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//
// This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
// project.
//
// Copyright (C) 1998-2024 OpenLink Software
//
// This project 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; only version 2 of the License, dated June 1991.
//
// This program 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 this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
//
//
//
// $Id$
//
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
using System.Threading;
#if ODBC_CLIENT
namespace OpenLink.Data.VirtuosoOdbcClient
#elif CLIENT
namespace OpenLink.Data.VirtuosoClient
#else
namespace OpenLink.Data.Virtuoso
#endif
{
internal sealed class FutureList
{
internal readonly static BooleanSwitch Switch =
new BooleanSwitch ("VirtuosoClient.FutureList", "Marshaling");
internal IDictionary futures = new ListDictionary ();
private bool read_lock = false;
private ManualResetEvent read_event = new ManualResetEvent (true);
internal bool ReadLock ()
{
//return (Interlocked.Exchange (ref read_lock, 1) == 0);
lock (this)
{
if (read_lock)
return false;
read_lock = true;
read_event.Reset ();
return true;
}
}
internal void ReadUnlock ()
{
//Interlocked.Exchange (ref read_lock, 0);
lock (this)
{
read_lock = false;
read_event.Set ();
}
}
internal bool ReadWait (int timeout)
{
return read_event.WaitOne (timeout, false);
}
internal void Add (Future future)
{
Debug.Assert (future != null);
Debug.WriteLineIf (CLI.FnTrace.Enabled, "Futures.Add ()");
lock (futures)
{
futures.Add (future.RequestNo, future);
Debug.WriteLineIf (Switch.Enabled, "add future: " + future.RequestNo);
}
}
internal void Remove (Future future)
{
Debug.Assert (future != null);
Debug.WriteLineIf (CLI.FnTrace.Enabled, "Futures.Remove ()");
lock (futures)
{
futures.Remove (future.RequestNo);
Debug.WriteLineIf (Switch.Enabled, "remove future: " + future.RequestNo);
}
}
internal Future this[int id]
{
get
{
lock (futures)
{
return (Future) futures[id];
}
}
}
internal void Clear ()
{
lock (futures)
{
futures.Clear ();
}
}
}
}
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