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/*
* Copyright © Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 or 3 as
* published by the Free Software Foundation.
*
* 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mir/signal.h"
#include <gtest/gtest.h>
#include <gmock/gmock.h>
#include <thread>
#include <latch>
#include "mir/test/auto_unblock_thread.h"
namespace mt = mir::test;
TEST(Signal, waits_until_raised)
{
mir::Signal signal;
std::atomic<bool> event_hit{false};
std::latch thread_spawned{2};
std::thread waiter_thread{
[&]()
{
thread_spawned.arrive_and_wait();
EXPECT_FALSE(event_hit);
signal.wait();
EXPECT_TRUE(event_hit);
}
};
thread_spawned.arrive_and_wait();
std::this_thread::sleep_for(std::chrono::milliseconds{100});
event_hit = true;
signal.raise();
waiter_thread.join();
}
TEST(Signal, racing_raises_release_at_least_one_waiter)
{
mir::Signal signal;
int const thread_count{10};
std::latch threads_spawned{thread_count + 1};
std::vector<mt::AutoJoinThread> racing_releasers;
for(auto i = 0; i < thread_count; ++i)
{
racing_releasers.emplace_back(
mt::AutoJoinThread{
[&]()
{
threads_spawned.arrive_and_wait();
signal.raise();
}
});
}
threads_spawned.arrive_and_wait();
signal.wait();
}
TEST(Signal, pre_raised_signal_releases_immediately)
{
mir::Signal signal;
signal.raise();
signal.wait();
}
TEST(Signal, release_from_wait_resets_signal)
{
mir::Signal signal;
std::chrono::milliseconds const delay{500};
mt::AutoJoinThread releaser{
[&]()
{
signal.raise();
std::this_thread::sleep_for(delay * 2);
signal.raise();
}
};
signal.wait();
auto now = std::chrono::steady_clock::now();
signal.wait();
EXPECT_THAT(std::chrono::steady_clock::now(), testing::Gt(now + delay));
}
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