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// Copyright 2018 The gVisor Authors.
//
// 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 <pthread.h>
#include <sys/time.h>
#include <cerrno>
#include <cstdint>
#include <ctime>
#include <list>
#include <memory>
#include <string>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
int64_t clock_gettime_nsecs(clockid_t id) {
struct timespec ts;
TEST_PCHECK(clock_gettime(id, &ts) == 0);
return (ts.tv_sec * 1000000000 + ts.tv_nsec);
}
// Spin on the CPU for at least ns nanoseconds, based on
// CLOCK_THREAD_CPUTIME_ID.
void spin_ns(int64_t ns) {
int64_t start = clock_gettime_nsecs(CLOCK_THREAD_CPUTIME_ID);
int64_t end = start + ns;
do {
constexpr int kLoopCount = 1000000; // large and arbitrary
// volatile to prevent the compiler from skipping this loop.
for (volatile int i = 0; i < kLoopCount; i++) {
}
} while (clock_gettime_nsecs(CLOCK_THREAD_CPUTIME_ID) < end);
}
// Test that CLOCK_PROCESS_CPUTIME_ID is a superset of CLOCK_THREAD_CPUTIME_ID.
TEST(ClockGettime, CputimeId) {
constexpr int kNumThreads = 13; // arbitrary
absl::Duration spin_time = absl::Seconds(1);
// Start off the worker threads and compute the aggregate time spent by
// the workers. Note that we test CLOCK_PROCESS_CPUTIME_ID by having the
// workers execute in parallel and verifying that CLOCK_PROCESS_CPUTIME_ID
// accumulates the runtime of all threads.
int64_t start = clock_gettime_nsecs(CLOCK_PROCESS_CPUTIME_ID);
// Create a kNumThreads threads.
std::list<ScopedThread> threads;
for (int i = 0; i < kNumThreads; i++) {
threads.emplace_back(
[spin_time] { spin_ns(absl::ToInt64Nanoseconds(spin_time)); });
}
for (auto& t : threads) {
t.Join();
}
int64_t end = clock_gettime_nsecs(CLOCK_PROCESS_CPUTIME_ID);
// The aggregate time spent in the worker threads must be at least
// 'kNumThreads' times the time each thread spun.
ASSERT_GE(end - start, kNumThreads * absl::ToInt64Nanoseconds(spin_time));
}
TEST(ClockGettime, JavaThreadTime) {
clockid_t clockid;
ASSERT_EQ(0, pthread_getcpuclockid(pthread_self(), &clockid));
struct timespec tp;
ASSERT_THAT(clock_getres(clockid, &tp), SyscallSucceeds());
EXPECT_TRUE(tp.tv_sec > 0 || tp.tv_nsec > 0);
// A thread cputime is updated each 10msec and there is no approximation
// if a task is running.
do {
ASSERT_THAT(clock_gettime(clockid, &tp), SyscallSucceeds());
} while (tp.tv_sec == 0 && tp.tv_nsec == 0);
EXPECT_TRUE(tp.tv_sec > 0 || tp.tv_nsec > 0);
}
// There is not much to test here, since CLOCK_REALTIME may be discontiguous.
TEST(ClockGettime, RealtimeWorks) {
struct timespec tp;
EXPECT_THAT(clock_gettime(CLOCK_REALTIME, &tp), SyscallSucceeds());
}
class MonotonicClockTest : public ::testing::TestWithParam<clockid_t> {};
TEST_P(MonotonicClockTest, IsMonotonic) {
auto end = absl::Now() + absl::Seconds(5);
struct timespec tp;
EXPECT_THAT(clock_gettime(GetParam(), &tp), SyscallSucceeds());
auto prev = absl::TimeFromTimespec(tp);
while (absl::Now() < end) {
EXPECT_THAT(clock_gettime(GetParam(), &tp), SyscallSucceeds());
auto now = absl::TimeFromTimespec(tp);
EXPECT_GE(now, prev);
prev = now;
}
}
std::string PrintClockId(::testing::TestParamInfo<clockid_t> info) {
switch (info.param) {
case CLOCK_MONOTONIC:
return "CLOCK_MONOTONIC";
case CLOCK_MONOTONIC_COARSE:
return "CLOCK_MONOTONIC_COARSE";
case CLOCK_MONOTONIC_RAW:
return "CLOCK_MONOTONIC_RAW";
default:
return absl::StrCat(info.param);
}
}
INSTANTIATE_TEST_SUITE_P(ClockGettime, MonotonicClockTest,
::testing::Values(CLOCK_MONOTONIC,
CLOCK_MONOTONIC_COARSE,
CLOCK_MONOTONIC_RAW),
PrintClockId);
TEST(ClockGettime, UnimplementedReturnsEINVAL) {
SKIP_IF(!IsRunningOnGvisor());
struct timespec tp;
EXPECT_THAT(clock_gettime(CLOCK_BOOTTIME, &tp),
SyscallFailsWithErrno(EINVAL));
EXPECT_THAT(clock_gettime(CLOCK_REALTIME_ALARM, &tp),
SyscallFailsWithErrno(EINVAL));
EXPECT_THAT(clock_gettime(CLOCK_BOOTTIME_ALARM, &tp),
SyscallFailsWithErrno(EINVAL));
}
TEST(ClockGettime, InvalidClockIDReturnsEINVAL) {
struct timespec tp;
EXPECT_THAT(clock_gettime(-1, &tp), SyscallFailsWithErrno(EINVAL));
}
} // namespace
} // namespace testing
} // namespace gvisor
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