53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
/*
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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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*
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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, 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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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_UTIL_THREAD_SEMAPHORE_HPP
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#define CRUFT_UTIL_THREAD_SEMAPHORE_HPP
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#include <atomic>
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namespace util::thread {
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/// Explicitly does not conform to BasicLockable.
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class semaphore {
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public:
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semaphore (int initial);
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semaphore ();
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semaphore (const semaphore&) = delete;
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semaphore& operator= (const semaphore&) = delete;
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semaphore (semaphore&&) = delete;
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semaphore& operator= (semaphore&&) = delete;
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int acquire (void);
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int acquire (int count);
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int release (void);
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int release (int count);
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auto lock (void) { return acquire (); }
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auto unlock (void) { return release (); }
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int value (void) const;
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int operator++ (void);
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int operator-- (void);
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private:
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std::atomic<int> m_value;
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};
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};
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#endif
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