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///////////////////////////////////////////////////////////////////////////////

// Copyright (c) Lewis Baker

// Licenced under MIT license. See LICENSE.txt for details.

///////////////////////////////////////////////////////////////////////////////

#include <cppcoro/async_latch.hpp>

#include <cppcoro/single_consumer_event.hpp>

#include <cppcoro/task.hpp>

#include <cppcoro/when_all_ready.hpp>

#include <cppcoro/sync_wait.hpp>

#include <ostream>

#include "doctest/doctest.h"

TEST_SUITE_BEGIN("async_latch");

using namespace cppcoro;

TEST_CASE("latch constructed with zero count is initially ready")

{

async_latch latch(0);

CHECK(latch.is_ready());

}

TEST_CASE("latch constructed with negative count is initially ready")

{

async_latch latch(-3);

CHECK(latch.is_ready());

}

TEST_CASE("count_down and is_ready")

{

async_latch latch(3);

CHECK(!latch.is_ready());

latch.count_down();

CHECK(!latch.is_ready());

latch.count_down();

CHECK(!latch.is_ready());

latch.count_down();

CHECK(latch.is_ready());

}

TEST_CASE("count_down by n")

{

async_latch latch(5);

latch.count_down(3);

CHECK(!latch.is_ready());

latch.count_down(2);

CHECK(latch.is_ready());

}

TEST_CASE("single awaiter")

{

async_latch latch(2);

bool after = false;

sync_wait(when_all_ready(

[&]() -> task<>

{

co_await latch;

after = true;

}(),

[&]() -> task<>

{

CHECK(!after);

latch.count_down();

CHECK(!after);

latch.count_down();

CHECK(after);

co_return;

}()

));

}

TEST_CASE("multiple awaiters")

{

async_latch latch(2);

bool after1 = false;

bool after2 = false;

bool after3 = false;

sync_wait(when_all_ready(

[&]() -> task<>

{

co_await latch;

after1 = true;

}(),

[&]() -> task<>

{

co_await latch;

after2 = true;

}(),

[&]() -> task<>

{

co_await latch;

after3 = true;

}(),

[&]() -> task<>

{

CHECK(!after1);

CHECK(!after2);

CHECK(!after3);

latch.count_down();

CHECK(!after1);

CHECK(!after2);

CHECK(!after3);

latch.count_down();

CHECK(after1);

CHECK(after2);

CHECK(after3);

co_return;

}()));

}

TEST_SUITE_END();