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