/**
 *    Copyright (C) 2018-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    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
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/unittest/unittest.h"

#include "mongo/platform/mutex.h"

namespace mongo {
TEST(MutexTest, BasicSingleThread) {
    Mutex m;
    m.lock();
    ASSERT(!m.try_lock());
    m.unlock();
    ASSERT(m.try_lock());
    m.unlock();
}

namespace {
// Since this MONGO_MAKE_LATCH has no arguments, the mutex is anonymous
auto gMutex = MONGO_MAKE_LATCH();
}  // anonymous namespace

TEST(MutexTest, Macros) {
    // Verify a pure inline latch
    auto constexpr kLatchName = "inlineLatchForTest";
    auto m1 = MONGO_MAKE_LATCH(kLatchName);
    static_assert(std::is_same_v<decltype(m1), Mutex>);
    ASSERT_EQ(m1.getName(), kLatchName);

    // Verify a class member latch
    struct MutexHolder {
        Mutex m2 = MONGO_MAKE_LATCH("MutexHolder");
    } holder;
    static_assert(std::is_same_v<decltype(MutexHolder::m2), Mutex>);
    ASSERT_NE(holder.m2.getName().find("MutexHolder"_sd), std::string::npos);
    ASSERT_EQ(holder.m2.getName().find("m2"_sd), std::string::npos) << holder.m2.getName();

    // Verify the global named latch
    static_assert(std::is_same_v<decltype(gMutex), Mutex>);
    ASSERT_EQ(gMutex.getName(), latch_detail::kAnonymousName);
}
}  // namespace mongo