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-// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
-//
-// 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.
-
-//! Synchronization types
-//!
-//! Most importantly, a fair mutex is included
-use parking_lot::{Mutex, MutexGuard};
-
-/// A fair mutex
-///
-/// Uses an extra lock to ensure that if one thread is waiting that it will get
-/// the lock before a single thread can re-lock it.
-pub struct FairMutex<T> {
- /// Data
- data: Mutex<T>,
- /// Next-to-access
- next: Mutex<()>,
-}
-
-impl<T> FairMutex<T> {
- /// Create a new fair mutex
- pub fn new(data: T) -> FairMutex<T> {
- FairMutex { data: Mutex::new(data), next: Mutex::new(()) }
- }
-
- /// Lock the mutex
- pub fn lock(&self) -> MutexGuard<'_, T> {
- // Must bind to a temporary or the lock will be freed before going
- // into data.lock()
- let _next = self.next.lock();
- self.data.lock()
- }
-}