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/*
* Copyright (C) 2005 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//
// Timer functions.
//
#include <utils/Timers.h>
#include <utils/Log.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include <errno.h>
#ifdef HAVE_WIN32_THREADS
#include <windows.h>
#endif
nsecs_t systemTime(int clock)
{
#if defined(HAVE_POSIX_CLOCKS)
static const clockid_t clocks[] = {
CLOCK_REALTIME,
CLOCK_MONOTONIC,
CLOCK_PROCESS_CPUTIME_ID,
CLOCK_THREAD_CPUTIME_ID
};
struct timespec t;
t.tv_sec = t.tv_nsec = 0;
clock_gettime(clocks[clock], &t);
return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec;
#else
// we don't support the clocks here.
struct timeval t;
t.tv_sec = t.tv_usec = 0;
gettimeofday(&t, NULL);
return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL;
#endif
}
/*
* ===========================================================================
* DurationTimer
* ===========================================================================
*/
using namespace android;
// Start the timer.
void DurationTimer::start(void)
{
gettimeofday(&mStartWhen, NULL);
}
// Stop the timer.
void DurationTimer::stop(void)
{
gettimeofday(&mStopWhen, NULL);
}
// Get the duration in microseconds.
long long DurationTimer::durationUsecs(void) const
{
return (long) subtractTimevals(&mStopWhen, &mStartWhen);
}
// Subtract two timevals. Returns the difference (ptv1-ptv2) in
// microseconds.
/*static*/ long long DurationTimer::subtractTimevals(const struct timeval* ptv1,
const struct timeval* ptv2)
{
long long stop = ((long long) ptv1->tv_sec) * 1000000LL +
((long long) ptv1->tv_usec);
long long start = ((long long) ptv2->tv_sec) * 1000000LL +
((long long) ptv2->tv_usec);
return stop - start;
}
// Add the specified amount of time to the timeval.
/*static*/ void DurationTimer::addToTimeval(struct timeval* ptv, long usec)
{
if (usec < 0) {
LOG(LOG_WARN, "", "Negative values not supported in addToTimeval\n");
return;
}
// normalize tv_usec if necessary
if (ptv->tv_usec >= 1000000) {
ptv->tv_sec += ptv->tv_usec / 1000000;
ptv->tv_usec %= 1000000;
}
ptv->tv_usec += usec % 1000000;
if (ptv->tv_usec >= 1000000) {
ptv->tv_usec -= 1000000;
ptv->tv_sec++;
}
ptv->tv_sec += usec / 1000000;
}
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