thin-provisioning-tools/persistent-data/lock_tracker.h

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// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
//
// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools is free software: you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
#ifndef LOCK_TRACKER_H
#define LOCK_TRACKER_H
#include <boost/noncopyable.hpp>
#include <boost/optional.hpp>
#include <map>
#include <stdint.h>
//----------------------------------------------------------------
namespace persistent_data {
class lock_tracker : private boost::noncopyable {
public:
lock_tracker(uint64_t low, uint64_t high);
void read_lock(uint64_t key);
void write_lock(uint64_t key);
void superblock_lock(uint64_t key);
void unlock(uint64_t key);
bool is_locked(uint64_t key) const;
private:
typedef std::map<uint64_t, int> LockMap;
bool found(LockMap::const_iterator it) const;
bool valid_key(uint64_t key) const;
void check_key(uint64_t key) const;
// Positive for read lock, negative for write lock
LockMap locks_;
boost::optional<uint64_t> superblock_;
uint64_t low_;
uint64_t high_;
};
}
//----------------------------------------------------------------
#endif