Sylvestre Ledru
6149f49299
replaced by .editorconfig # ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D287878
88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
/* 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);
|
|
}
|