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 "perfetto/base/time.h"
18
19 #include "perfetto/ext/base/utils.h"
20 #include "test/gtest_and_gmock.h"
21
22 namespace perfetto {
23 namespace base {
24 namespace {
25
TEST(TimeTest,Conversions)26 TEST(TimeTest, Conversions) {
27 TimeMillis ms = GetWallTimeMs();
28 TimeNanos ns = GetWallTimeNs();
29 EXPECT_NEAR(static_cast<double>(ms.count()),
30 static_cast<double>(ns.count()) / 1000000, 1000);
31
32 {
33 struct timespec ts = ToPosixTimespec(TimeMillis(0));
34 EXPECT_EQ(0, ts.tv_sec);
35 EXPECT_EQ(0, ts.tv_nsec);
36 }
37 {
38 struct timespec ts = ToPosixTimespec(TimeMillis(1));
39 EXPECT_EQ(0, ts.tv_sec);
40 EXPECT_EQ(1000000, ts.tv_nsec);
41 }
42 {
43 struct timespec ts = ToPosixTimespec(TimeMillis(12345));
44 EXPECT_EQ(12, ts.tv_sec);
45 EXPECT_EQ(345000000, ts.tv_nsec);
46 }
47 {
48 struct timespec ts = ToPosixTimespec(TimeMillis(1000000000001LL));
49 EXPECT_EQ(1000000000, ts.tv_sec);
50 EXPECT_EQ(1000000, ts.tv_nsec);
51 }
52 }
53
TEST(TimeTest,GetTime)54 TEST(TimeTest, GetTime) {
55 const auto start_time = GetWallTimeNs();
56 const auto start_cputime = GetThreadCPUTimeNs();
57
58 const unsigned ns_in_ms = 1000000;
59
60 for (;;) {
61 auto cur_time = GetWallTimeNs();
62 auto elapsed = cur_time - start_time;
63 // Spin for a little while.
64 if (elapsed > TimeNanos(20 * ns_in_ms))
65 break;
66 }
67
68 auto end_cputime = GetThreadCPUTimeNs();
69 auto elapsed_cputime = end_cputime - start_cputime;
70 // Check that we're not burning much more CPU time than the length of time
71 // that we spun in the loop. We may burn much less, depending on what else is
72 // happening on the test machine.
73 EXPECT_LE(elapsed_cputime.count(), 50 * ns_in_ms);
74 }
75
76 // This test can work only on Posix platforms which respect the TZ env var.
77 #if PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX) || \
78 PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID) || \
79 PERFETTO_BUILDFLAG(PERFETTO_OS_APPLE)
TEST(TimeTest,GetTimezoneOffsetMins)80 TEST(TimeTest, GetTimezoneOffsetMins) {
81 const char* tz = getenv("TZ");
82 std::string tz_save(tz ? tz : "");
83 auto reset_tz_on_exit = OnScopeExit([&] {
84 if (!tz_save.empty())
85 base::SetEnv("TZ", tz_save.c_str());
86 });
87
88 // Note: the sign is reversed in the semantic of the TZ env var.
89 // UTC+2 means "2 hours to reach UTC", not "2 hours ahead of UTC".
90
91 base::SetEnv("TZ", "UTC+2");
92 EXPECT_EQ(GetTimezoneOffsetMins(), -2 * 60);
93
94 base::SetEnv("TZ", "UTC-2");
95 EXPECT_EQ(GetTimezoneOffsetMins(), 2 * 60);
96
97 base::SetEnv("TZ", "UTC-07:45");
98 EXPECT_EQ(GetTimezoneOffsetMins(), 7 * 60 + 45);
99 }
100 #endif
101
102 } // namespace
103 } // namespace base
104 } // namespace perfetto
105