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
35 #if defined(HAVE_ANDROID_OS)
systemTime(int clock)36 nsecs_t systemTime(int clock)
37 {
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 }
50 #else
systemTime(int)51 nsecs_t systemTime(int /*clock*/)
52 {
53 // Clock support varies widely across hosts. Mac OS doesn't support
54 // posix clocks, older glibcs don't support CLOCK_BOOTTIME and Windows
55 // is windows.
56 struct timeval t;
57 t.tv_sec = t.tv_usec = 0;
58 gettimeofday(&t, NULL);
59 return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL;
60 }
61 #endif
62
toMillisecondTimeoutDelay(nsecs_t referenceTime,nsecs_t timeoutTime)63 int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime)
64 {
65 int timeoutDelayMillis;
66 if (timeoutTime > referenceTime) {
67 uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime);
68 if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) {
69 timeoutDelayMillis = -1;
70 } else {
71 timeoutDelayMillis = (timeoutDelay + 999999LL) / 1000000LL;
72 }
73 } else {
74 timeoutDelayMillis = 0;
75 }
76 return timeoutDelayMillis;
77 }
78