1 /*
2  * Copyright (c) 2022 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef CGROUP_SCHED_COMMON_INCLUDE_CGROUP_SCHED_COMMON_H_
17 #define CGROUP_SCHED_COMMON_INCLUDE_CGROUP_SCHED_COMMON_H_
18 
19 #include <chrono>
20 #include <ctime>
21 
22 #include "cgroup_sched_log.h"
23 
24 #undef LOG_TAG
25 #define LOG_TAG "ChronoScope"
26 
27 namespace OHOS {
28 namespace ResourceSchedule {
29 using Clock = std::chrono::high_resolution_clock;
30 using MilliSecondsType = std::chrono::duration<double, std::milli>;
31 
32 class ChronoScope {
33 public:
ChronoScope(const std::string outmsg)34     explicit ChronoScope(const std::string outmsg) : outmsg_(outmsg)
35     {
36         out_ = nullptr;
37         t1 = Clock::now();
38     }
39 
ChronoScope(const std::string outmsg,double * out)40     ChronoScope(const std::string outmsg, double* out) : outmsg_(outmsg), out_(out)
41     {
42         t1 = Clock::now();
43     }
44 
~ChronoScope()45     ~ChronoScope()
46     {
47         Clock::time_point t2 = Clock::now();
48         MilliSecondsType time_span = std::chrono::duration_cast<MilliSecondsType>(t2 - t1);
49         CGS_LOGD("[%{public}s] cost %{public}lf milliseconds.", outmsg_.c_str(), time_span.count());
50         if (out_) {
51             *out_ = time_span.count();
52         }
53     }
54 
55 private:
56     ChronoScope(const ChronoScope&) = delete;
57     ChronoScope& operator=(const ChronoScope &) = delete;
58     ChronoScope(ChronoScope&&) = delete;
59     ChronoScope& operator=(ChronoScope&&) = delete;
60 
61     std::string outmsg_;
62     double* out_;
63     Clock::time_point t1;
64 };
65 } // namespace ResourceSchedule
66 } // namespace OHOS
67 #endif // CGROUP_SCHED_COMMON_INCLUDE_CGROUP_SCHED_COMMON_H_
68