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#include <library/cpp/testing/gtest/gtest.h>
#include <library/cpp/yt/threading/count_down_latch.h>
#include <thread>
namespace NYT::NThreading {
namespace {
////////////////////////////////////////////////////////////////////////////////
void WaitForLatch(const TCountDownLatch& latch)
{
latch.Wait();
EXPECT_EQ(0, latch.GetCount());
}
TEST(TCountDownLatch, TwoThreads)
{
TCountDownLatch latch(2);
std::thread t1(std::bind(&WaitForLatch, std::cref(latch)));
std::thread t2(std::bind(&WaitForLatch, std::cref(latch)));
EXPECT_EQ(2, latch.GetCount());
latch.CountDown();
EXPECT_EQ(1, latch.GetCount());
latch.CountDown();
EXPECT_EQ(0, latch.GetCount());
t1.join();
t2.join();
}
TEST(TCountDownLatch, TwoThreadsPredecremented)
{
TCountDownLatch latch(2);
EXPECT_EQ(2, latch.GetCount());
latch.CountDown();
EXPECT_EQ(1, latch.GetCount());
latch.CountDown();
EXPECT_EQ(0, latch.GetCount());
std::thread t1(std::bind(&WaitForLatch, std::cref(latch)));
std::thread t2(std::bind(&WaitForLatch, std::cref(latch)));
t1.join();
t2.join();
}
TEST(TCountDownLatch, TwoThreadsTwoLatches)
{
TCountDownLatch first(1);
TCountDownLatch second(1);
std::thread t1([&] () {
first.Wait();
second.CountDown();
EXPECT_EQ(0, first.GetCount());
EXPECT_EQ(0, second.GetCount());
});
std::thread t2([&] () {
first.CountDown();
second.Wait();
EXPECT_EQ(0, first.GetCount());
EXPECT_EQ(0, second.GetCount());
});
t1.join();
t2.join();
}
////////////////////////////////////////////////////////////////////////////////
} // namespace
} // namespace NYT::NThreading
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