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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/base/platform/time.h"
#if V8_OS_MACOSX
#include <mach/mach_time.h>
#endif
#if V8_OS_POSIX
#include <sys/time.h>
#endif
#if V8_OS_WIN
#include "src/base/win32-headers.h"
#endif
#include <vector>
#include "src/base/platform/elapsed-timer.h"
#include "src/base/platform/platform.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace v8 {
namespace base {
TEST(TimeDelta, FromAndIn) {
EXPECT_EQ(TimeDelta::FromDays(2), TimeDelta::FromHours(48));
EXPECT_EQ(TimeDelta::FromHours(3), TimeDelta::FromMinutes(180));
EXPECT_EQ(TimeDelta::FromMinutes(2), TimeDelta::FromSeconds(120));
EXPECT_EQ(TimeDelta::FromSeconds(2), TimeDelta::FromMilliseconds(2000));
EXPECT_EQ(TimeDelta::FromMilliseconds(2), TimeDelta::FromMicroseconds(2000));
EXPECT_EQ(static_cast<int>(13), TimeDelta::FromDays(13).InDays());
EXPECT_EQ(static_cast<int>(13), TimeDelta::FromHours(13).InHours());
EXPECT_EQ(static_cast<int>(13), TimeDelta::FromMinutes(13).InMinutes());
EXPECT_EQ(static_cast<int64_t>(13), TimeDelta::FromSeconds(13).InSeconds());
EXPECT_DOUBLE_EQ(13.0, TimeDelta::FromSeconds(13).InSecondsF());
EXPECT_EQ(static_cast<int64_t>(13),
TimeDelta::FromMilliseconds(13).InMilliseconds());
EXPECT_DOUBLE_EQ(13.0, TimeDelta::FromMilliseconds(13).InMillisecondsF());
EXPECT_EQ(static_cast<int64_t>(13),
TimeDelta::FromMicroseconds(13).InMicroseconds());
}
#if V8_OS_MACOSX
TEST(TimeDelta, MachTimespec) {
TimeDelta null = TimeDelta();
EXPECT_EQ(null, TimeDelta::FromMachTimespec(null.ToMachTimespec()));
TimeDelta delta1 = TimeDelta::FromMilliseconds(42);
EXPECT_EQ(delta1, TimeDelta::FromMachTimespec(delta1.ToMachTimespec()));
TimeDelta delta2 = TimeDelta::FromDays(42);
EXPECT_EQ(delta2, TimeDelta::FromMachTimespec(delta2.ToMachTimespec()));
}
#endif
TEST(Time, JsTime) {
Time t = Time::FromJsTime(700000.3);
EXPECT_DOUBLE_EQ(700000.3, t.ToJsTime());
}
#if V8_OS_POSIX
TEST(Time, Timespec) {
Time null;
EXPECT_TRUE(null.IsNull());
EXPECT_EQ(null, Time::FromTimespec(null.ToTimespec()));
Time now = Time::Now();
EXPECT_EQ(now, Time::FromTimespec(now.ToTimespec()));
Time now_sys = Time::NowFromSystemTime();
EXPECT_EQ(now_sys, Time::FromTimespec(now_sys.ToTimespec()));
Time unix_epoch = Time::UnixEpoch();
EXPECT_EQ(unix_epoch, Time::FromTimespec(unix_epoch.ToTimespec()));
Time max = Time::Max();
EXPECT_TRUE(max.IsMax());
EXPECT_EQ(max, Time::FromTimespec(max.ToTimespec()));
}
TEST(Time, Timeval) {
Time null;
EXPECT_TRUE(null.IsNull());
EXPECT_EQ(null, Time::FromTimeval(null.ToTimeval()));
Time now = Time::Now();
EXPECT_EQ(now, Time::FromTimeval(now.ToTimeval()));
Time now_sys = Time::NowFromSystemTime();
EXPECT_EQ(now_sys, Time::FromTimeval(now_sys.ToTimeval()));
Time unix_epoch = Time::UnixEpoch();
EXPECT_EQ(unix_epoch, Time::FromTimeval(unix_epoch.ToTimeval()));
Time max = Time::Max();
EXPECT_TRUE(max.IsMax());
EXPECT_EQ(max, Time::FromTimeval(max.ToTimeval()));
}
#endif
#if V8_OS_WIN
TEST(Time, Filetime) {
Time null;
EXPECT_TRUE(null.IsNull());
EXPECT_EQ(null, Time::FromFiletime(null.ToFiletime()));
Time now = Time::Now();
EXPECT_EQ(now, Time::FromFiletime(now.ToFiletime()));
Time now_sys = Time::NowFromSystemTime();
EXPECT_EQ(now_sys, Time::FromFiletime(now_sys.ToFiletime()));
Time unix_epoch = Time::UnixEpoch();
EXPECT_EQ(unix_epoch, Time::FromFiletime(unix_epoch.ToFiletime()));
Time max = Time::Max();
EXPECT_TRUE(max.IsMax());
EXPECT_EQ(max, Time::FromFiletime(max.ToFiletime()));
}
#endif
namespace {
template <typename T>
static void ResolutionTest(T (*Now)(), TimeDelta target_granularity) {
// We're trying to measure that intervals increment in a VERY small amount
// of time -- according to the specified target granularity. Unfortunately,
// if we happen to have a context switch in the middle of our test, the
// context switch could easily exceed our limit. So, we iterate on this
// several times. As long as we're able to detect the fine-granularity
// timers at least once, then the test has succeeded.
