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/* Copyright (c) 2009, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include <gtest/gtest.h>
#include "sql/mdl.h"
#include "unittest/gunit/thread_utils.h"
using thread::Notification;
using thread::Thread;
namespace {
const int counter_start_value = 42;
class NotificationThread : public Thread {
public:
NotificationThread(Notification *start_notification,
Notification *end_notfication, int *counter)
: m_start_notification(start_notification),
m_end_notification(end_notfication),
m_counter(counter) {}
void run() override {
// Verify counter, increment it, notify the main thread.
EXPECT_EQ(counter_start_value, *m_counter);
(*m_counter) += 1;
m_start_notification->notify();
// Wait for notification from other thread.
m_end_notification->wait_for_notification();
EXPECT_EQ(counter_start_value, *m_counter);
// Set counter again before returning from thread.
(*m_counter) += 1;
}
private:
Notification *m_start_notification;
Notification *m_end_notification;
int *m_counter;
NotificationThread(const NotificationThread &); // Not copyable.
void operator=(const NotificationThread &); // Not assignable.
};
/*
A basic, single-threaded test of Notification.
*/
TEST(Notification, Notify) {
Notification notification;
EXPECT_FALSE(notification.has_been_notified());
notification.notify();
EXPECT_TRUE(notification.has_been_notified());
}
/*
Starts a thread, and verifies that the notification/synchronization
mechanism works.
*/
TEST(NotificationThread, StartAndWait) {
Notification start_notification;
Notification end_notfication;
int counter = counter_start_value;
NotificationThread notification_thread(&start_notification, &end_notfication,
&counter);
notification_thread.start();
// Wait for the other thread to increment counter, and notify us.
start_notification.wait_for_notification();
EXPECT_EQ(counter_start_value + 1, counter);
EXPECT_TRUE(start_notification.has_been_notified());
// Reset counter, and notify other thread.
counter = counter_start_value;
end_notfication.notify();
notification_thread.join();
// We should see the final results of the thread we have joined.
EXPECT_EQ(counter_start_value + 1, counter);
}
} // namespace
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