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 30 #ifdef HAVE_WIN32_THREADS 31 #include <windows.h> 32 #endif 33 34 nsecs_t systemTime(int clock) 35 { 36 #if defined(HAVE_POSIX_CLOCKS) 37 static const clockid_t clocks[] = { 38 CLOCK_REALTIME, 39 CLOCK_MONOTONIC, 40 CLOCK_PROCESS_CPUTIME_ID, 41 CLOCK_THREAD_CPUTIME_ID 42 }; 43 struct timespec t; 44 t.tv_sec = t.tv_nsec = 0; 45 clock_gettime(clocks[clock], &t); 46 return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec; 47 #else 48 // we don't support the clocks here. 49 struct timeval t; 50 t.tv_sec = t.tv_usec = 0; 51 gettimeofday(&t, NULL); 52 return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL; 53 #endif 54 } 55 56 /* 57 * =========================================================================== 58 * DurationTimer 59 * =========================================================================== 60 */ 61 62 using namespace android; 63 64 // Start the timer. 65 void DurationTimer::start(void) 66 { 67 gettimeofday(&mStartWhen, NULL); 68 } 69 70 // Stop the timer. 71 void DurationTimer::stop(void) 72 { 73 gettimeofday(&mStopWhen, NULL); 74 } 75 76 // Get the duration in microseconds. 77 long long DurationTimer::durationUsecs(void) const 78 { 79 return (long) subtractTimevals(&mStopWhen, &mStartWhen); 80 } 81 82 // Subtract two timevals. Returns the difference (ptv1-ptv2) in 83 // microseconds. 84 /*static*/ long long DurationTimer::subtractTimevals(const struct timeval* ptv1, 85 const struct timeval* ptv2) 86 { 87 long long stop = ((long long) ptv1->tv_sec) * 1000000LL + 88 ((long long) ptv1->tv_usec); 89 long long start = ((long long) ptv2->tv_sec) * 1000000LL + 90 ((long long) ptv2->tv_usec); 91 return stop - start; 92 } 93 94 // Add the specified amount of time to the timeval. 95 /*static*/ void DurationTimer::addToTimeval(struct timeval* ptv, long usec) 96 { 97 if (usec < 0) { 98 LOG(LOG_WARN, "", "Negative values not supported in addToTimeval\n"); 99 return; 100 } 101 102 // normalize tv_usec if necessary 103 if (ptv->tv_usec >= 1000000) { 104 ptv->tv_sec += ptv->tv_usec / 1000000; 105 ptv->tv_usec %= 1000000; 106 } 107 108 ptv->tv_usec += usec % 1000000; 109 if (ptv->tv_usec >= 1000000) { 110 ptv->tv_usec -= 1000000; 111 ptv->tv_sec++; 112 } 113 ptv->tv_sec += usec / 1000000; 114 } 115 116