/* mbed Microcontroller Library
 * Copyright (c) 2019 ARM Limited
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef MSTD_MUTEX_
#define MSTD_MUTEX_

#include <mutex>

namespace mstd {
using std::defer_lock;
using std::defer_lock_t;
using std::try_to_lock;
using std::try_to_lock_t;
using std::adopt_lock;
using std::adopt_lock_t;

using std::lock_guard;
using std::unique_lock;

using std::try_lock;
using std::lock;

#if __cpp_lib_scoped_lock >= 201703
using std::scoped_lock;
#else
// [thread.lock.scoped]
// 2+ locks - use std::lock
template <class... MutexTypes>
class scoped_lock
#if 0 // no definition yet - needs tuple
    tuple<MutexTypes &...> pm;
    static void ignore(...) { }
public:
    explicit scoped_lock(MutexTypes &... m) : pm(tie(m...)) { mstd::lock(m...); }
    explicit scoped_lock(adopt_lock_t, MutexTypes &... m) noexcept : pm(mstd::tie(m...)) { }
    ~scoped_lock() { mstd::apply([](MutexTypes &... m) { ignore( (void(m.unlock()),0) ...); }, pm); }

    scoped_lock(const scoped_lock &) = delete;
    scoped_lock &operator=(const scoped_lock &) = delete;
}
#else
;
#endif

// 0 locks - no-op
template <>
class scoped_lock<> {
public:
    explicit scoped_lock() = default;
    explicit scoped_lock(adopt_lock_t) noexcept { }
    ~scoped_lock() = default;

    scoped_lock(const scoped_lock &) = delete;
    scoped_lock &operator=(const scoped_lock &) = delete;
};

// 1 lock - simple lock, equivalent to lock_guard<Mutex>
template <class Mutex>
class scoped_lock<Mutex> {
    Mutex &pm;
public:
    using mutex_type = Mutex;
    explicit scoped_lock(Mutex &m) : pm(m) { m.lock(); }
    explicit scoped_lock(adopt_lock_t, Mutex &m) noexcept : pm(m) { }
    ~scoped_lock() { pm.unlock(); }

    scoped_lock(const scoped_lock &) = delete;
    scoped_lock &operator=(const scoped_lock &) = delete;
};
#endif

using std::once_flag;
using std::call_once;

using std::mutex;
using std::recursive_mutex;
}

#endif // MSTD_MUTEX_