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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     };
     44     struct timespec t;
     45     t.tv_sec = t.tv_nsec = 0;
     46     clock_gettime(clocks[clock], &t);
     47     return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec;
     48 #else
     49     // we don't support the clocks here.
     50     struct timeval t;
     51     t.tv_sec = t.tv_usec = 0;
     52     gettimeofday(&t, NULL);
     53     return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL;
     54 #endif
     55 }
     56 
     57 int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime)
     58 {
     59     int timeoutDelayMillis;
     60     if (timeoutTime > referenceTime) {
     61         uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime);
     62         if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) {
     63             timeoutDelayMillis = -1;
     64         } else {
     65             timeoutDelayMillis = (timeoutDelay + 999999LL) / 1000000LL;
     66         }
     67     } else {
     68         timeoutDelayMillis = 0;
     69     }
     70     return timeoutDelayMillis;
     71 }
     72 
     73 
     74 /*
     75  * ===========================================================================
     76  *      DurationTimer
     77  * ===========================================================================
     78  */
     79 
     80 using namespace android;
     81 
     82 // Start the timer.
     83 void DurationTimer::start(void)
     84 {
     85     gettimeofday(&mStartWhen, NULL);
     86 }
     87 
     88 // Stop the timer.
     89 void DurationTimer::stop(void)
     90 {
     91     gettimeofday(&mStopWhen, NULL);
     92 }
     93 
     94 // Get the duration in microseconds.
     95 long long DurationTimer::durationUsecs(void) const
     96 {
     97     return (long) subtractTimevals(&mStopWhen, &mStartWhen);
     98 }
     99 
    100 // Subtract two timevals.  Returns the difference (ptv1-ptv2) in
    101 // microseconds.
    102 /*static*/ long long DurationTimer::subtractTimevals(const struct timeval* ptv1,
    103     const struct timeval* ptv2)
    104 {
    105     long long stop  = ((long long) ptv1->tv_sec) * 1000000LL +
    106                       ((long long) ptv1->tv_usec);
    107     long long start = ((long long) ptv2->tv_sec) * 1000000LL +
    108                       ((long long) ptv2->tv_usec);
    109     return stop - start;
    110 }
    111 
    112 // Add the specified amount of time to the timeval.
    113 /*static*/ void DurationTimer::addToTimeval(struct timeval* ptv, long usec)
    114 {
    115     if (usec < 0) {
    116         LOG(LOG_WARN, "", "Negative values not supported in addToTimeval\n");
    117         return;
    118     }
    119 
    120     // normalize tv_usec if necessary
    121     if (ptv->tv_usec >= 1000000) {
    122         ptv->tv_sec += ptv->tv_usec / 1000000;
    123         ptv->tv_usec %= 1000000;
    124     }
    125 
    126     ptv->tv_usec += usec % 1000000;
    127     if (ptv->tv_usec >= 1000000) {
    128         ptv->tv_usec -= 1000000;
    129         ptv->tv_sec++;
    130     }
    131     ptv->tv_sec += usec / 1000000;
    132 }
    133 
    134