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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2017 SUSE LINUX GmbH
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
* @author Jesse Williamson <jwilliamson@suse.de>
*
*/
#ifndef CEPH_SPINLOCK_HPP
#define CEPH_SPINLOCK_HPP
#include <atomic>
namespace ceph {
inline namespace version_1_0 {
class spinlock;
inline void spin_lock(std::atomic_flag& lock);
inline void spin_unlock(std::atomic_flag& lock);
inline void spin_lock(ceph::spinlock& lock);
inline void spin_unlock(ceph::spinlock& lock);
/* A pre-packaged spinlock type modelling BasicLockable: */
class spinlock final
{
std::atomic_flag af = ATOMIC_FLAG_INIT;
public:
void lock() {
ceph::spin_lock(af);
}
void unlock() noexcept {
ceph::spin_unlock(af);
}
};
// Free functions:
inline void spin_lock(std::atomic_flag& lock)
{
while(lock.test_and_set(std::memory_order_acquire))
;
}
inline void spin_unlock(std::atomic_flag& lock)
{
lock.clear(std::memory_order_release);
}
inline void spin_lock(std::atomic_flag *lock)
{
spin_lock(*lock);
}
inline void spin_unlock(std::atomic_flag *lock)
{
spin_unlock(*lock);
}
inline void spin_lock(ceph::spinlock& lock)
{
lock.lock();
}
inline void spin_unlock(ceph::spinlock& lock)
{
lock.unlock();
}
inline void spin_lock(ceph::spinlock *lock)
{
spin_lock(*lock);
}
inline void spin_unlock(ceph::spinlock *lock)
{
spin_unlock(*lock);
}
} // inline namespace (version)
} // namespace ceph
#endif
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