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 "gtest/gtest.h"
20
21 namespace perfetto {
22 namespace base {
23 namespace {
24
TEST(TimeTest,Conversions)25 TEST(TimeTest, Conversions) {
26 TimeMillis ms = GetWallTimeMs();
27 TimeNanos ns = GetWallTimeNs();
28 EXPECT_NEAR(ms.count(), ns.count() / 1000000, 1000);
29
30 {
31 struct timespec ts = ToPosixTimespec(TimeMillis(0));
32 EXPECT_EQ(0, ts.tv_sec);
33 EXPECT_EQ(0, ts.tv_nsec);
34 }
35 {
36 struct timespec ts = ToPosixTimespec(TimeMillis(1));
37 EXPECT_EQ(0, ts.tv_sec);
38 EXPECT_EQ(1000000, ts.tv_nsec);
39 }
40 {
41 struct timespec ts = ToPosixTimespec(TimeMillis(12345));
42 EXPECT_EQ(12, ts.tv_sec);
43 EXPECT_EQ(345000000, ts.tv_nsec);
44 }
45 {
46 struct timespec ts = ToPosixTimespec(TimeMillis(1000000000001LL));
47 EXPECT_EQ(1000000000, ts.tv_sec);
48 EXPECT_EQ(1000000, ts.tv_nsec);
49 }
50 }
51
TEST(TimeTest,GetTime)52 TEST(TimeTest, GetTime) {
53 const auto start_time = GetWallTimeNs();
54 const auto start_cputime = GetThreadCPUTimeNs();
55
56 const unsigned ns_in_ms = 1000000;
57
58 for (;;) {
59 auto cur_time = GetWallTimeNs();
60 auto elapsed = cur_time - start_time;
61 // Spin for a little while.
62 if (elapsed > TimeNanos(20 * ns_in_ms))
63 break;
64 }
65
66 auto end_cputime = GetThreadCPUTimeNs();
67 auto elapsed_cputime = end_cputime - start_cputime;
68 // Check that we're not burning much more CPU time than the length of time
69 // that we spun in the loop. We may burn much less, depending on what else is
70 // happening on the test machine.
71 EXPECT_LE(elapsed_cputime.count(), 50 * ns_in_ms);
72 }
73
74 } // namespace
75 } // namespace base
76 } // namespace perfetto
77