79 lines
2.9 KiB
C
79 lines
2.9 KiB
C
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <functional>
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#include <folly/portability/Event.h>
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namespace folly {
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#if LIBEVENT_VERSION_NUMBER <= 0x02010101
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#define FOLLY_LIBEVENT_COMPAT_PLUCK(name) ev_##name
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#define FOLLY_LIBEVENT_COMPAT_PLUCK2(name) ev_##name
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#else
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#define FOLLY_LIBEVENT_COMPAT_PLUCK(name) ev_evcallback.evcb_##name
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#define FOLLY_LIBEVENT_COMPAT_PLUCK2(name) \
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ev_evcallback.evcb_cb_union.evcb_##name
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#endif
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#define FOLLY_LIBEVENT_DEF_ACCESSORS(name) \
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inline auto event_ref_##name(struct event* ev) \
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->decltype(std::ref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK(name))) { \
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return std::ref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK(name)); \
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} \
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inline auto event_ref_##name(struct event const* ev) \
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->decltype(std::cref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK(name))) { \
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return std::cref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK(name)); \
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} \
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//
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#define FOLLY_LIBEVENT_DEF_ACCESSORS2(name) \
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inline auto event_ref_##name(struct event* ev) \
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->decltype(std::ref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK2(name))) { \
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return std::ref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK2(name)); \
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} \
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inline auto event_ref_##name(struct event const* ev) \
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->decltype(std::cref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK2(name))) { \
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return std::cref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK2(name)); \
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} \
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//
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FOLLY_LIBEVENT_DEF_ACCESSORS(arg)
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FOLLY_LIBEVENT_DEF_ACCESSORS(flags)
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// evcb_callback is inside a union{...} evcb_cb_union
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FOLLY_LIBEVENT_DEF_ACCESSORS2(callback)
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#undef FOLLY_LIBEVENT_COMPAT_PLUCK
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#undef FOLLY_LIBEVENT_DEF_ACCESSORS
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/**
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* low-level libevent utility functions
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*/
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class EventUtil {
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public:
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static bool isEventRegistered(const struct event* ev) {
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// If any of these flags are set, the event is registered.
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enum {
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EVLIST_REGISTERED =
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(EVLIST_INSERTED | EVLIST_ACTIVE | EVLIST_TIMEOUT | EVLIST_SIGNAL)
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};
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return (event_ref_flags(ev) & EVLIST_REGISTERED);
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}
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};
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} // namespace folly
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