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//===-- AlarmTest.cpp -----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/Alarm.h"
#include "gtest/gtest.h"
#include <chrono>
#include <thread>
using namespace lldb_private;
using namespace std::chrono_literals;
// Increase the timeout tenfold when running under ASan as it can have about the
// same performance overhead.
#if __has_feature(address_sanitizer)
static constexpr auto TEST_TIMEOUT = 10000ms;
#else
static constexpr auto TEST_TIMEOUT = 1000ms;
#endif
// The time between scheduling a callback and it getting executed. This should
// NOT be increased under ASan.
static constexpr auto ALARM_TIMEOUT = 500ms;
// If there are any pending callbacks, make sure they run before the Alarm
// object is destroyed.
static constexpr bool RUN_CALLBACKS_ON_EXIT = true;
TEST(AlarmTest, Create) {
std::mutex m;
std::vector<Alarm::TimePoint> callbacks_actual;
std::vector<Alarm::TimePoint> callbacks_expected;
Alarm alarm(ALARM_TIMEOUT, RUN_CALLBACKS_ON_EXIT);
// Create 5 alarms some time apart.
for (size_t i = 0; i < 5; ++i) {
callbacks_actual.emplace_back();
callbacks_expected.emplace_back(std::chrono::system_clock::now() +
ALARM_TIMEOUT);
alarm.Create([&callbacks_actual, &m, i]() {
std::lock_guard guard(m);
callbacks_actual[i] = std::chrono::system_clock::now();
});
std::this_thread::sleep_for(ALARM_TIMEOUT / 5);
}
// Leave plenty of time for all the alarms to fire.
std::this_thread::sleep_for(TEST_TIMEOUT);
// Make sure all the alarms fired around the expected time.
for (size_t i = 0; i < 5; ++i)
EXPECT_GE(callbacks_actual[i], callbacks_expected[i]);
}
TEST(AlarmTest, Exit) {
std::mutex m;
std::vector<Alarm::Handle> handles;
std::vector<bool> callbacks;
{
Alarm alarm(ALARM_TIMEOUT, RUN_CALLBACKS_ON_EXIT);
// Create 5 alarms.
for (size_t i = 0; i < 5; ++i) {
callbacks.emplace_back(false);
handles.push_back(alarm.Create([&callbacks, &m, i]() {
std::lock_guard guard(m);
callbacks[i] = true;
}));
}
// Let the alarm go out of scope before any alarm had a chance to fire.
}
// Make sure none of the alarms fired.
for (bool callback : callbacks)
EXPECT_TRUE(callback);
}
TEST(AlarmTest, Cancel) {
std::mutex m;
std::vector<Alarm::Handle> handles;
std::vector<bool> callbacks;
Alarm alarm(ALARM_TIMEOUT, RUN_CALLBACKS_ON_EXIT);
// Create 5 alarms.
for (size_t i = 0; i < 5; ++i) {
callbacks.emplace_back(false);
handles.push_back(alarm.Create([&callbacks, &m, i]() {
std::lock_guard guard(m);
callbacks[i] = true;
}));
}
// Make sure we can cancel the first 4 alarms.
for (size_t i = 0; i < 4; ++i)
EXPECT_TRUE(alarm.Cancel(handles[i]));
// Leave plenty of time for all the alarms to fire.
std::this_thread::sleep_for(TEST_TIMEOUT);
// Make sure none of the first 4 alarms fired.
for (size_t i = 0; i < 4; ++i)
EXPECT_FALSE(callbacks[i]);
// Make sure the fifth alarm still fired.
EXPECT_TRUE(callbacks[4]);
}
TEST(AlarmTest, Restart) {
std::mutex m;
std::vector<Alarm::Handle> handles;
std::vector<Alarm::TimePoint> callbacks_actual;
std::vector<Alarm::TimePoint> callbacks_expected;
Alarm alarm(ALARM_TIMEOUT, RUN_CALLBACKS_ON_EXIT);
// Create 5 alarms some time apart.
for (size_t i = 0; i < 5; ++i) {
callbacks_actual.emplace_back();
callbacks_expected.emplace_back(std::chrono::system_clock::now() +
ALARM_TIMEOUT);
handles.push_back(alarm.Create([&callbacks_actual, &m, i]() {
std::lock_guard guard(m);
callbacks_actual[i] = std::chrono::system_clock::now();
}));
std::this_thread::sleep_for(ALARM_TIMEOUT / 5);
}
// Update the last 2 alarms.
for (size_t i = 3; i < 5; ++i) {
callbacks_expected[i] = std::chrono::system_clock::now() + ALARM_TIMEOUT;
EXPECT_TRUE(alarm.Restart(handles[i]));
}
// Leave plenty of time for all the alarms to fire.
std::this_thread::sleep_for(TEST_TIMEOUT);
// Make sure all the alarms around the expected time.
for (size_t i = 0; i < 5; ++i)
EXPECT_GE(callbacks_actual[i], callbacks_expected[i]);
}
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