63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// bthread - A M:N threading library to make applications more concurrent.
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// Date: 2016/06/03 13:06:40
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#ifndef BTHREAD_COUNTDOWN_EVENT_H
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#define BTHREAD_COUNTDOWN_EVENT_H
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#include "bthread/bthread.h"
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namespace bthread {
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// A synchronization primitive to wait for multiple signallers.
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class CountdownEvent {
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public:
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CountdownEvent(int initial_count = 1);
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~CountdownEvent();
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// Increase current counter by |v|
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void add_count(int v = 1);
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// Reset the counter to |v|
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void reset(int v = 1);
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// Decrease the counter by |sig|
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// when flush is true, after signal we need to call bthread_flush
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void signal(int sig = 1, bool flush = false);
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// Block current thread until the counter reaches 0.
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// Returns 0 on success, error code otherwise.
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// This method never returns EINTR.
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int wait();
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// Block the current thread until the counter reaches 0 or duetime has expired
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// Returns 0 on success, error code otherwise. ETIMEDOUT is for timeout.
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// This method never returns EINTR.
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int timed_wait(const timespec& duetime);
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private:
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int *_butex;
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bool _wait_was_invoked;
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};
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} // namespace bthread
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#endif // BTHREAD_COUNTDOWN_EVENT_H
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