fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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112 lines
4.3 KiB
112 lines
4.3 KiB
// Copyright (c) Meta Platforms, Inc. and affiliates.
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//
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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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#if defined(USE_COROUTINES)
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#include "folly/experimental/coro/Coroutine.h"
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#include "folly/experimental/coro/Task.h"
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#endif
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#include "rocksdb/rocksdb_namespace.h"
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// This file has two sctions. The first section applies to all instances of
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// header file inclusion and has an include guard. The second section is
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// meant for multiple inclusions in the same source file, and is idempotent.
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namespace ROCKSDB_NAMESPACE {
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#ifndef UTIL_CORO_UTILS_H_
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#define UTIL_CORO_UTILS_H_
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#if defined(USE_COROUTINES)
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// The follwoing macros expand to regular and coroutine function
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// declarations for a given function
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#define DECLARE_SYNC_AND_ASYNC(__ret_type__, __func_name__, ...) \
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__ret_type__ __func_name__(__VA_ARGS__); \
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folly::coro::Task<__ret_type__> __func_name__##Coroutine(__VA_ARGS__);
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#define DECLARE_SYNC_AND_ASYNC_OVERRIDE(__ret_type__, __func_name__, ...) \
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__ret_type__ __func_name__(__VA_ARGS__) override; \
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folly::coro::Task<__ret_type__> __func_name__##Coroutine(__VA_ARGS__) \
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override;
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#define DECLARE_SYNC_AND_ASYNC_CONST(__ret_type__, __func_name__, ...) \
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__ret_type__ __func_name__(__VA_ARGS__) const; \
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folly::coro::Task<__ret_type__> __func_name__##Coroutine(__VA_ARGS__) const;
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constexpr bool using_coroutines() { return true; }
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#else // !USE_COROUTINES
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// The follwoing macros expand to a regular function declaration for a given
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// function
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#define DECLARE_SYNC_AND_ASYNC(__ret_type__, __func_name__, ...) \
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__ret_type__ __func_name__(__VA_ARGS__);
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#define DECLARE_SYNC_AND_ASYNC_OVERRIDE(__ret_type__, __func_name__, ...) \
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__ret_type__ __func_name__(__VA_ARGS__) override;
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#define DECLARE_SYNC_AND_ASYNC_CONST(__ret_type__, __func_name__, ...) \
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__ret_type__ __func_name__(__VA_ARGS__) const;
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constexpr bool using_coroutines() { return false; }
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#endif // USE_COROUTINES
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#endif // UTIL_CORO_UTILS_H_
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// The following section of the file is meant to be included twice in a
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// source file - once defining WITH_COROUTINES and once defining
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// WITHOUT_COROUTINES
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#undef DEFINE_SYNC_AND_ASYNC
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#undef CO_AWAIT
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#undef CO_RETURN
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#if defined(WITH_COROUTINES) && defined(USE_COROUTINES)
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// This macro should be used in the beginning of the function
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// definition. The declaration should have been done using one of the
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// DECLARE_SYNC_AND_ASYNC* macros. It expands to the return type and
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// the function name with the Coroutine suffix. For example -
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// DEFINE_SYNC_AND_ASYNC(int, foo)(bool bar) {}
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// would expand to -
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// folly::coro::Task<int> fooCoroutine(bool bar) {}
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#define DEFINE_SYNC_AND_ASYNC(__ret_type__, __func_name__) \
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folly::coro::Task<__ret_type__> __func_name__##Coroutine
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// This macro should be used to call a function that might be a
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// coroutine. It expands to the correct function name and prefixes
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// the co_await operator if necessary. For example -
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// s = CO_AWAIT(foo)(true);
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// if the code is compiled WITH_COROUTINES, would expand to
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// s = co_await fooCoroutine(true);
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// if compiled WITHOUT_COROUTINES, would expand to
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// s = foo(true);
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#define CO_AWAIT(__func_name__) co_await __func_name__##Coroutine
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#define CO_RETURN co_return
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#elif defined(WITHOUT_COROUTINES)
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// This macro should be used in the beginning of the function
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// definition. The declaration should have been done using one of the
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// DECLARE_SYNC_AND_ASYNC* macros. It expands to the return type and
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// the function name without the Coroutine suffix. For example -
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// DEFINE_SYNC_AND_ASYNC(int, foo)(bool bar) {}
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// would expand to -
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// int foo(bool bar) {}
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#define DEFINE_SYNC_AND_ASYNC(__ret_type__, __func_name__) \
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__ret_type__ __func_name__
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// This macro should be used to call a function that might be a
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// coroutine. It expands to the correct function name and prefixes
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// the co_await operator if necessary. For example -
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// s = CO_AWAIT(foo)(true);
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// if the code is compiled WITH_COROUTINES, would expand to
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// s = co_await fooCoroutine(true);
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// if compiled WITHOUT_COROUTINES, would expand to
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// s = foo(true);
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#define CO_AWAIT(__func_name__) __func_name__
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#define CO_RETURN return
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#endif // DO_NOT_USE_COROUTINES
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} // namespace ROCKSDB_NAMESPACE
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