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RocksDB for Erlang

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rocksdb deps rocksdb util distributed_mutex.h
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deps/rocksdb/util/distributed_mutex.h 

//  Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.

//  This source code is licensed under both the GPLv2 (found in the

//  COPYING file in the root directory) and Apache 2.0 License

//  (found in the LICENSE.Apache file in the root directory).



#pragma once



#include "rocksdb/rocksdb_namespace.h"



// This file declares a wrapper around the efficient folly DistributedMutex

// that falls back on a standard mutex when not available. See

// https://github.com/facebook/folly/blob/main/folly/synchronization/DistributedMutex.h

// for benefits and limitations.



// At the moment, only scoped locking is supported using DMutexLock

// RAII wrapper, because lock/unlock APIs will vary.



#ifdef USE_FOLLY



#include <folly/synchronization/DistributedMutex.h>



namespace ROCKSDB_NAMESPACE {



class DMutex : public folly::DistributedMutex {

 public:

  static const char* kName() { return "folly::DistributedMutex"; }



  explicit DMutex(bool IGNORED_adaptive = false) { (void)IGNORED_adaptive; }



  // currently no-op

  void AssertHeld() const {}

};

using DMutexLock = std::lock_guard<folly::DistributedMutex>;



}  // namespace ROCKSDB_NAMESPACE



#else



#include <mutex>



#include "port/port.h"



namespace ROCKSDB_NAMESPACE {



using DMutex = port::Mutex;

using DMutexLock = std::lock_guard<DMutex>;



}  // namespace ROCKSDB_NAMESPACE



#endif