1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/base/platform/time.h"
6
7 #if V8_OS_MACOSX
8 #include <mach/mach_time.h>
9 #endif
10 #if V8_OS_POSIX
11 #include <sys/time.h>
12 #endif
13
14 #if V8_OS_WIN
15 #include "src/base/win32-headers.h"
16 #endif
17
18 #include "src/base/platform/elapsed-timer.h"
19 #include "testing/gtest/include/gtest/gtest.h"
20
21 namespace v8 {
22 namespace base {
23
TEST(TimeDelta,FromAndIn)24 TEST(TimeDelta, FromAndIn) {
25 EXPECT_EQ(TimeDelta::FromDays(2), TimeDelta::FromHours(48));
26 EXPECT_EQ(TimeDelta::FromHours(3), TimeDelta::FromMinutes(180));
27 EXPECT_EQ(TimeDelta::FromMinutes(2), TimeDelta::FromSeconds(120));
28 EXPECT_EQ(TimeDelta::FromSeconds(2), TimeDelta::FromMilliseconds(2000));
29 EXPECT_EQ(TimeDelta::FromMilliseconds(2), TimeDelta::FromMicroseconds(2000));
30 EXPECT_EQ(static_cast<int>(13), TimeDelta::FromDays(13).InDays());
31 EXPECT_EQ(static_cast<int>(13), TimeDelta::FromHours(13).InHours());
32 EXPECT_EQ(static_cast<int>(13), TimeDelta::FromMinutes(13).InMinutes());
33 EXPECT_EQ(static_cast<int64_t>(13), TimeDelta::FromSeconds(13).InSeconds());
34 EXPECT_DOUBLE_EQ(13.0, TimeDelta::FromSeconds(13).InSecondsF());
35 EXPECT_EQ(static_cast<int64_t>(13),
36 TimeDelta::FromMilliseconds(13).InMilliseconds());
37 EXPECT_DOUBLE_EQ(13.0, TimeDelta::FromMilliseconds(13).InMillisecondsF());
38 EXPECT_EQ(static_cast<int64_t>(13),
39 TimeDelta::FromMicroseconds(13).InMicroseconds());
40 }
41
42
43 #if V8_OS_MACOSX
TEST(TimeDelta,MachTimespec)44 TEST(TimeDelta, MachTimespec) {
45 TimeDelta null = TimeDelta();
46 EXPECT_EQ(null, TimeDelta::FromMachTimespec(null.ToMachTimespec()));
47 TimeDelta delta1 = TimeDelta::FromMilliseconds(42);
48 EXPECT_EQ(delta1, TimeDelta::FromMachTimespec(delta1.ToMachTimespec()));
49 TimeDelta delta2 = TimeDelta::FromDays(42);
50 EXPECT_EQ(delta2, TimeDelta::FromMachTimespec(delta2.ToMachTimespec()));
51 }
52 #endif
53
54
TEST(Time,JsTime)55 TEST(Time, JsTime) {
56 Time t = Time::FromJsTime(700000.3);
57 EXPECT_DOUBLE_EQ(700000.3, t.ToJsTime());
58 }
59
60
61 #if V8_OS_POSIX
TEST(Time,Timespec)62 TEST(Time, Timespec) {
63 Time null;
64 EXPECT_TRUE(null.IsNull());
65 EXPECT_EQ(null, Time::FromTimespec(null.ToTimespec()));
66 Time now = Time::Now();
67 EXPECT_EQ(now, Time::FromTimespec(now.ToTimespec()));
68 Time now_sys = Time::NowFromSystemTime();
69 EXPECT_EQ(now_sys, Time::FromTimespec(now_sys.ToTimespec()));
70 Time unix_epoch = Time::UnixEpoch();
71 EXPECT_EQ(unix_epoch, Time::FromTimespec(unix_epoch.ToTimespec()));
72 Time max = Time::Max();
73 EXPECT_TRUE(max.IsMax());
74 EXPECT_EQ(max, Time::FromTimespec(max.ToTimespec()));
75 }
76
77
TEST(Time,Timeval)78 TEST(Time, Timeval) {
79 Time null;
80 EXPECT_TRUE(null.IsNull());
81 EXPECT_EQ(null, Time::FromTimeval(null.ToTimeval()));
82 Time now = Time::Now();
83 EXPECT_EQ(now, Time::FromTimeval(now.ToTimeval()));
84 Time now_sys = Time::NowFromSystemTime();
85 EXPECT_EQ(now_sys, Time::FromTimeval(now_sys.ToTimeval()));
86 Time unix_epoch = Time::UnixEpoch();
87 EXPECT_EQ(unix_epoch, Time::FromTimeval(unix_epoch.ToTimeval()));
88 Time max = Time::Max();
89 EXPECT_TRUE(max.IsMax());
90 EXPECT_EQ(max, Time::FromTimeval(max.ToTimeval()));
91 }
92 #endif
93
94
95 #if V8_OS_WIN
TEST(Time,Filetime)96 TEST(Time, Filetime) {
97 Time null;
98 EXPECT_TRUE(null.IsNull());
99 EXPECT_EQ(null, Time::FromFiletime(null.ToFiletime()));
100 Time now = Time::Now();
