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
22 #include <limits.h>
23 #include <sys/time.h>
24 #include <time.h>
25
26 #if defined(HAVE_ANDROID_OS)
systemTime(int clock)27 nsecs_t systemTime(int clock)
28 {
29 static const clockid_t clocks[] = {
30 CLOCK_REALTIME,
31 CLOCK_MONOTONIC,
32 CLOCK_PROCESS_CPUTIME_ID,
33 CLOCK_THREAD_CPUTIME_ID,
34 CLOCK_BOOTTIME
35 };
36 struct timespec t;
37 t.tv_sec = t.tv_nsec = 0;
38 clock_gettime(clocks[clock], &t);
39 return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec;
40 }
41 #else
systemTime(int)42 nsecs_t systemTime(int /*clock*/)
43 {
44 // Clock support varies widely across hosts. Mac OS doesn't support
45 // posix clocks, older glibcs don't support CLOCK_BOOTTIME and Windows
46 // is windows.
47 struct timeval t;
48 t.tv_sec = t.tv_usec = 0;
49 gettimeofday(&t, NULL);
50 return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL;
51 }
52 #endif
53
toMillisecondTimeoutDelay(nsecs_t referenceTime,nsecs_t timeoutTime)54 int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime)
55 {
56 int timeoutDelayMillis;
57 if (timeoutTime > referenceTime) {
58 uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime);
59 if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) {
60 timeoutDelayMillis = -1;
61 } else {
62 timeoutDelayMillis = (timeoutDelay + 999999LL) / 1000000LL;
63 }
64 } else {
65 timeoutDelayMillis = 0;
66 }
67 return timeoutDelayMillis;
68 }
69