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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) 2018 Red Hat
*
* 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.
*
*/
#pragma once
namespace std {
// specialize unique_lock and shared_lock for SharedMutex to operate on
// SharedMutexImpl instead, because the locks may outlive the SharedMutex itself
template <typename Executor>
class unique_lock<ceph::async::SharedMutex<Executor>> {
public:
using mutex_type = boost::intrusive_ptr<ceph::async::detail::SharedMutexImpl>;
unique_lock() = default;
explicit unique_lock(ceph::async::SharedMutex<Executor>& m)
: impl(m.impl), locked(true)
{
impl->lock();
}
unique_lock(ceph::async::SharedMutex<Executor>& m, defer_lock_t t) noexcept
: impl(m.impl)
{}
unique_lock(ceph::async::SharedMutex<Executor>& m, try_to_lock_t t)
: impl(m.impl), locked(impl->try_lock())
{}
unique_lock(ceph::async::SharedMutex<Executor>& m, adopt_lock_t t) noexcept
: impl(m.impl), locked(true)
{}
~unique_lock() {
if (impl && locked)
impl->unlock();
}
unique_lock(unique_lock&& other) noexcept
: impl(std::move(other.impl)),
locked(other.locked) {
other.locked = false;
}
unique_lock& operator=(unique_lock&& other) noexcept {
if (impl && locked) {
impl->unlock();
}
impl = std::move(other.impl);
locked = other.locked;
other.locked = false;
return *this;
}
void swap(unique_lock& other) noexcept {
using std::swap;
swap(impl, other.impl);
swap(locked, other.locked);
}
mutex_type mutex() const noexcept { return impl; }
bool owns_lock() const noexcept { return impl && locked; }
explicit operator bool() const noexcept { return impl && locked; }
mutex_type release() {
auto result = std::move(impl);
locked = false;
return result;
}
void lock() {
if (!impl)
throw system_error(make_error_code(errc::operation_not_permitted));
if (locked)
throw system_error(make_error_code(errc::resource_deadlock_would_occur));
impl->lock();
locked = true;
}
bool try_lock() {
if (!impl)
throw system_error(make_error_code(errc::operation_not_permitted));
if (locked)
throw system_error(make_error_code(errc::resource_deadlock_would_occur));
return locked = impl->try_lock();
}
void unlock() {
if (!impl || !locked)
throw system_error(make_error_code(errc::operation_not_permitted));
impl->unlock();
locked = false;
}
private:
mutex_type impl;
bool locked{false};
};
template <typename Executor>
class shared_lock<ceph::async::SharedMutex<Executor>> {
public:
using mutex_type = boost::intrusive_ptr<ceph::async::detail::SharedMutexImpl>;
shared_lock() = default;
explicit shared_lock(ceph::async::SharedMutex<Executor>& m)
: impl(m.impl), locked(true)
{
impl->lock_shared();
}
shared_lock(ceph::async::SharedMutex<Executor>& m, defer_lock_t t) noexcept
: impl(m.impl)
{}
shared_lock(ceph::async::SharedMutex<Executor>& m, try_to_lock_t t)
: impl(m.impl), locked(impl->try_lock_shared())
{}
shared_lock(ceph::async::SharedMutex<Executor>& m, adopt_lock_t t) noexcept
: impl(m.impl), locked(true)
{}
~shared_lock() {
if (impl && locked)
impl->unlock_shared();
}
shared_lock(shared_lock&& other) noexcept
: impl(std::move(other.impl)),
locked(other.locked) {
other.locked = false;
}
shared_lock& operator=(shared_lock&& other) noexcept {
if (impl && locked) {
impl->unlock_shared();
}
impl = std::move(other.impl);
locked = other.locked;
other.locked = false;
return *this;
}
void swap(shared_lock& other) noexcept {
using std::swap;
swap(impl, other.impl);
swap(locked, other.locked);
}
mutex_type mutex() const noexcept { return impl; }
bool owns_lock() const noexcept { return impl && locked; }
explicit operator bool() const noexcept { return impl && locked; }
mutex_type release() {
auto result = std::move(impl);
locked = false;
return result;
}
void lock() {
if (!impl)
throw system_error(make_error_code(errc::operation_not_permitted));
if (locked)
throw system_error(make_error_code(errc::resource_deadlock_would_occur));
impl->lock_shared();
locked = true;
}
bool try_lock() {
if (!impl)
throw system_error(make_error_code(errc::operation_not_permitted));
if (locked)
throw system_error(make_error_code(errc::resource_deadlock_would_occur));
return locked = impl->try_lock_shared();
}
void unlock() {
if (!impl || !locked)
throw system_error(make_error_code(errc::operation_not_permitted));
impl->unlock_shared();
locked = false;
}
private:
mutex_type impl;
bool locked{false};
};
} // namespace std
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