38b03c840e
Summary: This ports `folly::DistributedMutex` into RocksDB. The PR includes everything else needed to compile and use DistributedMutex as a component within folly. Most files are unchanged except for some portability stuff and includes. For now, I've put this under `rocksdb/third-party`, but if there is a better folder to put this under, let me know. I also am not sure how or where to put unit tests for third-party stuff like this. It seems like gtest is included already, but I need to link with it from another third-party folder. This also includes some other common components from folly - folly/Optional - folly/ScopeGuard (In particular `SCOPE_EXIT`) - folly/synchronization/ParkingLot (A portable futex-like interface) - folly/synchronization/AtomicNotification (The standard C++ interface for futexes) - folly/Indestructible (For singletons that don't get destroyed without allocations) Pull Request resolved: https://github.com/facebook/rocksdb/pull/5642 Differential Revision: D16544439 fbshipit-source-id: 179b98b5dcddc3075926d31a30f92fd064245731
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. 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 <folly/Traits.h>
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#include <utility>
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#include <type_traits>
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namespace folly {
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namespace scope_guard_detail {
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template <typename F>
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class ScopeGuardImpl {
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public:
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explicit ScopeGuardImpl(F&& f) : f_{std::forward<F>(f)} {}
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~ScopeGuardImpl() {
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f_();
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}
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private:
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F f_;
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};
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enum class ScopeGuardEnum {};
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template <typename Func, typename DecayedFunc = _t<std::decay<Func>>>
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ScopeGuardImpl<DecayedFunc> operator+(ScopeGuardEnum, Func&& func) {
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return ScopeGuardImpl<DecayedFunc>{std::forward<Func>(func)};
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}
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} // namespace scope_guard_detail
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} // namespace folly
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/**
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* FB_ANONYMOUS_VARIABLE(str) introduces an identifier starting with
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* str and ending with a number that varies with the line.
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*/
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#ifndef FB_ANONYMOUS_VARIABLE
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#define FB_CONCATENATE_IMPL(s1, s2) s1##s2
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#define FB_CONCATENATE(s1, s2) FB_CONCATENATE_IMPL(s1, s2)
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#ifdef __COUNTER__
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#define FB_ANONYMOUS_VARIABLE(str) \
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FB_CONCATENATE(FB_CONCATENATE(FB_CONCATENATE(str, __COUNTER__), _), __LINE__)
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#else
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#define FB_ANONYMOUS_VARIABLE(str) FB_CONCATENATE(str, __LINE__)
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#endif
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#endif
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#ifndef SCOPE_EXIT
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#define SCOPE_EXIT \
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auto FB_ANONYMOUS_VARIABLE(SCOPE_EXIT_STATE) = \
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::folly::scope_guard_detail::ScopeGuardEnum{} + [&]() noexcept
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#endif
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