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
systemTime(int clock)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.
start(void)65 void DurationTimer::start(void)
66 {
67 gettimeofday(&mStartWhen, NULL);
68 }
69
70 // Stop the timer.
stop(void)71 void DurationTimer::stop(void)
72 {
73 gettimeofday(&mStopWhen, NULL);
74 }
75
76 // Get the duration in microseconds.
durationUsecs(void) const77 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.
subtractTimevals(const struct timeval * ptv1,const struct timeval * ptv2)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.
addToTimeval(struct timeval * ptv,long usec)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