mirror of https://github.com/facebook/rocksdb.git
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
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// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include "rocksdb/rocksdb_namespace.h"
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// This file declares a wrapper around the efficient folly DistributedMutex
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// that falls back on a standard mutex when not available. See
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// https://github.com/facebook/folly/blob/main/folly/synchronization/DistributedMutex.h
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// for benefits and limitations.
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// At the moment, only scoped locking is supported using DMutexLock
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// RAII wrapper, because lock/unlock APIs will vary.
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#ifdef USE_FOLLY
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#include <folly/synchronization/DistributedMutex.h>
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namespace ROCKSDB_NAMESPACE {
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class DMutex : public folly::DistributedMutex {
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public:
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static const char* kName() { return "folly::DistributedMutex"; }
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explicit DMutex(bool IGNORED_adaptive = false) { (void)IGNORED_adaptive; }
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// currently no-op
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void AssertHeld() {}
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};
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using DMutexLock = std::lock_guard<folly::DistributedMutex>;
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} // namespace ROCKSDB_NAMESPACE
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#else
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#include "port/port.h"
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namespace ROCKSDB_NAMESPACE {
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using DMutex = port::Mutex;
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using DMutexLock = std::lock_guard<DMutex>;
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} // namespace ROCKSDB_NAMESPACE
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#endif
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