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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "perfetto/base/time.h"
#include "test/gtest_and_gmock.h"
namespace perfetto {
namespace base {
namespace {
TEST(TimeTest, Conversions) {
TimeMillis ms = GetWallTimeMs();
TimeNanos ns = GetWallTimeNs();
EXPECT_NEAR(ms.count(), ns.count() / 1000000, 1000);
{
struct timespec ts = ToPosixTimespec(TimeMillis(0));
EXPECT_EQ(0, ts.tv_sec);
EXPECT_EQ(0, ts.tv_nsec);
}
{
struct timespec ts = ToPosixTimespec(TimeMillis(1));
EXPECT_EQ(0, ts.tv_sec);
EXPECT_EQ(1000000, ts.tv_nsec);
}
{
struct timespec ts = ToPosixTimespec(TimeMillis(12345));
EXPECT_EQ(12, ts.tv_sec);
EXPECT_EQ(345000000, ts.tv_nsec);
}
{
struct timespec ts = ToPosixTimespec(TimeMillis(1000000000001LL));
EXPECT_EQ(1000000000, ts.tv_sec);
EXPECT_EQ(1000000, ts.tv_nsec);
}
}
TEST(TimeTest, GetTime) {
const auto start_time = GetWallTimeNs();
const auto start_cputime = GetThreadCPUTimeNs();
const unsigned ns_in_ms = 1000000;
for (;;) {
auto cur_time = GetWallTimeNs();
auto elapsed = cur_time - start_time;
// Spin for a little while.
if (elapsed > TimeNanos(20 * ns_in_ms))
break;
}
auto end_cputime = GetThreadCPUTimeNs();
auto elapsed_cputime = end_cputime - start_cputime;
// Check that we're not burning much more CPU time than the length of time
// that we spun in the loop. We may burn much less, depending on what else is
// happening on the test machine.
EXPECT_LE(elapsed_cputime.count(), 50 * ns_in_ms);
}
} // namespace
} // namespace base
} // namespace perfetto