static const TimeDelta kExpirationTimeout = TimeDelta::FromSeconds(1);
ElapsedTimer timer;
timer.Start();
TimeDelta delta;
do {
T start = Now();
T now = start;
// Loop until we can detect that the clock has changed. Non-HighRes timers
// will increment in chunks, i.e. 15ms. By spinning until we see a clock
// change, we detect the minimum time between measurements.
do {
now = Now();
delta = now - start;
} while (now <= start);
EXPECT_NE(static_cast<int64_t>(0), delta.InMicroseconds());
} while (delta > target_granularity && !timer.HasExpired(kExpirationTimeout));
EXPECT_LE(delta, target_granularity);
}
} // namespace
TEST(Time, NowResolution) {
// We assume that Time::Now() has at least 16ms resolution.
static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(16);
ResolutionTest<Time>(&Time::Now, kTargetGranularity);
}
TEST(TimeTicks, NowResolution) {
// We assume that TimeTicks::Now() has at least 16ms resolution.
static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(16);
ResolutionTest<TimeTicks>(&TimeTicks::Now, kTargetGranularity);
}
TEST(TimeTicks, HighResolutionNowResolution) {
if (!TimeTicks::IsHighResolutionClockWorking()) return;
// We assume that TimeTicks::HighResolutionNow() has sub-ms resolution.
static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(1);
ResolutionTest<TimeTicks>(&TimeTicks::HighResolutionNow, kTargetGranularity);
}
TEST(TimeTicks, IsMonotonic) {
TimeTicks previous_normal_ticks;
TimeTicks previous_highres_ticks;
ElapsedTimer timer;
timer.Start();
while (!timer.HasExpired(TimeDelta::FromMilliseconds(100))) {
TimeTicks normal_ticks = TimeTicks::Now();
TimeTicks highres_ticks = TimeTicks::HighResolutionNow();
EXPECT_GE(normal_ticks, previous_normal_ticks);
EXPECT_GE((normal_ticks - previous_normal_ticks).InMicroseconds(), 0);
EXPECT_GE(highres_ticks, previous_highres_ticks);
EXPECT_GE((highres_ticks - previous_highres_ticks).InMicroseconds(), 0);
previous_normal_ticks = normal_ticks;
previous_highres_ticks = highres_ticks;
}
}
#if V8_OS_ANDROID
#define MAYBE_ThreadNow DISABLED_ThreadNow
#else
#define MAYBE_ThreadNow ThreadNow
#endif
TEST(ThreadTicks, MAYBE_ThreadNow) {
if (ThreadTicks::IsSupported()) {
ThreadTicks::WaitUntilInitialized();
TimeTicks begin = TimeTicks::Now();
ThreadTicks begin_thread = ThreadTicks::Now();
// Make sure that ThreadNow value is non-zero.
EXPECT_GT(begin_thread, ThreadTicks());
// Sleep for 10 milliseconds to get the thread de-scheduled.
OS::Sleep(base::TimeDelta::FromMilliseconds(10));
ThreadTicks end_thread = ThreadTicks::Now();
TimeTicks end = TimeTicks::Now();
TimeDelta delta = end - begin;
TimeDelta delta_thread = end_thread - begin_thread;
// Make sure that some thread time have elapsed.
EXPECT_GT(delta_thread.InMicroseconds(), 0);
// But the thread time is at least 9ms less than clock time.
TimeDelta difference = delta - delta_thread;
EXPECT_GE(difference.InMicroseconds(), 9000);
}
}
#if V8_OS_WIN
TEST(TimeTicks, TimerPerformance) {
// Verify that various timer mechanisms can always complete quickly.
// Note: This is a somewhat arbitrary test.
const int kLoops = 10000;
typedef TimeTicks (*TestFunc)();
struct TestCase {
TestFunc func;
const char *description;
};
// Cheating a bit here: assumes sizeof(TimeTicks) == sizeof(Time)
// in order to create a single test case list.
static_assert(sizeof(TimeTicks) == sizeof(Time),
"TimeTicks and Time must be the same size");
std::vector<TestCase> cases;
cases.push_back({reinterpret_cast<TestFunc>(&Time::Now), "Time::Now"});
cases.push_back({&TimeTicks::Now, "TimeTicks::Now"});
if (ThreadTicks::IsSupported()) {
ThreadTicks::WaitUntilInitialized();
cases.push_back(
{reinterpret_cast<TestFunc>(&ThreadTicks::Now), "ThreadTicks::Now"});
}
for (const auto& test_case : cases) {
TimeTicks start = TimeTicks::Now();
for (int index = 0; index < kLoops; index++)
test_case.func();
TimeTicks stop = TimeTicks::Now();
// Turning off the check for acceptible delays. Without this check,
// the test really doesn't do much other than measure. But the
// measurements are still useful for testing timers on various platforms.
// The reason to remove the check is because the tests run on many
// buildbots, some of which are VMs. These machines can run horribly
// slow, and there is really no value for checking against a max timer.
// const int kMaxTime = 35; // Maximum acceptible milliseconds for test.
// EXPECT_LT((stop - start).InMilliseconds(), kMaxTime);
printf("%s: %1.2fus per call\n", test_case.description,
(stop - start).InMillisecondsF() * 1000 / kLoops);
}
}
#endif // V8_OS_WIN
} // namespace base
} // namespace v8
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