2 * Copyright 2017 Facebook, Inc.
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
24 #include <event.h> // libevent
28 # if LIBEVENT_VERSION_NUMBER <= 0x02010101
29 # define FOLLY_LIBEVENT_COMPAT_PLUCK(name) ev_##name
31 # define FOLLY_LIBEVENT_COMPAT_PLUCK(name) ev_evcallback.evcb_##name
33 # define FOLLY_LIBEVENT_DEF_ACCESSORS(name) \
34 inline auto event_ref_##name(struct event* ev) -> \
35 decltype(std::ref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK(name))) \
36 { return std::ref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK(name)); } \
37 inline auto event_ref_##name(struct event const* ev) -> \
38 decltype(std::cref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK(name))) \
39 { return std::cref(ev->FOLLY_LIBEVENT_COMPAT_PLUCK(name)); } \
42 FOLLY_LIBEVENT_DEF_ACCESSORS(flags)
44 # undef FOLLY_LIBEVENT_COMPAT_PLUCK
45 # undef FOLLY_LIBEVENT_DEF_ACCESSORS
48 * low-level libevent utility functions
52 static bool isEventRegistered(const struct event* ev) {
53 // If any of these flags are set, the event is registered.
55 EVLIST_REGISTERED = (EVLIST_INSERTED | EVLIST_ACTIVE |
56 EVLIST_TIMEOUT | EVLIST_SIGNAL)
58 return (event_ref_flags(ev) & EVLIST_REGISTERED);