James Hawkins | e78ea77 | 2017-03-24 11:43:02 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 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 | #include "android-base/chrono_utils.h" |
| 18 | |
| 19 | #include <time.h> |
| 20 | |
| 21 | #include <chrono> |
Tom Cherry | ede0d53 | 2017-07-06 14:20:11 -0700 | [diff] [blame] | 22 | #include <sstream> |
| 23 | #include <string> |
| 24 | #include <thread> |
James Hawkins | e78ea77 | 2017-03-24 11:43:02 -0700 | [diff] [blame] | 25 | |
| 26 | #include <gtest/gtest.h> |
| 27 | |
| 28 | namespace android { |
| 29 | namespace base { |
| 30 | |
| 31 | std::chrono::seconds GetBootTimeSeconds() { |
| 32 | struct timespec now; |
Josh Gao | 0b35b18 | 2017-05-01 21:56:28 +0000 | [diff] [blame] | 33 | clock_gettime(CLOCK_BOOTTIME, &now); |
James Hawkins | e78ea77 | 2017-03-24 11:43:02 -0700 | [diff] [blame] | 34 | |
| 35 | auto now_tp = boot_clock::time_point(std::chrono::seconds(now.tv_sec) + |
| 36 | std::chrono::nanoseconds(now.tv_nsec)); |
| 37 | return std::chrono::duration_cast<std::chrono::seconds>(now_tp.time_since_epoch()); |
| 38 | } |
| 39 | |
| 40 | // Tests (at least) the seconds accuracy of the boot_clock::now() method. |
| 41 | TEST(ChronoUtilsTest, BootClockNowSeconds) { |
| 42 | auto now = GetBootTimeSeconds(); |
| 43 | auto boot_seconds = |
| 44 | std::chrono::duration_cast<std::chrono::seconds>(boot_clock::now().time_since_epoch()); |
| 45 | EXPECT_EQ(now, boot_seconds); |
| 46 | } |
| 47 | |
Tom Cherry | ede0d53 | 2017-07-06 14:20:11 -0700 | [diff] [blame] | 48 | template <typename T> |
| 49 | void ExpectAboutEqual(T expected, T actual) { |
| 50 | auto expected_upper_bound = expected * 1.05f; |
| 51 | auto expected_lower_bound = expected * .95; |
| 52 | EXPECT_GT(expected_upper_bound, actual); |
| 53 | EXPECT_LT(expected_lower_bound, actual); |
| 54 | } |
| 55 | |
| 56 | TEST(ChronoUtilsTest, TimerDurationIsSane) { |
| 57 | auto start = boot_clock::now(); |
| 58 | Timer t; |
| 59 | std::this_thread::sleep_for(50ms); |
| 60 | auto stop = boot_clock::now(); |
| 61 | auto stop_timer = t.duration(); |
| 62 | |
| 63 | auto expected = std::chrono::duration_cast<std::chrono::milliseconds>(stop - start); |
| 64 | ExpectAboutEqual(expected, stop_timer); |
| 65 | } |
| 66 | |
| 67 | TEST(ChronoUtilsTest, TimerOstream) { |
| 68 | Timer t; |
| 69 | std::this_thread::sleep_for(50ms); |
| 70 | auto stop_timer = t.duration().count(); |
| 71 | std::stringstream os; |
| 72 | os << t; |
| 73 | decltype(stop_timer) stop_timer_from_stream; |
| 74 | os >> stop_timer_from_stream; |
| 75 | EXPECT_NE(0, stop_timer); |
| 76 | ExpectAboutEqual(stop_timer, stop_timer_from_stream); |
| 77 | } |
| 78 | |
James Hawkins | e78ea77 | 2017-03-24 11:43:02 -0700 | [diff] [blame] | 79 | } // namespace base |
Tom Cherry | ede0d53 | 2017-07-06 14:20:11 -0700 | [diff] [blame] | 80 | } // namespace android |