1 /*
2  * Copyright 2017, 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 #pragma once
18 
19 #include <stdint.h>
20 
21 // Return the current timestamp from a monotonic clock in milliseconds.
22 uint64_t now();
23 
24 class Timer {
25 public:
26     // Create a timer, initially the timer is already expired.
27     Timer();
28 
29     // Set the timer to expire in |seconds| seconds.
30     void expireSeconds(uint64_t seconds);
31 
32     // Return true if the timer has expired.
33     bool expired() const;
34     // Get the remaining time on the timer in milliseconds.
35     uint64_t remainingMillis() const;
36 
37 private:
38     uint64_t mExpires;
39 };
40 
41