1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/libfsclient/include/fsclient/notifier.h Tue Jul 06 00:45:25 2021 +0200
1.3 @@ -0,0 +1,79 @@
1.4 +/*
1.5 + * File event notification support.
1.6 + *
1.7 + * Copyright (C) 2021 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 +#pragma once
1.26 +
1.27 +#include <condition_variable>
1.28 +#include <list>
1.29 +#include <mutex>
1.30 +
1.31 +#include <fsclient/file.h>
1.32 +#include <ipc/server.h>
1.33 +#include <systypes/base.h>
1.34 +
1.35 +
1.36 +
1.37 +/* An object for monitoring file event notifications. */
1.38 +
1.39 +class FileNotifier
1.40 +{
1.41 +protected:
1.42 + std::list<file_t *> _affected;
1.43 + l4_cap_idx_t _thread = L4_INVALID_CAP;
1.44 + bool _started = false;
1.45 +
1.46 + std::mutex _lock;
1.47 + std::condition_variable _notified;
1.48 +
1.49 + /* Helper methods. */
1.50 +
1.51 + virtual void _notify(file_t *file, notify_flags_t flags);
1.52 +
1.53 +public:
1.54 + /* Server details. */
1.55 +
1.56 + int expected_items();
1.57 +
1.58 + ipc_server_handler_type handler();
1.59 +
1.60 + void *interface()
1.61 + { return static_cast<FileNotifier *>(this); }
1.62 +
1.63 + /* Local operations. */
1.64 +
1.65 + virtual long subscribe(file_t *file, notify_flags_t flags);
1.66 +
1.67 + virtual long unsubscribe(file_t *file);
1.68 +
1.69 + virtual void mainloop();
1.70 +
1.71 + virtual long start();
1.72 +
1.73 + virtual long wait(file_t **file);
1.74 +};
1.75 +
1.76 +
1.77 +
1.78 +/* Helper functions. */
1.79 +
1.80 +FileNotifier *get_notifier();
1.81 +
1.82 +// vim: tabstop=4 expandtab shiftwidth=4