101 EXPECT_EQ(now, Time::FromFiletime(now.ToFiletime()));
102 Time now_sys = Time::NowFromSystemTime();
103 EXPECT_EQ(now_sys, Time::FromFiletime(now_sys.ToFiletime()));
104 Time unix_epoch = Time::UnixEpoch();
105 EXPECT_EQ(unix_epoch, Time::FromFiletime(unix_epoch.ToFiletime()));
106 Time max = Time::Max();
107 EXPECT_TRUE(max.IsMax());
108 EXPECT_EQ(max, Time::FromFiletime(max.ToFiletime()));
109 }
110 #endif
111
112
113 namespace {
114
115 template <typename T>
ResolutionTest(T (* Now)(),TimeDelta target_granularity)116 static void ResolutionTest(T (*Now)(), TimeDelta target_granularity) {
117 // We're trying to measure that intervals increment in a VERY small amount
118 // of time -- according to the specified target granularity. Unfortunately,
119 // if we happen to have a context switch in the middle of our test, the
120 // context switch could easily exceed our limit. So, we iterate on this
121 // several times. As long as we're able to detect the fine-granularity
122 // timers at least once, then the test has succeeded.
123 static const TimeDelta kExpirationTimeout = TimeDelta::FromSeconds(1);
124 ElapsedTimer timer;
125 timer.Start();
126 TimeDelta delta;
127 do {
128 T start = Now();
129 T now = start;
130 // Loop until we can detect that the clock has changed. Non-HighRes timers
131 // will increment in chunks, i.e. 15ms. By spinning until we see a clock
132 // change, we detect the minimum time between measurements.
133 do {
134 now = Now();
135 delta = now - start;
136 } while (now <= start);
137 EXPECT_NE(static_cast<int64_t>(0), delta.InMicroseconds());
138 } while (delta > target_granularity && !timer.HasExpired(kExpirationTimeout));
139 EXPECT_LE(delta, target_granularity);
140 }
141
142 } // namespace
143
144
TEST(Time,NowResolution)145 TEST(Time, NowResolution) {
146 // We assume that Time::Now() has at least 16ms resolution.
147 static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(16);
148 ResolutionTest<Time>(&Time::Now, kTargetGranularity);
149 }
150
151
TEST(TimeTicks,NowResolution)152 TEST(TimeTicks, NowResolution) {
153 // We assume that TimeTicks::Now() has at least 16ms resolution.
154 static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(16);
155 ResolutionTest<TimeTicks>(&TimeTicks::Now, kTargetGranularity);
156 }
157
158
TEST(TimeTicks,HighResolutionNowResolution)159 TEST(TimeTicks, HighResolutionNowResolution) {
160 if (!TimeTicks::IsHighResolutionClockWorking()) return;
161
162 // We assume that TimeTicks::HighResolutionNow() has sub-ms resolution.
163 static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(1);
164 ResolutionTest<TimeTicks>(&TimeTicks::HighResolutionNow, kTargetGranularity);
165 }
166
167
TEST(TimeTicks,IsMonotonic)168 TEST(TimeTicks, IsMonotonic) {
169 TimeTicks previous_normal_ticks;
170 TimeTicks previous_highres_ticks;
171 ElapsedTimer timer;
172 timer.Start();
173 while (!timer.HasExpired(TimeDelta::FromMilliseconds(100))) {
174 TimeTicks normal_ticks = TimeTicks::Now();
175 TimeTicks highres_ticks = TimeTicks::HighResolutionNow();
176 EXPECT_GE(normal_ticks, previous_normal_ticks);
177 EXPECT_GE((normal_ticks - previous_normal_ticks).InMicroseconds(), 0);
178 EXPECT_GE(highres_ticks, previous_highres_ticks);
179 EXPECT_GE((highres_ticks - previous_highres_ticks).InMicroseconds(), 0);
180 previous_normal_ticks = normal_ticks;
181 previous_highres_ticks = highres_ticks;
182 }
183 }
184
185 } // namespace base
186 } // namespace v8
187