57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
/************************************************************************
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*
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* Copyright (c) 2020, Alibaba Group Holding Limited
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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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* http://www.apache.org/licenses/LICENSE-2.0
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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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* $Id: event.h,v 1.0 12/25/2017 04:36:36 PM
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*
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************************************************************************/
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/**
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* @file event.h
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* @date 12/25/2017 04:36:36 PM
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* @version 1.0
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* @brief
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*
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**/
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#pragma once
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#include <semaphore.h>
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#include <atomic>
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#include "common.h"
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namespace xengine {
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namespace util {
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class Event {
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public:
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Event() { sem_init(&sem_, 0, 0); }
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void post() { sem_post(&sem_); };
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void wait() { sem_wait(&sem_); }
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int timed_wait(Duration _dur) {
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struct timespec ts;
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clock_gettime(CLOCK_REALTIME, &ts);
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uint64_t to_ms = _dur.count();
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auto old_nsec = ts.tv_nsec;
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ts.tv_nsec = (ts.tv_nsec + (to_ms % 1000) * 1000000) % 1000000000;
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ts.tv_sec = ts.tv_sec + to_ms / 1000 + (old_nsec > ts.tv_nsec ? 1 : 0);
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return sem_timedwait(&sem_, &ts);
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}
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private:
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enum State { INIT = 0, WAITING = 1, TIMEOUT = 2 };
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std::atomic<State> state_{INIT};
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sem_t sem_;
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};
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} // namespace is
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}
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