libcruft-util/thread/semaphore_win32.hpp

48 lines
1.2 KiB
C++
Raw Normal View History

/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright 2018 Danny Robson <danny@nerdcruft.net>
*/
#pragma once
#include "../win32/handle.hpp"
#include <atomic>
namespace cruft::thread {
/// Explicitly does not conform to BasicLockable.
class semaphore {
public:
using value_type = LONG;
semaphore (value_type initial);
semaphore ();
semaphore (const semaphore&) = delete;
semaphore& operator= (const semaphore&) = delete;
semaphore (semaphore&&) = delete;
semaphore& operator= (semaphore&&) = delete;
value_type acquire (void);
value_type acquire (value_type count);
value_type release (void);
value_type release (value_type count);
auto lock (void) { return acquire (); }
auto unlock (void) { return release (); }
value_type value (void) const;
value_type operator++ (void);
value_type operator-- (void);
private:
std::atomic<LONG> m_value;
win32::handle m_handle;
};
};