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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) 2020 Red Hat
* Author: Adam C. Emerson <aemerson@redhat.com>
*
* 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.
*
*/
#ifndef CEPH_COMMON_ASYNC_LIBRADOS_COMPLETION_H
#define CEPH_COMMON_ASYNC_LIBRADOS_COMPLETION_H
#include <atomic>
#include <condition_variable>
#include <mutex>
#include <optional>
#include <type_traits>
#include <boost/asio/async_result.hpp>
#include <boost/system/error_code.hpp>
#include <boost/system/system_error.hpp>
#include "include/rados/librados.hpp"
#include "librados/AioCompletionImpl.h"
// Allow librados::AioCompletion to be provided as a completion
// handler. This is only allowed with a signature of
// (boost::system::error_code) or (). On completion the AioCompletion
// is completed with the error_code converted to an int with
// ceph::from_error_code.
//
// async_result::return_type is void.
namespace ceph::async {
namespace bs = boost::system;
namespace lr = librados;
namespace detail {
struct librados_handler {
lr::AioCompletionImpl* pc;
explicit librados_handler(lr::AioCompletion* c) : pc(c->pc) {
pc->get();
}
~librados_handler() {
if (pc) {
pc->put();
pc = nullptr;
}
}
librados_handler(const librados_handler&) = delete;
librados_handler& operator =(const librados_handler&) = delete;
librados_handler(librados_handler&& rhs) {
pc = rhs.pc;
rhs.pc = nullptr;
}
void operator()(bs::error_code ec) {
pc->lock.lock();
pc->rval = ceph::from_error_code(ec);
pc->complete = true;
pc->lock.unlock();
auto cb_complete = pc->callback_complete;
auto cb_complete_arg = pc->callback_complete_arg;
if (cb_complete)
cb_complete(pc, cb_complete_arg);
auto cb_safe = pc->callback_safe;
auto cb_safe_arg = pc->callback_safe_arg;
if (cb_safe)
cb_safe(pc, cb_safe_arg);
pc->lock.lock();
pc->callback_complete = NULL;
pc->callback_safe = NULL;
pc->cond.notify_all();
pc->put_unlock();
pc = nullptr;
}
void operator ()() {
(*this)(bs::error_code{});
}
};
} // namespace detail
} // namespace ceph::async
namespace boost::asio {
template<typename ReturnType>
class async_result<librados::AioCompletion*, ReturnType()> {
public:
using completion_handler_type = ceph::async::detail::librados_handler;
explicit async_result(completion_handler_type&) {};
using return_type = void;
void get() {
return;
}
};
template<typename ReturnType>
class async_result<librados::AioCompletion*,
ReturnType(boost::system::error_code)> {
public:
using completion_handler_type = ceph::async::detail::librados_handler;
explicit async_result(completion_handler_type&) {};
using return_type = void;
void get() {
return;
}
};
}
#endif // !CEPH_COMMON_ASYNC_LIBRADOS_COMPLETION_H
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