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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/TimeStamp.h"
#include "prinrval.h"
#include "prthread.h"
#include "gtest/gtest.h"
using mozilla::TimeDuration;
using mozilla::TimeStamp;
TEST(TimeStamp, Main)
{
TimeDuration td;
EXPECT_TRUE(td.ToSeconds() == 0.0);
EXPECT_TRUE(TimeDuration::FromSeconds(5).ToSeconds() == 5.0);
EXPECT_TRUE(TimeDuration::FromMilliseconds(5000).ToSeconds() == 5.0);
EXPECT_TRUE(TimeDuration::FromSeconds(1) < TimeDuration::FromSeconds(2));
EXPECT_FALSE(TimeDuration::FromSeconds(1) < TimeDuration::FromSeconds(1));
EXPECT_TRUE(TimeDuration::FromSeconds(2) > TimeDuration::FromSeconds(1));
EXPECT_FALSE(TimeDuration::FromSeconds(1) > TimeDuration::FromSeconds(1));
EXPECT_TRUE(TimeDuration::FromSeconds(1) <= TimeDuration::FromSeconds(2));
EXPECT_TRUE(TimeDuration::FromSeconds(1) <= TimeDuration::FromSeconds(1));
EXPECT_FALSE(TimeDuration::FromSeconds(2) <= TimeDuration::FromSeconds(1));
EXPECT_TRUE(TimeDuration::FromSeconds(2) >= TimeDuration::FromSeconds(1));
EXPECT_TRUE(TimeDuration::FromSeconds(1) >= TimeDuration::FromSeconds(1));
EXPECT_FALSE(TimeDuration::FromSeconds(1) >= TimeDuration::FromSeconds(2));
TimeStamp ts;
EXPECT_TRUE(ts.IsNull());
ts = TimeStamp::Now();
EXPECT_TRUE(!ts.IsNull());
EXPECT_TRUE((ts - ts).ToSeconds() == 0.0);
PR_Sleep(PR_SecondsToInterval(2));
TimeStamp ts2(TimeStamp::Now());
EXPECT_TRUE(ts2 > ts);
EXPECT_FALSE(ts > ts);
EXPECT_TRUE(ts < ts2);
EXPECT_FALSE(ts < ts);
EXPECT_TRUE(ts <= ts2);
EXPECT_TRUE(ts <= ts);
EXPECT_FALSE(ts2 <= ts);
EXPECT_TRUE(ts2 >= ts);
EXPECT_TRUE(ts2 >= ts);
EXPECT_FALSE(ts >= ts2);
// We can't be sure exactly how long PR_Sleep slept for. It should have
// slept for at least one second. We might have slept a lot longer due
// to process scheduling, but hopefully not more than 10 seconds.
td = ts2 - ts;
EXPECT_TRUE(td.ToSeconds() > 1.0);
EXPECT_TRUE(td.ToSeconds() < 20.0);
td = ts - ts2;
EXPECT_TRUE(td.ToSeconds() < -1.0);
EXPECT_TRUE(td.ToSeconds() > -20.0);
// Now() is trying to ensure the best possible precision on each platform,
// but guarantees at least one millisecond resolution. Given the huge
// difference between the assumed resolution of the clock on modern CPUs
// (< 100ns, often close to 1ns as of 2025) and that guarantee, we can safely
// test for 1ms without fearing intermittents caused by jitter.
TimeStamp start = TimeStamp::Now();
TimeStamp last = start;
int updated = 0;
int same = 0;
while ((last - start).ToMilliseconds() < 1.0) {
TimeStamp next = TimeStamp::Now();
if ((next - last).ToMicroseconds() > 0.0) {
// Only count if we saw progress in the ticks.
++updated;
last = next;
} else {
++same;
}
}
printf(" Poll saw updated iterations in 1ms: %d\n", updated);
printf(" Poll saw same iterations in 1ms: %d\n", same);
// If we saw 2 updates, we can be pretty sure to be able to guarantee at
// least 1ms resolution. In practice we see much higher numbers here (>>1K).
EXPECT_GE(updated, 2);
}
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