36 lines
854 B
C++
36 lines
854 B
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_UTIL_THREAD_FLAG_HPP
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#define CRUFT_UTIL_THREAD_FLAG_HPP
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#include <atomic>
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namespace cruft::thread {
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/// a fire-once event that users can wait upon. if already fired then
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/// waiting will be a noop.
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class flag {
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public:
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flag ();
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/// blocks indefinitely until the flag has been set.
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void wait (void);
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/// wake all the threads waiting on the flag
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void notify_one (void);
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/// wake all threads waiting on the flag
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void notify_all (void);
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private:
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std::atomic<int> value;
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};
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};
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#endif
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