shared_mutex.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef FLUTTER_FML_SYNCHRONIZATION_SHARED_MUTEX_H_
#define FLUTTER_FML_SYNCHRONIZATION_SHARED_MUTEX_H_
 
namespace fml {
 
// Interface for a reader/writer lock.
class SharedMutex {
 public:
  static SharedMutex* Create();
  virtual ~SharedMutex() = default;
 
  virtual void Lock() = 0;
  virtual void LockShared() = 0;
  virtual void Unlock() = 0;
  virtual void UnlockShared() = 0;
};
 
// RAII wrapper that does a shared acquire of a SharedMutex.
class SharedLock {
 public:
  explicit SharedLock(SharedMutex& shared_mutex) : shared_mutex_(shared_mutex) {
    shared_mutex_.LockShared();
  }
 
  ~SharedLock() { shared_mutex_.UnlockShared(); }
 
 private:
  SharedMutex& shared_mutex_;
};
 
// RAII wrapper that does an exclusive acquire of a SharedMutex.
class UniqueLock {
 public:
  explicit UniqueLock(SharedMutex& shared_mutex) : shared_mutex_(shared_mutex) {
    shared_mutex_.Lock();
  }
 
  ~UniqueLock() { shared_mutex_.Unlock(); }
 
 private:
  SharedMutex& shared_mutex_;
};
 
}  // namespace fml
 
#endif  // FLUTTER_FML_SYNCHRONIZATION_SHARED_MUTEX_H_