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stopwatch_test.cc
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stopwatch_test.cc
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#include <chrono>
#include <future>
#include <thread>
#include <vector>
#include "external/envoy/test/test_common/simulated_time_system.h"
#include "external/envoy/test/test_common/utility.h"
#include "source/common/thread_safe_monotonic_time_stopwatch.h"
#include "test/common/fake_time_source.h"
#include "gtest/gtest.h"
namespace Nighthawk {
namespace {
using namespace std::chrono_literals;
class SimTimeStopwatchTest : public testing::Test, public Envoy::Event::TestUsingSimulatedTime {};
TEST_F(SimTimeStopwatchTest, TestElapsedAndReset) {
ThreadSafeMontonicTimeStopwatch stopwatch;
Envoy::Event::SimulatedTimeSystem& time_system = simTime();
time_system.setMonotonicTime(1ns);
// The first call should always return 0.
EXPECT_EQ(stopwatch.getElapsedNsAndReset(time_system), 0);
time_system.setMonotonicTime(2ns);
// Verify that moving the clock yields correct results.
EXPECT_EQ(stopwatch.getElapsedNsAndReset(time_system), 1);
time_system.setMonotonicTime(3ns);
EXPECT_EQ(stopwatch.getElapsedNsAndReset(time_system), 1);
time_system.setMonotonicTime(5ns);
EXPECT_EQ(stopwatch.getElapsedNsAndReset(time_system), 2);
}
TEST(ThreadSafeStopwatchTest, ThreadedStopwatchSpamming) {
constexpr uint64_t kFakeTimeSourceDefaultTick = 1000000000;
constexpr uint32_t kNumThreads = 100;
ThreadSafeMontonicTimeStopwatch stopwatch;
FakeIncrementingTimeSource time_system;
std::vector<std::thread> threads(kNumThreads);
std::promise<void> signal_all_threads_running;
std::shared_future<void> future(signal_all_threads_running.get_future());
// The first call should always return 0.
EXPECT_EQ(stopwatch.getElapsedNsAndReset(time_system), 0);
for (std::thread& thread : threads) {
thread = std::thread([&stopwatch, &time_system, kFakeTimeSourceDefaultTick, future] {
// We wait for all threads to be up and running here to maximize concurrency
// of the call below.
future.wait();
// Subsequent calls should always return 1s.
EXPECT_EQ(stopwatch.getElapsedNsAndReset(time_system), kFakeTimeSourceDefaultTick);
});
}
signal_all_threads_running.set_value();
for (std::thread& thread : threads) {
thread.join();
}
// Verify monotonic time has advanced right up to the point we expect
// it to, based on the number of threads that have excecuted.
EXPECT_EQ(time_system.monotonicTime().time_since_epoch().count(),
(kNumThreads * kFakeTimeSourceDefaultTick) + kFakeTimeSourceDefaultTick);
}
} // namespace
} // namespace Nighthawk