1/*
2 * Copyright 2016-present Facebook, Inc.
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 <folly/portability/Time.h>
18
19#include <folly/portability/GTest.h>
20#include <folly/test/TestUtils.h>
21
22#include <chrono>
23
24static constexpr auto kAcceptableDeltaSecs = std::chrono::seconds(120);
25
26using folly::test::AreWithinSecs;
27
28#ifdef CLOCK_REALTIME
29
30TEST(Time, clockGettimeRealtimeAreWithin120SecsOfStdChronoSystemClock) {
31 struct timespec ts;
32 auto ret = clock_gettime(CLOCK_REALTIME, &ts);
33 ASSERT_EQ(0, ret);
34
35 auto gettimeResult =
36 std::chrono::seconds(ts.tv_sec) + std::chrono::nanoseconds(ts.tv_nsec);
37 auto stdChronoSystemClockNow =
38 std::chrono::system_clock::now().time_since_epoch();
39 ASSERT_TRUE(AreWithinSecs(
40 gettimeResult, stdChronoSystemClockNow, kAcceptableDeltaSecs));
41}
42
43#endif /* CLOCK_REALTIME */
44
45#ifdef CLOCK_MONOTONIC
46
47TEST(Time, clockGettimeMonotonicAreWithin120SecsOfStdChronoSteadyClock) {
48 struct timespec ts;
49 auto ret = clock_gettime(CLOCK_MONOTONIC, &ts);
50 ASSERT_EQ(0, ret);
51
52 auto gettimeResult =
53 std::chrono::seconds(ts.tv_sec) + std::chrono::nanoseconds(ts.tv_nsec);
54 auto stdChronoSteadyClockNow =
55 std::chrono::steady_clock::now().time_since_epoch();
56 ASSERT_TRUE(AreWithinSecs(
57 gettimeResult, stdChronoSteadyClockNow, kAcceptableDeltaSecs));
58}
59
60#endif /* CLOCK_MONOTONIC */
61
62#ifdef CLOCK_PROCESS_CPUTIME_ID
63
64TEST(Time, clockGettimeProcessCputimeIsGreaterThanZero) {
65 struct timespec ts;
66 auto ret = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
67 ASSERT_EQ(0, ret);
68
69 auto gettimeResult =
70 std::chrono::seconds(ts.tv_sec) + std::chrono::nanoseconds(ts.tv_nsec);
71
72 ASSERT_GT(gettimeResult, std::chrono::nanoseconds::zero());
73}
74
75#endif /* CLOCK_PROCESS_CPUTIME_ID */
76
77#ifdef CLOCK_THREAD_CPUTIME_ID
78
79TEST(Time, clockGettimeProcessThreadTimeIsGreaterThanZero) {
80 struct timespec ts;
81 auto ret = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
82 ASSERT_EQ(0, ret);
83
84 auto gettimeResult =
85 std::chrono::seconds(ts.tv_sec) + std::chrono::nanoseconds(ts.tv_nsec);
86
87 ASSERT_GT(gettimeResult, std::chrono::nanoseconds::zero());
88}
89
90#endif /* CLOCK_THREAD_CPUTIME_ID */
91