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