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