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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 
     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