libevent.hpp

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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License

#ifndef __LIBEVENT_HPP__
#define __LIBEVENT_HPP__

#include <event2/event.h>

#include <stout/lambda.hpp>

namespace process {

// Event loop.
extern event_base* base;


// Per thread bool pointer. We use a pointer to lazily construct the
// actual bool.
extern thread_local bool* _in_event_loop_;


#define __in_event_loop__ *(_in_event_loop_ == nullptr ?                \
  _in_event_loop_ = new bool(false) : _in_event_loop_)


enum EventLoopLogicFlow
{
  ALLOW_SHORT_CIRCUIT,
  DISALLOW_SHORT_CIRCUIT
};


void run_in_event_loop(
    const lambda::function<void()>& f,
    EventLoopLogicFlow event_loop_logic_flow = ALLOW_SHORT_CIRCUIT);

} // namespace process {

#endif // __LIBEVENT_HPP__