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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 // host linux support requires Linux 2.6.39+
26 #if defined(__linux__)
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     // CLOCK_BOOTTIME, and Windows is windows.
46     struct timeval t;
47     t.tv_sec = t.tv_usec = 0;
48     gettimeofday(&t, nullptr);
49     return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL;
50 }
51 #endif
52 
toMillisecondTimeoutDelay(nsecs_t referenceTime,nsecs_t timeoutTime)53 int 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