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 <stdlib.h>
24 #include <time.h>
25
26 #include <android-base/macros.h>
27
28 static constexpr size_t clock_id_max = 5;
29
checkClockId(int clock)30 static void checkClockId(int clock) {
31 if (clock < 0 || clock >= clock_id_max) abort();
32 }
33
34 #if defined(__linux__)
systemTime(int clock)35 nsecs_t systemTime(int clock) {
36 checkClockId(clock);
37 static constexpr clockid_t clocks[] = {CLOCK_REALTIME, CLOCK_MONOTONIC,
38 CLOCK_PROCESS_CPUTIME_ID, CLOCK_THREAD_CPUTIME_ID,
39 CLOCK_BOOTTIME};
40 static_assert(clock_id_max == arraysize(clocks));
41 timespec t = {};
42 clock_gettime(clocks[clock], &t);
43 return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec;
44 }
45 #else
systemTime(int clock)46 nsecs_t systemTime(int clock) {
47 // TODO: is this ever called with anything but REALTIME on mac/windows?
48 checkClockId(clock);
49
50 // Clock support varies widely across hosts. Mac OS doesn't support
51 // CLOCK_BOOTTIME (and doesn't even have clock_gettime until 10.12).
52 // Windows is windows.
53 timeval t = {};
54 gettimeofday(&t, nullptr);
55 return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL;
56 }
57 #endif
58
toMillisecondTimeoutDelay(nsecs_t referenceTime,nsecs_t timeoutTime)59 int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime)
60 {
61 nsecs_t timeoutDelayMillis;
62 if (timeoutTime > referenceTime) {
63 uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime);
64 if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) {
65 timeoutDelayMillis = -1;
66 } else {
67 timeoutDelayMillis = (timeoutDelay + 999999LL) / 1000000LL;
68 }
69 } else {
70 timeoutDelayMillis = 0;
71 }
72 return (int)timeoutDelayMillis;
73 }
74