62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
// 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
|