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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2009 Oracle. All rights reserved.
*
*/
using System;
using System.Collections.Generic;
using System.Text;
using BerkeleyDB.Internal;
namespace BerkeleyDB {
/// <summary>
/// A class representing the locking options for Berkeley DB operations.
/// </summary>
public class LockingInfo {
/// <summary>
/// The isolation degree of the operation.
/// </summary>
public Isolation IsolationDegree;
/// <summary>
/// If true, acquire write locks instead of read locks when doing a
/// read, if locking is configured.
/// </summary>
/// <remarks>
/// Setting ReadModifyWrite can eliminate deadlock during a
/// read-modify-write cycle by acquiring the write lock during the read
/// part of the cycle so that another thread of control acquiring a read
/// lock for the same item, in its own read-modify-write cycle, will not
/// result in deadlock.
/// </remarks>
public bool ReadModifyWrite;
/// <summary>
/// Instantiate a new LockingInfo object
/// </summary>
public LockingInfo() {
IsolationDegree = Isolation.DEGREE_THREE;
ReadModifyWrite = false;
}
internal uint flags {
get {
uint ret = 0;
switch (IsolationDegree) {
case (Isolation.DEGREE_ONE):
ret |= DbConstants.DB_READ_UNCOMMITTED;
break;
case (Isolation.DEGREE_TWO):
ret |= DbConstants.DB_READ_COMMITTED;
break;
}
if (ReadModifyWrite)
ret |= DbConstants.DB_RMW;
return ret;
}
}
}
}
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