIME) failed: %s", strerror(errno)); 65 return 0; 66 } 67 68 return seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec; 69#else 70 return systemTime(SYSTEM_TIME_MONOTONIC); 71#endif 72} 73 74}; // namespace android 75