1/* 2 * Copyright (C) 2005 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// Timer functions. 19// 20#include <utils/Timers.h> 21#include <utils/Log.h> 22 23#include <stdlib.h> 24#include <stdio.h> 25#include <unistd.h> 26#include <sys/time.h> 27#include <time.h> 28#include <errno.h> 29#include <limits.h> 30 31#ifdef HAVE_WIN32_THREADS 32#include <windows.h> 33#endif 34 35nsecs_t systemTime(int clock) 36{ 37#if defined(HAVE_POSIX_CLOCKS) 38 static const clockid_t clocks[] = { 39 CLOCK_REALTIME, 40 CLOCK_MONOTONIC, 41 CLOCK_PROCESS_CPUTIME_ID, 42 CLOCK_THREAD_CPUTIME_ID, 43 CLOCK_BOOTTIME 44 }; 45 struct timespec t; 46 t.tv_sec = t.tv_nsec = 0; 47 clock_gettime(clocks[clock], &t); 48 return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec; 49#else 50 // we don't support the clocks here. 51 struct timeval t; 52 t.tv_sec = t.tv_usec = 0; 53 gettimeofday(&t, NULL); 54 return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL; 55#endif 56} 57 58int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime) 59{ 60 int timeoutDelayMillis; 61 if (timeoutTime > referenceTime) { 62 uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime); 63 if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) { 64 timeoutDelayMillis = -1; 65 } else { 66 timeoutDelayMillis = (timeoutDelay + 999999LL) / 1000000LL; 67 } 68 } else { 69 timeoutDelayMillis = 0; 70 } 71 return timeoutDelayMillis; 72} 73 74 75/* 76 * =========================================================================== 77 * DurationTimer 78 * =========================================================================== 79 */ 80 81using namespace android; 82 83// Start the timer. 84void DurationTimer::start(void) 85{ 86 gettimeofday(&mStartWhen, NULL); 87} 88 89// Stop the timer. 90void DurationTimer::stop(void) 91{ 92 gettimeofday(&mStopWhen, NULL); 93} 94 95// Get the duration in microseconds. 96long long DurationTimer::durationUsecs(void) const 97{ 98 return (long) subtractTimevals(&mStopWhen, &mStartWhen); 99} 100 101// Subtract two timevals. Returns the difference (ptv1-ptv2) in 102// microseconds. 103/*static*/ long long DurationTimer::subtractTimevals(const struct timeval* ptv1, 104 const struct timeval* ptv2) 105{ 106 long long stop = ((long long) ptv1->tv_sec) * 1000000LL + 107 ((long long) ptv1->tv_usec); 108 long long start = ((long long) ptv2->tv_sec) * 1000000LL + 109 ((long long) ptv2->tv_usec); 110 return stop - start; 111} 112 113// Add the specified amount of time to the timeval. 114/*static*/ void DurationTimer::addToTimeval(struct timeval* ptv, long usec) 115{ 116 if (usec < 0) { 117 ALOG(LOG_WARN, "", "Negative values not supported in addToTimeval\n"); 118 return; 119 } 120 121 // normalize tv_usec if necessary 122 if (ptv->tv_usec >= 1000000) { 123 ptv->tv_sec += ptv->tv_usec / 1000000; 124 ptv->tv_usec %= 1000000; 125 } 126 127 ptv->tv_usec += usec % 1000000; 128 if (ptv->tv_usec >= 1000000) { 129 ptv->tv_usec -= 1000000; 130 ptv->tv_sec++; 131 } 132 ptv->tv_sec += usec / 1000000; 133} 134 135