1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/libfsserver/lib/pages/page_queue_common.cc Sun May 29 00:31:29 2022 +0200
1.3 @@ -0,0 +1,48 @@
1.4 +/*
1.5 + * Common page queue functionality.
1.6 + *
1.7 + * Copyright (C) 2021, 2022 Paul Boddie <paul@boddie.org.uk>
1.8 + *
1.9 + * This program is free software; you can redistribute it and/or
1.10 + * modify it under the terms of the GNU General Public License as
1.11 + * published by the Free Software Foundation; either version 2 of
1.12 + * the License, or (at your option) any later version.
1.13 + *
1.14 + * This program is distributed in the hope that it will be useful,
1.15 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.16 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.17 + * GNU General Public License for more details.
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License
1.20 + * along with this program; if not, write to the Free Software
1.21 + * Foundation, Inc., 51 Franklin Street, Fifth Floor,
1.22 + * Boston, MA 02110-1301, USA
1.23 + */
1.24 +
1.25 +#include "page_queue_common.h"
1.26 +
1.27 +
1.28 +
1.29 +bool PageQueueCommon::remove(Queue &queue, Positions &positions, PageOwner *owner, Flexpage *flexpage)
1.30 +{
1.31 + Positions::iterator position = positions.find(flexpage);
1.32 +
1.33 + if (position == positions.end())
1.34 + return false;
1.35 +
1.36 + /* The found owner may be different from the requesting owner or even NULL
1.37 + if another owner has acquired and then purged its pages. Such a purged
1.38 + flexpage is not immediately usable, however. */
1.39 +
1.40 + Queue::iterator entry = position->second;
1.41 +
1.42 + if ((entry->owner == NULL) || (entry->owner != owner))
1.43 + return false;
1.44 +
1.45 + queue.erase(entry);
1.46 + positions.erase(position);
1.47 +
1.48 + return true;
1.49 +}
1.50 +
1.51 +// vim: tabstop=4 expandtab shiftwidth=4