mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-26 16:30:56 +00:00
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
|
// 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() {}
|
||
|
|
};
|
||
|
|
using DMutexLock = std::lock_guard<folly::DistributedMutex>;
|
||
|
|
|
||
|
|
} // namespace ROCKSDB_NAMESPACE
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
#include "port/port.h"
|
||
|
|
|
||
|
|
namespace ROCKSDB_NAMESPACE {
|
||
|
|
|
||
|
|
using DMutex = port::Mutex;
|
||
|
|
using DMutexLock = std::lock_guard<DMutex>;
|
||
|
|
|
||
|
|
} // namespace ROCKSDB_NAMESPACE
|
||
|
|
|
||
|
|
#endif
|