spin-sync 0.3.2

Synchronization primitives using spinlock. The interface resembles std::sync. The constructors of public structs are const; i.e. it is possible to declare static Mutex<T> as long as T can be build statically.
Documentation 
// Copyright 2020 Shin Yoshida
//
// "LGPL-3.0-or-later OR Apache-2.0 OR BSD-2-Clause"
//
// This is part of spin-sync
//
//  spin-sync is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  spin-sync 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 Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public License
//  along with spin-sync.  If not, see <http://www.gnu.org/licenses/>.
//
//
// 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.
//
//
// Redistribution and use in source and binary forms, with or without modification, are permitted
// provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice, this
//    list of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

use std::marker::PhantomData;
use std::sync::{
    Barrier, BarrierWaitResult, Mutex, MutexGuard, Once, RwLock, RwLockReadGuard, RwLockWriteGuard,
};

/// PhantomData implementing !Send
///
/// Structs will implement !Send automatically to own property of this type
/// without consuming any memory.
pub type PhantomMutex<T> = PhantomData<Mutex<T>>;
pub type PhantomMutexGuard<'a, T> = PhantomData<MutexGuard<'a, T>>;
pub type PhantomRwLock<T> = PhantomData<RwLock<T>>;
pub type PhantomRwLockReadGuard<'a, T> = PhantomData<RwLockReadGuard<'a, T>>;
pub type PhantomRwLockWriteGuard<'a, T> = PhantomData<RwLockWriteGuard<'a, T>>;
pub type PhantomOnce = PhantomData<Once>;
pub type PhantomBarrier = PhantomData<Barrier>;
pub type PhantomBarrierWaitResult = PhantomData<BarrierWaitResult>;