47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
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/*
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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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#pragma once
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#include <atomic>
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#include <condition_variable>
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#include <mutex>
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namespace cruft::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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std::mutex m_mutex;
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std::condition_variable m_cv;
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};
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};
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