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      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 
     35 nsecs_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 
     58 int 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 
     81 using namespace android;
     82 
     83 // Start the timer.
     84 void DurationTimer::start(void)
     85 {
     86     gettimeofday(&mStartWhen, NULL);
     87 }
     88 
     89 // Stop the timer.
     90 void DurationTimer::stop(void)
     91 {
     92     gettimeofday(&mStopWhen, NULL);
     93 }
     94 
     95 // Get the duration in microseconds.
     96 long 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